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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.
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 StyleJosé 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 StyleJosé 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.
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.
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 StyleJosé 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 StyleJosé 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.
José V. Pastor; Antonio García; Carlos Micó; Felipe Lewiski. An optical investigation of Fischer-Tropsch diesel and Oxymethylene dimethyl ether impact on combustion process for CI engines. Applied Energy 2020, 260, 1 .
AMA StyleJosé V. Pastor, Antonio García, Carlos Micó, Felipe Lewiski. An optical investigation of Fischer-Tropsch diesel and Oxymethylene dimethyl ether impact on combustion process for CI engines. Applied Energy. 2020; 260 ():1.
Chicago/Turabian StyleJosé V. Pastor; Antonio García; Carlos Micó; Felipe Lewiski. 2020. "An optical investigation of Fischer-Tropsch diesel and Oxymethylene dimethyl ether impact on combustion process for CI engines." Applied Energy 260, no. : 1.
José V. Pastor; A. García; C. Micó; Alba A. García-Carrero. Experimental study of influence of Liquefied Petroleum Gas addition in Hydrotreated Vegetable Oil fuel on ignition delay, flame lift off length and soot emission under diesel-like conditions. Fuel 2020, 260, 1 .
AMA StyleJosé V. Pastor, A. García, C. Micó, Alba A. García-Carrero. Experimental study of influence of Liquefied Petroleum Gas addition in Hydrotreated Vegetable Oil fuel on ignition delay, flame lift off length and soot emission under diesel-like conditions. Fuel. 2020; 260 ():1.
Chicago/Turabian StyleJosé V. Pastor; A. García; C. Micó; Alba A. García-Carrero. 2020. "Experimental study of influence of Liquefied Petroleum Gas addition in Hydrotreated Vegetable Oil fuel on ignition delay, flame lift off length and soot emission under diesel-like conditions." Fuel 260, no. : 1.
With demanding emissions legislations and the need for higher efficiency, new technologies for compression ignition engines are in development. One of them relies on reducing the heat losses of the engine during the combustion process as well as to devise injection strategies that reduce soot formation. Therefore, it is necessary a better comprehension about the turbulent kinetic energy (TKE) distribution inside the cylinder and how it is affected by the interaction between air flow motion and fuel spray. Furthermore, new diesel engines are characterized by massive decrease of NOx emissions. Therefore, considering the well-known NOx-soot trade-off, it is necessary a better comprehension and overall quantification of soot formation and how the different injection strategies can impact it. The present study aims to define a methodology to analyze the velocity field and consequently TKE distribution as well as to characterize soot formation inside of a real bowl geometry considering different operating conditions. For that purpose, two different optical techniques were simultaneously applied in this study. On the one hand, in-cylinder velocity fields were measured by using 2D standard Particle Image Velocimetry (PIV) under injection (non-reactive ambient) and motored conditions by using single injection strategy. On the other hand, soot formation was quantified by Diffused back-illumination imaging technique (DBI) under firing conditions and multiple injection pattern. The experiments were carried out in a single cylinder optical engine based in a commercial GM MDE light duty diesel engine with specific bottom and side optical accesses from the liner and the piston. As the optical piston features the same metal bowl geometry, it was necessary to solve significant hurdles to accurately implement the optical techniques under fully real engine conditions. Injection events for PIV measurements were performed at different laser timings with a vertical laser sheet centered in the middle of the cylinder using a single injection strategy. For the DBI measurements, tests were performed in 3 different firing conditions, using four injection events and three injection pressures. Results indicate that, in comparison with motored condition, fuel spray reduce flow velocity and impact directly on TKE distribution. DBI measurements highlight also that, as the load increases, the KL value increases as well. Furthermore, the results show that the injection timing impacts directly in the KL value.
José V. Pastor; Antonio Garcia; Carlos Micó; Felipe Lewiski; Alberto Vassallo; Francesco Concetto Pesce. PIV and DBI Experimental Characterization of Air Flow-Spray Interaction and Soot Formation in a Single Cylinder Optical Diesel Engine Using a Real Bowl Geometry Piston. SAE Technical Paper Series 2019, 1 .
AMA StyleJosé V. Pastor, Antonio Garcia, Carlos Micó, Felipe Lewiski, Alberto Vassallo, Francesco Concetto Pesce. PIV and DBI Experimental Characterization of Air Flow-Spray Interaction and Soot Formation in a Single Cylinder Optical Diesel Engine Using a Real Bowl Geometry Piston. SAE Technical Paper Series. 2019; ():1.
Chicago/Turabian StyleJosé V. Pastor; Antonio Garcia; Carlos Micó; Felipe Lewiski; Alberto Vassallo; Francesco Concetto Pesce. 2019. "PIV and DBI Experimental Characterization of Air Flow-Spray Interaction and Soot Formation in a Single Cylinder Optical Diesel Engine Using a Real Bowl Geometry Piston." SAE Technical Paper Series , no. : 1.
Even though different optical techniques have been applied on ‘Spray A’ in-flame soot quantification within Engine Combustion Network in recent years, little information can be found for soot temperature measurement. In this study, a combined extinction and radiation methodology has been developed with different wavelengths and applied on quasi-steady Diesel flame to obtain the soot amount and temperature distribution simultaneously by considering self-absorption issues. All the measurements were conducted in a constant pressure combustion chamber. The fuel as well as the operating conditions and the injector used were chosen following the guidelines of the Engine Combustion Network. Uncertainty caused by wavelength selection was evaluated. Additionally, temperature-equivalence ratio maps were constructed by combining the measurements with a 1D spray model. Temperature fields during the quasi-steady combustion phase show peak temperatures around the limit of the radiation field, in agreement with a typical diffusion flame structure. Effects of different operating parameters on soot formation and temperature were investigated. Soot temperature increases dramatically with oxygen concentration, but it shows much less sensitivity with ambient temperature and injection pressure, which on the other hand have significant effects on soot production.
Tiemin Xuan; Jose M. Desantes; Jose V. Pastor; Jose M. Garcia-Oliver. Soot temperature characterization of spray a flames by combined extinction and radiation methodology. Combustion and Flame 2019, 204, 290 -303.
AMA StyleTiemin Xuan, Jose M. Desantes, Jose V. Pastor, Jose M. Garcia-Oliver. Soot temperature characterization of spray a flames by combined extinction and radiation methodology. Combustion and Flame. 2019; 204 ():290-303.
Chicago/Turabian StyleTiemin Xuan; Jose M. Desantes; Jose V. Pastor; Jose M. Garcia-Oliver. 2019. "Soot temperature characterization of spray a flames by combined extinction and radiation methodology." Combustion and Flame 204, no. : 290-303.
Optical engines allow for the direct visualization of the phenomena taking place in the combustion chamber and the application of optical techniques for combustion analysis, which makes them invaluable tools for the study of advanced combustion modes aimed at reducing pollutant emissions and increasing efficiency. An accurate thermodynamic analysis of the engine performance based on the in-cylinder pressure provides key information regarding the gas properties, the heat release, and the mixing conditions. If, in addition, optical access to the combustion process is provided, a deeper understanding of the phenomena can be derived, allowing the complete assessment of new injection-combustion strategies to be depicted. However, the optical engine is only useful for this purpose if the geometry, heat transfer, and thermodynamic conditions of the optical engine can mimic those of a real engine. Consequently, a reliable thermodynamic analysis of the optical engine itself is mandatory to accurately determine a number of uncertain parameters among which the effective compression ratio and heat transfer coefficient are of special importance. In the case of optical engines, the determination of such uncertainties is especially challenging due to their intrinsic features regarding the large mechanical deformations of the elongated piston caused by the pressure, and the specific thermal characteristics that affect the in-cylinder conditions. In this work, a specific methodology for optical engine characterization based on the combination of experimental measurements and in-cylinder 0D modeling is presented. On one hand, the method takes into account the experimental deformations measured with a high-speed camera in order to determine the effective compression ratio; on the other hand, the 0D thermodynamic analysis is used to calibrate the heat transfer model and to determine the rest of the uncertainties based on the minimization of the heat release rate residual in motored conditions. The method has been demonstrated to be reliable to characterize the optical engine, providing an accurate in-cylinder volume trace with a maximum deformation of 0.5 mm at 80 bar of peak pressure and good experimental vs. simulated in-cylinder pressure fitting.
José V. Pastor; Pablo Olmeda; Jaime Martín; Felipe Lewiski. Methodology for Optical Engine Characterization by Means of the Combination of Experimental and Modeling Techniques. Applied Sciences 2018, 8, 2571 .
AMA StyleJosé V. Pastor, Pablo Olmeda, Jaime Martín, Felipe Lewiski. Methodology for Optical Engine Characterization by Means of the Combination of Experimental and Modeling Techniques. Applied Sciences. 2018; 8 (12):2571.
Chicago/Turabian StyleJosé V. Pastor; Pablo Olmeda; Jaime Martín; Felipe Lewiski. 2018. "Methodology for Optical Engine Characterization by Means of the Combination of Experimental and Modeling Techniques." Applied Sciences 8, no. 12: 2571.
Because of the challenge of meeting stringent emissions regulations for internal combustion engines, some advanced low temperature combustion modes have been raised in recent decades to improve combustion efficiency. Therefore, detailed understanding and capability for accurate prediction of in-flame soot processes under such low sooting conditions are becoming necessary. Nowadays, a lot of investigations have been carried out to quantify in-flame soot in Diesel sprays under high sooting conditions by means of different optical techniques. However, no information of soot quantification can be found for sooting/non-sooting critical conditions. In current study, the instantaneous soot production in a two-stroke optical engine under low sooting conditions has been measured by means of a Diffused back-illumination extinction technique (DBI) and two-color method (2C) simultaneously. The fuels used were n-dodecane and n-heptane, which have been injected separately though two different injectors equipped with single-hole nozzles. A large cycle-to-cycle variation on soot production can be observed under such operating conditions, however the in-cylinder heat release traces were quite repeatable. It is the same with the well-known trends of soot amount to operating conditions that the probability of sooting cycles increases with higher ambient temperature, higher ambient density and lower injection pressure. Both techniques present a pretty good agreement on soot amount when the peak of KL value is close to 1. However, the KL value of two-color method becomes bigger than that of DBI and the difference increases with lower sooting conditions.
Tiemin Xuan; José V. Pastor; José María García-Oliver; Antonio García; Zhixia He; Qian Wang; Miriam Reyes. In-flame soot quantification of diesel sprays under sooting/non-sooting critical conditions in an optical engine. Applied Thermal Engineering 2018, 149, 1 -10.
AMA StyleTiemin Xuan, José V. Pastor, José María García-Oliver, Antonio García, Zhixia He, Qian Wang, Miriam Reyes. In-flame soot quantification of diesel sprays under sooting/non-sooting critical conditions in an optical engine. Applied Thermal Engineering. 2018; 149 ():1-10.
Chicago/Turabian StyleTiemin Xuan; José V. Pastor; José María García-Oliver; Antonio García; Zhixia He; Qian Wang; Miriam Reyes. 2018. "In-flame soot quantification of diesel sprays under sooting/non-sooting critical conditions in an optical engine." Applied Thermal Engineering 149, no. : 1-10.
Chemiluminescence emissions measurements of OH* and CH* are used to characterize the combustion of blends of methane and hydrogen in air in a constant volume combustion bomb, with two sets of initial conditions. The combined results of combustion development cover from 0.1 to 2.5 MPa. Burning velocity, heat release and unburned/burned gas temperatures are obtained from the pressure by using a two-zone thermodynamic combustion diagnostic model. Intensity of OH* and CH* increases with the initial temperature and the percentage of hydrogen, in parallel with the usual increase in burning velocity. The timings of the peaks of OH* and CH* chemiluminescence emissions are found to correlate respectively with the maximum rate of heat release and flame temperature. These results show that both chemiluminescence signals can be used to monitorize the burning process in combustion devices operating in the pressure range studied.
M. Reyes; F.V. Tinaut; B. Giménez; José V. Pastor. Effect of hydrogen addition on the OH* and CH* chemiluminescence emissions of premixed combustion of methane-air mixtures. International Journal of Hydrogen Energy 2018, 43, 19778 -19791.
AMA StyleM. Reyes, F.V. Tinaut, B. Giménez, José V. Pastor. Effect of hydrogen addition on the OH* and CH* chemiluminescence emissions of premixed combustion of methane-air mixtures. International Journal of Hydrogen Energy. 2018; 43 (42):19778-19791.
Chicago/Turabian StyleM. Reyes; F.V. Tinaut; B. Giménez; José V. Pastor. 2018. "Effect of hydrogen addition on the OH* and CH* chemiluminescence emissions of premixed combustion of methane-air mixtures." International Journal of Hydrogen Energy 43, no. 42: 19778-19791.
The Engine Combustion Network (ECN) is a coordinate effort from research partners from all over the world which aims at creating a large experimental database to validate CFD calculations. Two injectors from ECN, namely Spray C and D, have been compared in a constant pressure flow vessel, which enables a field of view of more than 100 mm. Both nozzles have been designed with similar flow metrics, with Spray D having a convergent hole shape and Spray C a cylindrical one, the latter being therefore more prone to cavitation. Although the focus of the study is on reacting conditions, some inert cases have also been measured. High speed schlieren imaging, OH* chemiluminescence visualization and head-on broadband luminosity have been used as combustion diagnostics to evaluate ignition delay, lift off length and reacting tip penetration. Parametric variations include ambient temperature, oxygen content and injection pressure variations. Results extend the range of variation of previously reported experiments in the literature for such nozzles, showing good agreement with such previous results and enlarging the available database for CFD validation. A systematic shorter lift-off length is observed for Spray C, while ignition delay from broadband luminosity and schlieren visualization show no clear difference between both nozzles. Comparison against literature results from Spray A has also been performed, from which behavior of the larger nozzles is seen to be highly affected by the slower mixing process.
Jose V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Andrés Morales López. An Experimental Investigation on Spray Mixing and Combustion Characteristics for Spray C/D Nozzles in a Constant Pressure Vessel. SAE Technical Paper Series 2018, 1 .
AMA StyleJose V. Pastor, Jose M Garcia-Oliver, Antonio Garcia, Andrés Morales López. An Experimental Investigation on Spray Mixing and Combustion Characteristics for Spray C/D Nozzles in a Constant Pressure Vessel. SAE Technical Paper Series. 2018; ():1.
Chicago/Turabian StyleJose V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Andrés Morales López. 2018. "An Experimental Investigation on Spray Mixing and Combustion Characteristics for Spray C/D Nozzles in a Constant Pressure Vessel." SAE Technical Paper Series , no. : 1.
It is known that in-cylinder airflow structures during intake and compression strokes deeply affects the combustion process in compression ignition (CI) engines. This work presents a methodology for the analysis of the swirling structures by means of the CFD proprietary code Converge 2.3. The methodology is based on the CFD modelling and the comparison of results with in-cylinder velocity fields measured by particle image velocimetry (PIV). Furthermore, the analysis is extended to the accuracy evaluation of other methods available to define the flow in the cylinder of internal combustion engines, such as experiments in steady flow rigs. These methods, in junction with simple phenomenological models, have been traditionally used to determine some of the fundamental variables that define the in-cylinder flow in ICE engines. The CFD analysis is focused in the flow structures around top dead centre (TDC) at the end of the compression stroke. The Averaged swirl ratio (SR) and the distance of the vortex core center to the cylinder axis have been analyzed for different operation points and different swirl levels. Furthermore, the importance of the vortex precession effects has been also studied in detail. Good agreement has been found between the CFD and PIV measurements. Nevertheless, they are significantly lower than those obtained by traditional/simple methods based on Steady Test Rigs.
Antonio Gil; Jose V. Pastor; Antonio Garcia; Leonardo Pachano. Combined CFD - PIV Methodology for the Characterization of Air Flow in a Diesel Engine. SAE Technical Paper Series 2018, 1 .
AMA StyleAntonio Gil, Jose V. Pastor, Antonio Garcia, Leonardo Pachano. Combined CFD - PIV Methodology for the Characterization of Air Flow in a Diesel Engine. SAE Technical Paper Series. 2018; ():1.
Chicago/Turabian StyleAntonio Gil; Jose V. Pastor; Antonio Garcia; Leonardo Pachano. 2018. "Combined CFD - PIV Methodology for the Characterization of Air Flow in a Diesel Engine." SAE Technical Paper Series , no. : 1.
An experimental measurement campaign is presented where particle image velocimetry (PIV) was used in an effort to characterize the velocity field in a turbocharger compressor when unstable operating conditions lead to flow reversing from the diffuser into the inlet pipe. Previous studies have successfully used this and similar techniques, but the most relevant results have been obtained in an open compressor where the backflow can diffuse into the ambient. In this work a glass pipe long enough to confine the full extent of the backflow has been used. Advantage was taken from the fact that this backflow is at higher temperature due to the compression process, enabling a preliminary work where a thermocouple array was used to estimate its maximum length across the compressor map. Using these results as a reference both axial and transversal velocity fields were measured. Issues associated with each one are described, along with relevant results that show how the technique correctly identifies the reversed flow, a conclusion that is supported by the comparison of the velocity average and standard deviation profiles with those of measured temperature.
Antonio J. Torregrosa; A. Broatch; José V. Pastor; J. García-Tíscar; R.K. Sharma; R. Cheung. Measuring turbocharger compressor inlet backflow through particle image velocimetry. Experimental Thermal and Fluid Science 2018, 99, 420 -432.
AMA StyleAntonio J. Torregrosa, A. Broatch, José V. Pastor, J. García-Tíscar, R.K. Sharma, R. Cheung. Measuring turbocharger compressor inlet backflow through particle image velocimetry. Experimental Thermal and Fluid Science. 2018; 99 ():420-432.
Chicago/Turabian StyleAntonio J. Torregrosa; A. Broatch; José V. Pastor; J. García-Tíscar; R.K. Sharma; R. Cheung. 2018. "Measuring turbocharger compressor inlet backflow through particle image velocimetry." Experimental Thermal and Fluid Science 99, no. : 420-432.
Ever decreasing permitted emission levels and the necessity of more efficient engines demand a better understanding of in-cylinder phenomena. In swirl-supported compression ignition (CI) engines, mean in-cylinder flow structures formed during the intake stroke deeply influence mixture preparation prior to combustion, heat transfer and pollutant oxidation all of which could potentially improve engine performance. Therefore, the ability to characterize these mean flow structures is relevant for achieving performance improvements. CI mean flow structure is mainly described by a precessing vortex. The location of the vortex center is key for the characterization of the flow structure. Consequently, this work aims at evaluating algorithms that allow for the location of the vortex center both, in ensemble-averaged velocity fields and in instantaneous velocity fields. The study is carried out on velocity fields measured using Particle Image Velocimetry (PIV) in an optical light-duty CI engine operated under motored conditions. The algorithms are applied to both ensemble-averaged and instantaneous velocity fields, to evaluate the robustness of the different approaches. When used for instantaneous velocity fields, algorithms based on velocity field’s magnitudes are less robust and might fail to locate the vortex center. On the contrary, an algorithm based on the velocity field topology successfully locate the vortex center location.
José V. Pastor; José M García-Oliver; Antonio García; Leonardo Pachano. Evaluation of Vortex Center Location Algorithms for Particle Image Velocimetry Data in an Optical Light-Duty Compression Ignition Engine. SAE Technical Paper Series 2018, 1 .
AMA StyleJosé V. Pastor, José M García-Oliver, Antonio García, Leonardo Pachano. Evaluation of Vortex Center Location Algorithms for Particle Image Velocimetry Data in an Optical Light-Duty Compression Ignition Engine. SAE Technical Paper Series. 2018; ():1.
Chicago/Turabian StyleJosé V. Pastor; José M García-Oliver; Antonio García; Leonardo Pachano. 2018. "Evaluation of Vortex Center Location Algorithms for Particle Image Velocimetry Data in an Optical Light-Duty Compression Ignition Engine." SAE Technical Paper Series , no. : 1.
Slavey Tanov; Leonardo Pachano; Öivind Andersson; Zhenkan Wang; Mattias Richter; José V. Pastor; José M. García-Oliver; Antonio García. Influence of spatial and temporal distribution of Turbulent Kinetic Energy on heat transfer coefficient in a light duty CI engine operating with Partially Premixed Combustion. Applied Thermal Engineering 2018, 129, 31 -40.
AMA StyleSlavey Tanov, Leonardo Pachano, Öivind Andersson, Zhenkan Wang, Mattias Richter, José V. Pastor, José M. García-Oliver, Antonio García. Influence of spatial and temporal distribution of Turbulent Kinetic Energy on heat transfer coefficient in a light duty CI engine operating with Partially Premixed Combustion. Applied Thermal Engineering. 2018; 129 ():31-40.
Chicago/Turabian StyleSlavey Tanov; Leonardo Pachano; Öivind Andersson; Zhenkan Wang; Mattias Richter; José V. Pastor; José M. García-Oliver; Antonio García. 2018. "Influence of spatial and temporal distribution of Turbulent Kinetic Energy on heat transfer coefficient in a light duty CI engine operating with Partially Premixed Combustion." Applied Thermal Engineering 129, no. : 31-40.
The aim of this paper is to identify and investigate the potential and limitations of diesel–gas combustion concepts for high speed large engines operated in gas mode with very small amounts of pilot fuel (
Christoph Redtenbacher; Constantin Kiesling; Maximilian Malin; Andreas Wimmer; José V. Pastor; Mattia Pinotti. Potential and Limitations of Dual Fuel Operation of High Speed Large Engines. Journal of Energy Resources Technology 2017, 140, 032205 .
AMA StyleChristoph Redtenbacher, Constantin Kiesling, Maximilian Malin, Andreas Wimmer, José V. Pastor, Mattia Pinotti. Potential and Limitations of Dual Fuel Operation of High Speed Large Engines. Journal of Energy Resources Technology. 2017; 140 (3):032205.
Chicago/Turabian StyleChristoph Redtenbacher; Constantin Kiesling; Maximilian Malin; Andreas Wimmer; José V. Pastor; Mattia Pinotti. 2017. "Potential and Limitations of Dual Fuel Operation of High Speed Large Engines." Journal of Energy Resources Technology 140, no. 3: 032205.
This work describes the update of an optical engine design with the aim of increasing its capabilities when used for combustion studies. The criteria followed to perform the optical engine redesign were: maximize the optical accessibility to the combustion chamber, minimize the time consumed to clean the optical parts, and minimize the adaptation costs. To meet these requirements, a modular design using window-holders to fit the windows in the optical flange, was proposed. This novel solution allows optical access near the cylinder-head plane while maintaining high operating flexibility (i.e. fast transition between optical and metal engine, and very fast cleaning procedure). The new engine design has three additional optical accesses to the combustion chamber and resulted in more efficient operation compared to the original design, reducing the time consumed to clean the optical parts from 40 down to 10 min. Two main parameters of the new engine were characterized, the effective compression ratio and the rotatory flow field velocity (swirl). The characterization process revealed very similar values between the effective and geometric compression ratios (14.7:1 vs 14.2:1), which confirms the use of appropriate dimensional tolerances during the machining process and low amount of blow-by. Finally, the swirl ratio was characterized through particle image velocimetry measurements for different crank timings at 1200 rpm and motored conditions, using the optical piston with a cylindrical bowl. This method revealed swirl ratios varying from 1 to 1.7 depending on the timing considered, with increasing trend as the piston moves towards the top dead center.
Jesus Benajes; José V. Pastor; A. García; Javier Monsalve-Serrano. Redesign and Characterization of a Single-Cylinder Optical Research Engine to Allow Full Optical Access and Fast Cleaning during Combustion Studies. Experimental Techniques 2017, 42, 55 -68.
AMA StyleJesus Benajes, José V. Pastor, A. García, Javier Monsalve-Serrano. Redesign and Characterization of a Single-Cylinder Optical Research Engine to Allow Full Optical Access and Fast Cleaning during Combustion Studies. Experimental Techniques. 2017; 42 (1):55-68.
Chicago/Turabian StyleJesus Benajes; José V. Pastor; A. García; Javier Monsalve-Serrano. 2017. "Redesign and Characterization of a Single-Cylinder Optical Research Engine to Allow Full Optical Access and Fast Cleaning during Combustion Studies." Experimental Techniques 42, no. 1: 55-68.
Jose V. Pastor; Jose M. Garcia-Oliver; Antonio Garcia; Mattia Pinotti. Soot Characterization of Diesel/Gasoline Blends Injected through a Single Injection System in CI engines. SAE Technical Paper Series 2017, 1, 1 .
AMA StyleJose V. Pastor, Jose M. Garcia-Oliver, Antonio Garcia, Mattia Pinotti. Soot Characterization of Diesel/Gasoline Blends Injected through a Single Injection System in CI engines. SAE Technical Paper Series. 2017; 1 ():1.
Chicago/Turabian StyleJose V. Pastor; Jose M. Garcia-Oliver; Antonio Garcia; Mattia Pinotti. 2017. "Soot Characterization of Diesel/Gasoline Blends Injected through a Single Injection System in CI engines." SAE Technical Paper Series 1, no. : 1.
C. Berna; J.E. Juliá; A. Escrivá; J.L. Muñoz-Cobo; J.V. Pastor; C. Micó. Experimental investigation of the entrained droplet velocities in a submerged jet injected into a stagnant water pool. Experimental Thermal and Fluid Science 2017, 82, 32 -41.
AMA StyleC. Berna, J.E. Juliá, A. Escrivá, J.L. Muñoz-Cobo, J.V. Pastor, C. Micó. Experimental investigation of the entrained droplet velocities in a submerged jet injected into a stagnant water pool. Experimental Thermal and Fluid Science. 2017; 82 ():32-41.
Chicago/Turabian StyleC. Berna; J.E. Juliá; A. Escrivá; J.L. Muñoz-Cobo; J.V. Pastor; C. Micó. 2017. "Experimental investigation of the entrained droplet velocities in a submerged jet injected into a stagnant water pool." Experimental Thermal and Fluid Science 82, no. : 32-41.
José V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Varun Reddy Nareddy. Characterization of Spray Evaporation and Mixing Using Blends of Commercial Gasoline and Diesel Fuels in Engine-Like Conditions. SAE Technical Paper Series 2017, 1, 1 .
AMA StyleJosé V. Pastor, Jose M Garcia-Oliver, Antonio Garcia, Varun Reddy Nareddy. Characterization of Spray Evaporation and Mixing Using Blends of Commercial Gasoline and Diesel Fuels in Engine-Like Conditions. SAE Technical Paper Series. 2017; 1 ():1.
Chicago/Turabian StyleJosé V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Varun Reddy Nareddy. 2017. "Characterization of Spray Evaporation and Mixing Using Blends of Commercial Gasoline and Diesel Fuels in Engine-Like Conditions." SAE Technical Paper Series 1, no. : 1.
José V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Wenjun Zhong; Carlos Micó; Tiemin Xuan. An Experimental Study on Diesel Spray Injection into a Non-Quiescent Chamber. SAE International Journal of Fuels and Lubricants 2017, 10, 394 -406.
AMA StyleJosé V. Pastor, Jose M Garcia-Oliver, Antonio Garcia, Wenjun Zhong, Carlos Micó, Tiemin Xuan. An Experimental Study on Diesel Spray Injection into a Non-Quiescent Chamber. SAE International Journal of Fuels and Lubricants. 2017; 10 (2):394-406.
Chicago/Turabian StyleJosé V. Pastor; Jose M Garcia-Oliver; Antonio Garcia; Wenjun Zhong; Carlos Micó; Tiemin Xuan. 2017. "An Experimental Study on Diesel Spray Injection into a Non-Quiescent Chamber." SAE International Journal of Fuels and Lubricants 10, no. 2: 394-406.