This page has only limited features, please log in for full access.

Unclaimed
J.M. García-Oliver
CMT – Motores Térmicos, Universitat Politècnica de València, Valencia, Spain

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Research article
Published: 07 July 2021 in International Journal of Engine Research
Reads 0
Downloads 0

The decarbonization process of the automotive industry and the road transport sector has raised the interest on the development of cleaner fuels. A proper characterization of their properties and behavior under different operating conditions is mandatory to achieve an effective implementation in commercial engines. With this objective, the current work presents a comparison of two injectors from the Engine Combustion Network (ECN), namely Spray A and Spray D injectors, in terms of spray characteristics and combustion behavior for different fuels: diesel, dodecane, Hydrotreated Vegetable Oil (HVO), and two types of oxymethylene ethers (OME1 and OME x). The aim is to analyze how differences in nozzle geometry affect the behavior of different types of fuels. The experiments were carried out in a High Temperature and High Pressure test rig and operating conditions were chosen following ECN guidelines. Visualization techniques such as high speed schlieren imaging, OH* chemiluminescence and diffused back illumination were implemented to analyze the differences in liquid length, vapor penetration, auto ignition, flame lift-off length, and soot formation for both nozzles. In general, results showed the same trend for all the fuels tested: longer liquid length and faster vapor penetration for Spray D, as well as higher ignition delay and longer lift-off length. However, it was found that these parameters were less sensitive to the nozzle diameter for the oxygenated fuels tested. Furthermore, a different trend was observed for OME1, in terms of ignition behavior, in comparison to the other fuels. In terms of soot production, the Spray D nozzle increases its formation with the non-oxygenated fuels. In contrast, no soot was observed with the oxygenated ones under any operating conditions.

ACS Style

José V Pastor; José M García-Oliver; Carlos Micó; Alba A García-Carrero. An experimental study with renewable fuels using ECN Spray A and D nozzles. International Journal of Engine Research 2021, 1 .

AMA Style

José V Pastor, José M García-Oliver, Carlos Micó, Alba A García-Carrero. An experimental study with renewable fuels using ECN Spray A and D nozzles. International Journal of Engine Research. 2021; ():1.

Chicago/Turabian Style

José V Pastor; José M García-Oliver; Carlos Micó; Alba A García-Carrero. 2021. "An experimental study with renewable fuels using ECN Spray A and D nozzles." International Journal of Engine Research , no. : 1.

Journal article
Published: 19 May 2021 in Combustion and Flame
Reads 0
Downloads 0

Soot production (including formation and oxidation) is studied in the transient, high-pressure and turbulent n-dodecane Spray A flames from the Engine Combustion Network (ECN) using computational fluid dynamics (CFD) simulations. A two-equation soot-in-flamelet modeling approach is applied within the framework of the Unsteady Flamelet Progress Variable (UFPV) model and results are validated against experimental data. Equations for soot mass fraction and soot number density derived in the mixture fraction space are solved in the context of detailed flamelet calculations. Source terms for the different steps in the soot chemistry are tabulated and incorporated in the flamelet manifold. For the reference condition, the modeling approach based on the tabulated flamelet manifold reduces the computational cost of a CFD calculation by approximately 40 times compared to a non-tabulated well-mixed (WM) modeling approach. The soot-in-flamelet approach is then extended to study the effect of ambient oxygen concentration, ambient mixture composition and ambient temperature on soot production. Results show that the modeling approach is able to capture the experimental trends for the soot volume fraction (SVF) with good quantitative agreement, especially in the soot ramp-up region.

ACS Style

Leonardo Pachano; Chao Xu; Jose M. García-Oliver; Jose M. Pastor; Ricardo Novella; Prithwish Kundu. A two-equation soot-in-flamelet modeling approach applied under Spray A conditions. Combustion and Flame 2021, 231, 111488 .

AMA Style

Leonardo Pachano, Chao Xu, Jose M. García-Oliver, Jose M. Pastor, Ricardo Novella, Prithwish Kundu. A two-equation soot-in-flamelet modeling approach applied under Spray A conditions. Combustion and Flame. 2021; 231 ():111488.

Chicago/Turabian Style

Leonardo Pachano; Chao Xu; Jose M. García-Oliver; Jose M. Pastor; Ricardo Novella; Prithwish Kundu. 2021. "A two-equation soot-in-flamelet modeling approach applied under Spray A conditions." Combustion and Flame 231, no. : 111488.

Journal article
Published: 03 May 2021 in Fuel
Reads 0
Downloads 0

Experimental results from a study on the evolution of gas jets ejected through the orifices of a pre-chamber in a heavy-duty optical engine are presented. The work examines conditions without fuel inside the main-chamber, which helps to describe the dynamics of the ejected gas jets without the interference of subsequent combustion in the main-chamber. Experimental diagnostics consist of high-speed visible intensified imaging and low-speed infrared imaging. Additionally a one-dimensional gas jet model is used to characterize the spatial distribution of the ejected flow, including parameters such as tip penetration, which are then validated based on experimental results. Different stages in the ejection of pre-chamber jets are identified, with chemical activity restricted to a maximum distance of 5 to 10 orifice diameters downstream of the orifice as indicated by the recorded visible radiation. Sensitivity of cycle-to-cycle variations in pre-chamber jet development to the air-to-fuel ratio in the pre-chamber observed in the experiments is in most part attributed to the variations in the timing of combustion initiation in the pre-chamber. The influence of the ejection flow on the penetration of the gas jet on a cycle-to-cycle basis is presented using the one-dimensional model. The one-dimensional model also indicates that the local flow exhibits highest sensitivity to operating conditions during the start of ejection until the timing when maximum flow is attained. Differences that exist during the decreasing mass-flow ejection time-period tend to smear out in part due to the transient slowdown of the ejection process.

ACS Style

J.M. García-Oliver; Y. Niki; R. Rajasegar; R. Novella; J. Gomez-Soriano; P.J. Martínez-Hernándiz; Z. Li; M.P.B. Musculus. An experimental and one-dimensional modeling analysis of turbulent gas ejection in pre-chamber engines. Fuel 2021, 299, 120861 .

AMA Style

J.M. García-Oliver, Y. Niki, R. Rajasegar, R. Novella, J. Gomez-Soriano, P.J. Martínez-Hernándiz, Z. Li, M.P.B. Musculus. An experimental and one-dimensional modeling analysis of turbulent gas ejection in pre-chamber engines. Fuel. 2021; 299 ():120861.

Chicago/Turabian Style

J.M. García-Oliver; Y. Niki; R. Rajasegar; R. Novella; J. Gomez-Soriano; P.J. Martínez-Hernándiz; Z. Li; M.P.B. Musculus. 2021. "An experimental and one-dimensional modeling analysis of turbulent gas ejection in pre-chamber engines." Fuel 299, no. : 120861.

Research article
Published: 29 April 2021 in International Journal of Engine Research
Reads 0
Downloads 0

Low-speed pre-ignition (LSPI) remains one of the challenges of Direct Injection (DI) Spark Ignition (SI) engines due to its potential to induce a heavy knock. Several mechanisms have been identified in the literature as plausible causes for LSPI. The physical and chemical properties of lubricant oils play a role on some of these causes. The present work aims at getting an independent procedure to determine the proneness of lubricant oils to ignite. To this end, the ignition delay (ID) of different oil formulations is experimentally determined in a constant-pressure flow facility through two different optical techniques: Schlieren and OH* chemiluminescence imaging. The investigation explores the effect of base-stock formulation, oil specification quality level, different additive types content, aging, and oxidation on oil reactivity for several thermodynamic conditions. Differences in ignition delay were found among base stocks, correlating with the American Petroleum Institute (API) group classification. However, no significant differences were found among additive packages previously reported to yield different LSPI occurrences. Hence, differences in reactivity among lubricating oil formulations are not the determining factor explaining their different LSPI occurrences in an engine. Similarly, specific lubricant additive content, aging, and oxidation do not importantly modify the measured ignition delay.

ACS Style

Bernardo Tormos; José M García-Oliver; Marcos Carreres; Carlos Moreno-Montagud; Beatriz Domínguez; María Dolores Cárdenas; Fermín Oliva. Experimental assessment of ignition characteristics of lubricating oil sprays related to low-speed pre-ignition (LSPI). International Journal of Engine Research 2021, 1 .

AMA Style

Bernardo Tormos, José M García-Oliver, Marcos Carreres, Carlos Moreno-Montagud, Beatriz Domínguez, María Dolores Cárdenas, Fermín Oliva. Experimental assessment of ignition characteristics of lubricating oil sprays related to low-speed pre-ignition (LSPI). International Journal of Engine Research. 2021; ():1.

Chicago/Turabian Style

Bernardo Tormos; José M García-Oliver; Marcos Carreres; Carlos Moreno-Montagud; Beatriz Domínguez; María Dolores Cárdenas; Fermín Oliva. 2021. "Experimental assessment of ignition characteristics of lubricating oil sprays related to low-speed pre-ignition (LSPI)." International Journal of Engine Research , no. : 1.

Research article
Published: 29 December 2020 in International Journal of Engine Research
Reads 0
Downloads 0

Dual-fuel (DF) engines, in which premixed natural gas and air in an open-type combustion chamber is ignited by diesel-fuel pilot sprays, have been more popular for marine use than pre-chamber spark ignition (PCSI) engines because of their superior durability. However, control of ignition and combustion in DF engines is more difficult than in PCSI engines. In this context, this study focuses on the ignition stability of n-heptane pilot-fuel jets injected into a compressed premixed charge of natural gas and air at low-load conditions. To aid understanding of the experimental data, chemical-kinetics simulations were carried out in a simplified engine-environment that provided insight into the chemical effects of methane (CH4) on pilot-fuel ignition. The simulations reveal that CH4 has an effect on both stages of n-heptane autoignition: the small, first-stage, cool-flame-type, low-temperature ignition (LTI) and the larger, second-stage, high-temperature ignition (HTI). As the ratio of pilot-fuel to CH4 entrained into the spray decreases, the initial oxidization of CH4 consumes the OH radicals produced by pilot-fuel decomposition during LTI, thereby inhibiting its progression to HTI. Using imaging diagnostics, the spatial and temporal progression of LTI and HTI in DF combustion are measured in a heavy-duty optical engine, and the imaging data are analyzed to understand the cause of severe fluctuations in ignition timing and combustion completeness at low-load conditions. Images of cool-flame and hydroxyl radical (OH*) chemiluminescence serve as indicators of LTI and HTI, respectively. The cycle-to-cycle and spatial variation in ignition extracted from the imaging data are used as key metrics of comparison. The imaging data indicate that the local concentration of the pilot-fuel and the richness of the surrounding natural-gas air mixture are important for LTI and HTI, but in different ways. In particular, higher injection pressures and shorter injection durations increase the mixing rate, leading to lower concentrations of pilot-fuel more quickly, which can inhibit HTI even as LTI remains relatively robust. Decreasing the injection pressure from 80 MPa to 40 MPa and increasing the injection duration from 500 µs to 760 µs maintained constant pilot-fuel mass, while promoting robust transition from LTI to HTI by effectively slowing the mixing rate. This allows enough residence time for the OH radicals, produced by the two-stage ignition chemistry of the pilot-fuel, to accelerate the transition from LTI to HTI before being consumed by CH4 oxidation. Thus from a practical perspective, for a premixed natural gas fuel–air equivalence-ratio, it is possible to improve the “stability” of the combustion process by solely manipulating the pilot-fuel injection parameters while maintaining constant mass of injected pilot-fuel. This allows for tailoring mixing trajectories to offset changes in fuel ignition chemistry, so as to promote a robust transition from LTI to HTI by changing the balance between the local concentration of the pilot-fuel and richness of the premixed natural gas and air. This could prove to be a valuable tool for combustion design to improve fuel efficiency or reduce noise or perhaps even reduce heat-transfer losses by locating early combustion away from in-cylinder walls.

ACS Style

Yoichi Niki; Rajavasanth Rajasegar; Zheming Li; Mark Pb Musculus; Jose Maria Garcia Oliver; Koji Takasaki. Verification of diesel spray ignition phenomenon in dual-fuel diesel-piloted premixed natural gas engine. International Journal of Engine Research 2020, 1 .

AMA Style

Yoichi Niki, Rajavasanth Rajasegar, Zheming Li, Mark Pb Musculus, Jose Maria Garcia Oliver, Koji Takasaki. Verification of diesel spray ignition phenomenon in dual-fuel diesel-piloted premixed natural gas engine. International Journal of Engine Research. 2020; ():1.

Chicago/Turabian Style

Yoichi Niki; Rajavasanth Rajasegar; Zheming Li; Mark Pb Musculus; Jose Maria Garcia Oliver; Koji Takasaki. 2020. "Verification of diesel spray ignition phenomenon in dual-fuel diesel-piloted premixed natural gas engine." International Journal of Engine Research , no. : 1.

Journal article
Published: 07 October 2020 in Transportation Engineering
Reads 0
Downloads 0

The combustion process of the Engine Combustion Network (ECN) Spray A and Spray D is studied over a wide range of ambient temperatures from 750 K to 900 K. With nominal diameters of 89.4 μm for the Spray A and 190.3 μm for the Spray D, these n-dodecane sprays are representative for light- and heavy-duty compression ignition engine applications, respectively. Computational Fluid Dynamics calculations are carried out using a Lagrangian parcel Eulerian fluid approach in a Reynolds averaged Navier-Stokes framework. For the Spray D reference condition, two sub-grid flame structure assumptions and the effect of turbulence chemistry interaction (TCI) on autoignition and flame structure at quasi-steady state are assessed in the context of a well-mixed and an Unsteady Flamelet Progress Variable (UFPV) combustion model. After that, UFPV approach is used to evaluate combustion behavior for the different ambient temperature conditions. Reference condition results show that both well-mixed and flamelet assumptions lead to a similar autoignition sequence. In terms of ignition delay time, TCI plays an important role, within the UFPV model, in reproducing the experimental trend observed for the increase in nozzle diameter. In terms of lift-off length, the well-mixed model is observed to predict a longer value compared to the flamelet-based sub-grid assumption. Lastly, the analysis of the autoignition sequence and flame structure at quasi-steady state is also extended over the whole range of ambient temperature conditions.

ACS Style

J.M. García-Oliver; R. Novella; J.M. Pastor; L. Pachano. Computational study of ECN Spray A and Spray D combustion at different ambient temperature conditions. Transportation Engineering 2020, 2, 100027 .

AMA Style

J.M. García-Oliver, R. Novella, J.M. Pastor, L. Pachano. Computational study of ECN Spray A and Spray D combustion at different ambient temperature conditions. Transportation Engineering. 2020; 2 ():100027.

Chicago/Turabian Style

J.M. García-Oliver; R. Novella; J.M. Pastor; L. Pachano. 2020. "Computational study of ECN Spray A and Spray D combustion at different ambient temperature conditions." Transportation Engineering 2, no. : 100027.

Journal article
Published: 07 August 2020 in Applied Sciences
Reads 0
Downloads 0

The stringent emission regulations have motivated the development of cleaner fuels as diesel surrogates. However, their different physical-chemical properties make the study of their behavior in compression ignition engines essential. In this sense, optical techniques are a very effective tool for determining the spray evolution and combustion characteristics occurring in the combustion chamber. In this work, quantitative parameters describing the evolution of diesel-like sprays such as liquid length, spray penetration, ignition delay, lift-off length and flame penetration as well as the soot formation were tested in a constant high pressure and high temperature installation using schlieren, OH∗ chemiluminescence and diffused back-illumination extinction imaging techniques. Boundary conditions such as rail pressure, chamber density and temperature were defined using guidelines from the Engine Combustion Network (ECN). Two paraffinic fuels (dodecane and a renewable hydrotreated vegetable oil (HVO)) and two oxygenated fuels (methylal identified as OME1 and a blend of oxymethylene ethers, identified as OMEx) were tested and compared to a conventional diesel fuel used as reference. Results showed that paraffinic fuels and OMEx sprays have similar behavior in terms of global combustion metrics. In the case of OME1, a shorter liquid length, but longer ignition delay time and flame lift-off length were observed. However, in terms of soot formation, a big difference between paraffinic and oxygenated fuels could be appreciated. While paraffinic fuels did not show any significant decrease of soot formation when compared to diesel fuel, soot formed by OME1 and OMEx was below the detection threshold in all tested conditions.

ACS Style

José V. Pastor; José M. García-Oliver; Carlos Micó; Alba A. García-Carrero; Arantzazu Gómez. Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions. Applied Sciences 2020, 10, 5460 .

AMA Style

José V. Pastor, José M. García-Oliver, Carlos Micó, Alba A. García-Carrero, Arantzazu Gómez. Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions. Applied Sciences. 2020; 10 (16):5460.

Chicago/Turabian Style

José V. Pastor; José M. García-Oliver; Carlos Micó; Alba A. García-Carrero; Arantzazu Gómez. 2020. "Experimental Study of the Effect of Hydrotreated Vegetable Oil and Oxymethylene Ethers on Main Spray and Combustion Characteristics under Engine Combustion Network Spray A Conditions." Applied Sciences 10, no. 16: 5460.

Journal article
Published: 07 July 2020 in Energies
Reads 0
Downloads 0

Multiple injection strategies have increased their capabilities along with the evolution of injection system technologies up to the point that nowadays it is possible to inject eight different pulses, permitting to improve the engine performance, and consequently, emissions. The present work was realized for two simplified strategies: a pilot-main and a main-post, in order to analyze the influence of an auxiliary pulse on the main and otherwise, in reactive conditions for two pilot/post quantities and four hydraulic dwell times. The study was carried out by employing two optical techniques: diffused back-illumination with flame bandpass chemiluminescence for measuring soot, represented by soot-maps distribution, and single-pass schlieren for ignition delay (ID). Furthermore, a novel methodology for decoupling the start of combustion (SOC) of the second pulse was developed and successfully validated. From the ignition delay results, it was found for all test points that the pilot injection enhanced conditions, which promote a faster ignition of the main pulse, also at higher chamber temperatures, all conditions presented a separate combustion event for each injection. In emission terms, soot increased in the pilot-main strategies compared to its single injection case, as well as, in conditions that promote faster-premixed combustion.

ACS Style

Raul Payri; José M. García-Oliver; Victor Mendoza; Alberto Viera. Analysis of the Influence of Diesel Spray Injection on the Ignition and Soot Formation in Multiple Injection Strategy. Energies 2020, 13, 3505 .

AMA Style

Raul Payri, José M. García-Oliver, Victor Mendoza, Alberto Viera. Analysis of the Influence of Diesel Spray Injection on the Ignition and Soot Formation in Multiple Injection Strategy. Energies. 2020; 13 (13):3505.

Chicago/Turabian Style

Raul Payri; José M. García-Oliver; Victor Mendoza; Alberto Viera. 2020. "Analysis of the Influence of Diesel Spray Injection on the Ignition and Soot Formation in Multiple Injection Strategy." Energies 13, no. 13: 3505.

Journal article
Published: 28 June 2020 in Journal of Cleaner Production
Reads 0
Downloads 0

The use of alternative fuels in compression ignition engines, either completely or partially replacing the conventional ones, have potential to reduce pollutant emissions (especially soot). However, some of these fuels do not provide good ignition features under diesel engine like conditions, which affects engine efficiency. Thus, in order to extend the application of alternative fuels, the current research proposes the use of a laser induced plasma ignition system to assist on the combustion of blends of fuels with less reactivity than pure diesel. This fuel has been chosen as the base component and it has been mixed with gasoline (as the low-reactivity fuel) in different ratios as an example of fuels with very different reactivity properties. Tests have been performed in a single cylinder optically accessible engine, allowing deeper study of combustion development and soot formation. For different in-cylinder conditions and fuel blends, the effect of laser induced plasma ignition system has been evaluated at different crank angle degrees and locations inside the combustion chamber. The application of these blends under low-reactivity engine conditions show that combustion efficiency is dramatically affected. However, the study proves that it is possible to control blend ignition delay and flame lift-off length by means of laser induced plasma. Besides, using the proper ignition system configuration, combustion characteristics similar to those of diesel fuel autoignition can be achieved for high gasoline substitution rates. They lead to similar energy release rates, which confirms that diesel-gasoline blends can reach a combustion efficiency close to pure diesel, while a strong reduction on soot formation was also obtained. These results open a door to efficiency improvement and pollutant reduction by means of a highly tunable ignition of alternative fuel blends.

ACS Style

José V. Pastor; José M. García-Oliver; Antonio García; Carlos Micó. Combustion improvement and pollutants reduction with diesel-gasoline blends by means of a highly tunable laser plasma induced ignition system. Journal of Cleaner Production 2020, 271, 122499 .

AMA Style

José V. Pastor, José M. García-Oliver, Antonio García, Carlos Micó. Combustion improvement and pollutants reduction with diesel-gasoline blends by means of a highly tunable laser plasma induced ignition system. Journal of Cleaner Production. 2020; 271 ():122499.

Chicago/Turabian Style

José V. Pastor; José M. García-Oliver; Antonio García; Carlos Micó. 2020. "Combustion improvement and pollutants reduction with diesel-gasoline blends by means of a highly tunable laser plasma induced ignition system." Journal of Cleaner Production 271, no. : 122499.

Research article
Published: 24 October 2019 in International Journal of Engine Research
Reads 0
Downloads 0

Diesel spray modeling is a multi-scale problem with complex interactions between different flow regions, that is, internal nozzle flow, near-nozzle region and developed spray, including evaporation and combustion. There are several modeling approaches that have proven particularly useful for some spray regions although they have struggled at other areas, while Eulerian modeling has shown promise in dealing with all characteristics at a reasonable computational effort for engineering calculations. In this work, the [Formula: see text]–Y single-fluid diffuse-interface model, based on scale separation assumptions at high Reynolds and Weber numbers, is used to simulate the engine combustion network Sprays A and D within a Reynolds-averaged Navier–Stokes turbulence modeling approach. The study is divided into two parts. First of all, the larger diameter Spray D is modeled from the nozzle flow till evaporative spray conditions, obtaining successful prediction of numerous spray metrics, paying special attention to the near-nozzle region where spray dispersion and interfacial surface area can be validated against measurements conducted at the Advanced Photon Source at Argonne National Laboratory, including both the ultra-small-angle X-ray scattering and the X-ray radiography. Afterwards, an analysis of the modeling predictions is made in comparison with previous results obtained for Spray A, considering the nozzle geometry effects in the modeling behavior.

ACS Style

Adrián Pandal; Jose M Garcia-Oliver; Jose-Manuel Pastor. Eulerian CFD modeling of nozzle geometry effects on ECN Sprays A and D: assessment and analysis. International Journal of Engine Research 2019, 21, 73 -88.

AMA Style

Adrián Pandal, Jose M Garcia-Oliver, Jose-Manuel Pastor. Eulerian CFD modeling of nozzle geometry effects on ECN Sprays A and D: assessment and analysis. International Journal of Engine Research. 2019; 21 (1):73-88.

Chicago/Turabian Style

Adrián Pandal; Jose M Garcia-Oliver; Jose-Manuel Pastor. 2019. "Eulerian CFD modeling of nozzle geometry effects on ECN Sprays A and D: assessment and analysis." International Journal of Engine Research 21, no. 1: 73-88.

Research article
Published: 24 July 2019 in International Journal of Engine Research
Reads 0
Downloads 0

This investigation analyses the structure of spray A from engine combustion network (ECN), which is representative of diesel-like sprays, by means of large eddy simulations and an unsteady flamelet progress variable combustion model. A very good agreement between modelled and experimental measurements is obtained for the inert spray that supports further analysis. A parametric variation in oxygen concentration is carried out in order to describe the structure of the flame and how it is modified when mixture reactivity is changed. The most relevant trends for the flame metrics, ignition delay and lift-off length are well-captured by the simulations corroborating the suitability of the model for this type of configuration. Results show that the morphology of the flame is strongly affected by the boundary conditions in terms of the reactive scalar spatial fields and Z–T maps. The filtered instantaneous fields provided by the simulations allow investigation of the structure of the flame at the lift-off length, whose positioning shows low fluctuations, and how it is affected by turbulence. It is evidenced that small ignition kernels appear upstream and detached from the flame that eventually merge with its base in agreement with experimental observations, leading to state that auto-ignition plays a key role as one of the flame stabilization mechanisms of the flame.

ACS Style

Eduardo Javier Pérez-Sánchez; Jose M María García-Oliver; Ricardo Novella; Jose-Manuel Pastor. Understanding the diesel-like spray characteristics applying a flamelet-based combustion model and detailed large eddy simulations. International Journal of Engine Research 2019, 21, 134 -150.

AMA Style

Eduardo Javier Pérez-Sánchez, Jose M María García-Oliver, Ricardo Novella, Jose-Manuel Pastor. Understanding the diesel-like spray characteristics applying a flamelet-based combustion model and detailed large eddy simulations. International Journal of Engine Research. 2019; 21 (1):134-150.

Chicago/Turabian Style

Eduardo Javier Pérez-Sánchez; Jose M María García-Oliver; Ricardo Novella; Jose-Manuel Pastor. 2019. "Understanding the diesel-like spray characteristics applying a flamelet-based combustion model and detailed large eddy simulations." International Journal of Engine Research 21, no. 1: 134-150.

Journal article
Published: 19 July 2019 in International Journal of Engine Research
Reads 0
Downloads 0

The role of nozzle diameter on diesel combustion is studied by performing computational fluid dynamics calculations of Spray A and Spray D from the Engine Combustion Network. These are well-characterized single-hole sprays in a quiescent environment chamber with thermodynamic conditions representative of modern diesel engines. First, the inert spray evolution is described with the inclusion of the concept of mixing trajectories and local residence time into the analysis. Such concepts enable the quantification of the mixing rate, showing that it decreases with the increase in nozzle diameter. In a second step, the reacting spray evolution is studied focusing on the local heat release rate distribution during the auto-ignition sequence and the quasi-steady state. The capability of a well-mixed-based and a flamelet-based combustion model to predict diesel combustion is also assessed. On one hand, results show that turbulence–chemistry interaction has a profound effect on the description of the reacting spray evolution. On the other hand, the mixing rate, characterized in terms of the local residence time, drives the main changes introduced by the increase of the nozzle diameter when comparing Spray A and Spray D.

ACS Style

Jose M DeSantes; Jose M García-Oliver; Ricardo Novella; Leonardo Pachano. A numerical study of the effect of nozzle diameter on diesel combustion ignition and flame stabilization. International Journal of Engine Research 2019, 21, 101 -121.

AMA Style

Jose M DeSantes, Jose M García-Oliver, Ricardo Novella, Leonardo Pachano. A numerical study of the effect of nozzle diameter on diesel combustion ignition and flame stabilization. International Journal of Engine Research. 2019; 21 (1):101-121.

Chicago/Turabian Style

Jose M DeSantes; Jose M García-Oliver; Ricardo Novella; Leonardo Pachano. 2019. "A numerical study of the effect of nozzle diameter on diesel combustion ignition and flame stabilization." International Journal of Engine Research 21, no. 1: 101-121.

Journal article
Published: 01 May 2017 in Combustion and Flame
Reads 0
Downloads 0

International audienceA detailed study on the spray local flow and flame structure has been performed by means of PIV and laser-sheet LIF techniques under Diesel spray conditions. Operating conditions were based on Engine Combustion Network recommendations. A consistent comparison of inert and reacting axial velocity fields has produced quantitative information on the effect of heat release on the local flow. Local axial velocity has been shown to increase 50 to 60% compared to the inert case, while the combustion-induced radial expansion of the spray has been quantified in terms of a 0.9 to 2.1 mm radius increase. As a result, the drop in entrainment rate has been quantified around 25% compared to the inert case. Streamline analysis also hints at a reduced entrainment under reacting conditions. A 1D spray model under reacting condition has been used, which confirms the modifications obtained in the main flow metrics when moving from inert to reacting conditions. When comparing the flow evolution with the flame structure, little effect of chemical activity on the spray flow upstream the lift-off length has been evidenced, in spite of the presence of formaldehyde in such regions. Only downstream of the lift-off length, as defined by OH LIF, has a strong change in flow pattern been observed as a result of combustion-induced heat release

ACS Style

José M. García-Oliver; Louis-Marie Malbec; Hubert Baya Toda; Gilles Bruneaux. A study on the interaction between local flow and flame structure for mixing-controlled Diesel sprays. Combustion and Flame 2017, 179, 157 -171.

AMA Style

José M. García-Oliver, Louis-Marie Malbec, Hubert Baya Toda, Gilles Bruneaux. A study on the interaction between local flow and flame structure for mixing-controlled Diesel sprays. Combustion and Flame. 2017; 179 ():157-171.

Chicago/Turabian Style

José M. García-Oliver; Louis-Marie Malbec; Hubert Baya Toda; Gilles Bruneaux. 2017. "A study on the interaction between local flow and flame structure for mixing-controlled Diesel sprays." Combustion and Flame 179, no. : 157-171.

Journal article
Published: 01 February 2016 in Combustion and Flame
Reads 0
Downloads 0
ACS Style

José V. Pastor; José M. García-Oliver; Antonio García; Carlos Micó; Sebastian Möller. Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions. Combustion and Flame 2016, 164, 212 -223.

AMA Style

José V. Pastor, José M. García-Oliver, Antonio García, Carlos Micó, Sebastian Möller. Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions. Combustion and Flame. 2016; 164 ():212-223.

Chicago/Turabian Style

José V. Pastor; José M. García-Oliver; Antonio García; Carlos Micó; Sebastian Möller. 2016. "Application of optical diagnostics to the quantification of soot in n-alkane flames under diesel conditions." Combustion and Flame 164, no. : 212-223.

Journal article
Published: 22 December 2015 in International Journal of Multiphase Flow
Reads 0
Downloads 0

This work evaluates the performance of the Σ-Y Eulerian atomization model at reproducing the internal structure of a diesel spray in the near-field. In the study, three different computational domains have been used in order to perform 3D and 2D coupled simulations, where the internal nozzle flow and external spray are modeled in one continuous domain, and 2D decoupled simulations, where only the external spray is modeled. While the 3D simulation did the best job of capturing the dense zone of the spray, the 2D simulations also performed well, with the coupled 2D simulation slightly outperforming the decoupled simulation. The similarity in results between the coupled and the decoupled simulation show that internal and external flow calculations can be performed independently. In addition, the use of spatially averaged nozzle outlet conditions, in the case of an axisymmetric (single-hole) convergent nozzle, leads to a slightly worse near-field spray predictions but to an accurate far-field ones. Finally, a novel constraint on turbulent driven mixing multiphase flows is introduced which prevents the slip velocity from exceeding the magnitude of the turbulent fluctuations through a realizable Schmidt number. This constraint increased model stability, allowing for a 4x increase in Courant number.

ACS Style

J.M. Desantes; J.M. García-Oliver; J.M. Pastor; A. Pandal; E. Baldwin; D.P. Schmidt. Coupled/decoupled spray simulation comparison of the ECN spray a condition with the -Y Eulerian atomization model. International Journal of Multiphase Flow 2015, 80, 89 -99.

AMA Style

J.M. Desantes, J.M. García-Oliver, J.M. Pastor, A. Pandal, E. Baldwin, D.P. Schmidt. Coupled/decoupled spray simulation comparison of the ECN spray a condition with the -Y Eulerian atomization model. International Journal of Multiphase Flow. 2015; 80 ():89-99.

Chicago/Turabian Style

J.M. Desantes; J.M. García-Oliver; J.M. Pastor; A. Pandal; E. Baldwin; D.P. Schmidt. 2015. "Coupled/decoupled spray simulation comparison of the ECN spray a condition with the -Y Eulerian atomization model." International Journal of Multiphase Flow 80, no. : 89-99.

Journal article
Published: 01 November 2015 in Applied Thermal Engineering
Reads 0
Downloads 0
ACS Style

Raul Payri; Jose M. García-Oliver; Tiemin Xuan; Michele Bardi. A study on diesel spray tip penetration and radial expansion under reacting conditions. Applied Thermal Engineering 2015, 90, 619 -629.

AMA Style

Raul Payri, Jose M. García-Oliver, Tiemin Xuan, Michele Bardi. A study on diesel spray tip penetration and radial expansion under reacting conditions. Applied Thermal Engineering. 2015; 90 ():619-629.

Chicago/Turabian Style

Raul Payri; Jose M. García-Oliver; Tiemin Xuan; Michele Bardi. 2015. "A study on diesel spray tip penetration and radial expansion under reacting conditions." Applied Thermal Engineering 90, no. : 619-629.

Journal article
Published: 01 September 2014 in Applied Thermal Engineering
Reads 0
Downloads 0
ACS Style

J. Javier López; J.M. García-Oliver; A. García; V. Domenech. Gasoline effects on spray characteristics, mixing and auto-ignition processes in a CI engine under Partially Premixed Combustion conditions. Applied Thermal Engineering 2014, 70, 996 -1006.

AMA Style

J. Javier López, J.M. García-Oliver, A. García, V. Domenech. Gasoline effects on spray characteristics, mixing and auto-ignition processes in a CI engine under Partially Premixed Combustion conditions. Applied Thermal Engineering. 2014; 70 (1):996-1006.

Chicago/Turabian Style

J. Javier López; J.M. García-Oliver; A. García; V. Domenech. 2014. "Gasoline effects on spray characteristics, mixing and auto-ignition processes in a CI engine under Partially Premixed Combustion conditions." Applied Thermal Engineering 70, no. 1: 996-1006.

Erratum
Published: 28 February 2009 in Fuel
Reads 0
Downloads 0
ACS Style

José V. Pastor; J. Javier López; José M. García; José M. Pastor. Corrigendum to “A 1D model for the description of mixing-controlled inert diesel sprays” [Fuel 87 (13–14) (2008) 2871–2885]. Fuel 2009, 88, 391 .

AMA Style

José V. Pastor, J. Javier López, José M. García, José M. Pastor. Corrigendum to “A 1D model for the description of mixing-controlled inert diesel sprays” [Fuel 87 (13–14) (2008) 2871–2885]. Fuel. 2009; 88 (2):391.

Chicago/Turabian Style

José V. Pastor; J. Javier López; José M. García; José M. Pastor. 2009. "Corrigendum to “A 1D model for the description of mixing-controlled inert diesel sprays” [Fuel 87 (13–14) (2008) 2871–2885]." Fuel 88, no. 2: 391.

Journal article
Published: 31 January 2009 in Combustion and Flame
Reads 0
Downloads 0

The paper reports an investigation on the transient evolution of diesel flames in terms of fuel–air mixing, spray penetration and combustion rate. A one-dimensional (1D) spray model, which was previously validated for inert diesel sprays, is extended to reacting conditions. The main assumptions of the model are the mixing-controlled hypothesis and the validity of self-similarity for conservative properties. Validation is achieved by comparing model predictions with both CFD gas jet simulations and experimental diesel spray measurements. The 1D model provides valuable insight into the evolution of the flow within the spray (momentum and mass fluxes, tip penetration, etc.) when shifting from inert to reacting conditions. Results show that the transient diesel flame evolution is mainly governed by two combustion-induced effects, namely the reduction in local density and the increase in flame radial width.

ACS Style

J.M. Desantes; J.V. Pastor; J.M. García-Oliver. A 1D model for the description of mixing-controlled reacting diesel sprays. Combustion and Flame 2009, 156, 234 -249.

AMA Style

J.M. Desantes, J.V. Pastor, J.M. García-Oliver. A 1D model for the description of mixing-controlled reacting diesel sprays. Combustion and Flame. 2009; 156 (1):234-249.

Chicago/Turabian Style

J.M. Desantes; J.V. Pastor; J.M. García-Oliver. 2009. "A 1D model for the description of mixing-controlled reacting diesel sprays." Combustion and Flame 156, no. 1: 234-249.

Journal article
Published: 31 October 2008 in Fuel
Reads 0
Downloads 0

The paper reports an investigation focusing on the transient evolution of diesel sprays. In order to understand the relationship between fuel–air mixing and spray penetration, a one-dimensional spray model is developed, which is capable of predicting the spray behaviour under transient conditions. The main assumptions of the model are the mixing-controlled hypothesis and the validity of self-similarity for conservative properties. Validation of such concepts is achieved by comparing model predictions with both CFD gas jet simulations and experimental diesel spray measurements. Results show that a reasonable estimation of the spray evolution can be obtained for both non-vaporising and vaporising conditions.

ACS Style

José V. Pastor; J Javierlopez; J Garcia. A 1D model for the description of mixing-controlled inert diesel sprays. Fuel 2008, 87, 2871 -2885.

AMA Style

José V. Pastor, J Javierlopez, J Garcia. A 1D model for the description of mixing-controlled inert diesel sprays. Fuel. 2008; 87 (13):2871-2885.

Chicago/Turabian Style

José V. Pastor; J Javierlopez; J Garcia. 2008. "A 1D model for the description of mixing-controlled inert diesel sprays." Fuel 87, no. 13: 2871-2885.