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Dr. Alexandru Cernat
University POLITEHNICA Bucharest

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Basic Info is private.

Research Keywords & Expertise

0 Diesel Engine
0 Alternative fuel
0 internal combustion engine vehicle
0 supercharging
0 spark ignition engine

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Diesel Engine
Alternative fuel
spark ignition engine
supercharging

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Short Biography

Lecturer, Doctor engineer in internal combustion engines, specialist in alternative fuel use, in-cylinder process modeling and analysis, supercharging technology

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Journal article
Published: 28 December 2020 in Sustainability
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Hydrogen can be a viable alternative fuel for modern diesel engines, offering benefits on efficiency and performance improvement. The paper analyses the results of a thermodynamic model developed by authors in order to study the influence of Hydrogen addition on a process like vaporization, mixture forming, and combustion at the level of diesel fuel droplets. The bi-zonal model is applied for a dual-fueled diesel engine K9K type designed by Renault for automotives. For the engine operating regime of 2000 rpm speed and 55% engine load, the diesel fuel is partially substituted by Hydrogen in energetic percents of 6.76%, 13.39%, and 20.97%, the engine power being maintained at the same level comparative to classic fueling. At Hydrogen addition, the diesel fuel jets atomization and diesel fuel droplets vaporization are accelerated, the speed of formation of the mixture being increased. Comparative to classic fueling, the use of Hydrogen leads to diesel droplets combustion intensification, with a shortened autoignition delay, reduction of combustion duration, and increase of flame radius.

ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Gheorghe Lazaroiu; Cristian Nutu. The Influence of Hydrogen on Vaporization, Mixture Formation and Combustion of Diesel Fuel at an Automotive Diesel Engine. Sustainability 2020, 13, 202 .

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Gheorghe Lazaroiu, Cristian Nutu. The Influence of Hydrogen on Vaporization, Mixture Formation and Combustion of Diesel Fuel at an Automotive Diesel Engine. Sustainability. 2020; 13 (1):202.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Gheorghe Lazaroiu; Cristian Nutu. 2020. "The Influence of Hydrogen on Vaporization, Mixture Formation and Combustion of Diesel Fuel at an Automotive Diesel Engine." Sustainability 13, no. 1: 202.

Journal article
Published: 10 November 2020 in Sustainability
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Considering the current environmental restrictions, particularly those imposed on fossil fuel exploitation, hydrogen stands out as a very promising alternative for the power and transportation sectors. This paper investigates the effects of the employment of hydrogen in a K9K automotive diesel engine. Experiments were conducted at a speed of 2000 min−1 with various engine load levels of 40%, 55%, 70%, and 85%; several quantities were monitored to evaluate the performance with hydrogen use in terms of brake-specific energetic consumption (BSEC), fuel economy, maximum pressure, and heat-release characteristics. It was found that at 55% engine load, the engine efficiency increased by 5.3% with hydrogen addition, achieving a diesel fuel economy of 1.32 kg/h. The rate of increase of the peak pressure and maximum pressure started to increase as a consequence of the higher fuel quantity that burned in the premixed combustion phase, while still remaining within reliable operational limits. The accelerated combustion and augmented heat release rate resulted in a combustion duration that was reduced by 3° CA (crank angle degree), achieving a mass fraction burned percentage of 10% to 90% earlier in the cycle, and the combustion variability was also influenced. Hydrogen use assured the decrease of CO2, HC, NOx, and smoke emission levels in comparison with classic fueling.

ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Gheorghe Lazaroiu; Cristian Nutu; Dinu Fuiorescu. Hydrogen—An Alternative Fuel for Automotive Diesel Engines Used in Transportation. Sustainability 2020, 12, 9321 .

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Gheorghe Lazaroiu, Cristian Nutu, Dinu Fuiorescu. Hydrogen—An Alternative Fuel for Automotive Diesel Engines Used in Transportation. Sustainability. 2020; 12 (22):9321.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Gheorghe Lazaroiu; Cristian Nutu; Dinu Fuiorescu. 2020. "Hydrogen—An Alternative Fuel for Automotive Diesel Engines Used in Transportation." Sustainability 12, no. 22: 9321.

Journal article
Published: 11 December 2018 in Energies
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Leather processing for commercial purposes involves going through a set of complex and laborious operations, resulting in over 70% waste relative to the initial feedstock; a quarter of this waste is produced in Europe. Worldwide there are about 36,000 companies active in this sector, generating a turnover of almost 48 billion euros. As in any industrial sector, waste recovery is a highly researched topic, with alternatives for its use being constantly considered. One of the most interesting solutions to this problem consists of using part of the waste for power applications. For instance, the 10% fats from total animal waste could well be employed to power diesel engines, both in raw state or as biodiesel. The remainder, which contains mostly proteins, can be exploited to obtain biogas through anaerobic digestion. This paper presents the results of experimental determinations on the combustion of animal fats and compares it to other biofuels, such as vegetable oils and solid biomass. The advantages of co-firing hydrogen-rich gas (HRG) and vegetable biomass are also analyzed. According to the presented results, combustion of the investigated fuels has a lower impact on the environment, with the concentration of pollutants in the flue gases being low. Thus, the paper proves that all the proposed solutions are ecological alternatives for biomass exploitation for energy recovery purposes, based on comparing the results in terms of pollutant emissions. This paper provides qualitative and quantitative perspectives on multiple alternatives of energy recovery from biomass resources, while also briefly describing the methods and equipment used to this end.

ACS Style

Gheorghe Lazaroiu; Lucian Mihaescu; Gabriel Negreanu; Constantin Pana; Ionel Pisa; Alexandru Cernat; Dana-Alexandra Ciupageanu. Experimental Investigations of Innovative Biomass Energy Harnessing Solutions. Energies 2018, 11, 3469 .

AMA Style

Gheorghe Lazaroiu, Lucian Mihaescu, Gabriel Negreanu, Constantin Pana, Ionel Pisa, Alexandru Cernat, Dana-Alexandra Ciupageanu. Experimental Investigations of Innovative Biomass Energy Harnessing Solutions. Energies. 2018; 11 (12):3469.

Chicago/Turabian Style

Gheorghe Lazaroiu; Lucian Mihaescu; Gabriel Negreanu; Constantin Pana; Ionel Pisa; Alexandru Cernat; Dana-Alexandra Ciupageanu. 2018. "Experimental Investigations of Innovative Biomass Energy Harnessing Solutions." Energies 11, no. 12: 3469.

Journal article
Published: 01 January 2018 in Thermal Science
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ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Dinu Fuiorescu; Cristian Nutu; Ionel Mirica. Experimental aspects of hydrogen use at diesel engine by diesel gas method. Thermal Science 2018, 22, 1385 -1394.

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Dinu Fuiorescu, Cristian Nutu, Ionel Mirica. Experimental aspects of hydrogen use at diesel engine by diesel gas method. Thermal Science. 2018; 22 (3):1385-1394.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Dinu Fuiorescu; Cristian Nutu; Ionel Mirica. 2018. "Experimental aspects of hydrogen use at diesel engine by diesel gas method." Thermal Science 22, no. 3: 1385-1394.

Conference paper
Published: 03 July 2017 in MATEC Web of Conferences
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MATEC Web of Conferences, open access proceedings in Materials science, Engineering and Chemistry

ACS Style

Liviu Nemoianu; Constantin Pana; Niculae Negurescu; Alexandru Cernat; Dinu Fuiorescu; Cristian Nutu. Study of the cycle variability at an automotive diesel engine fuelled with LPG. MATEC Web of Conferences 2017, 112, 10006 .

AMA Style

Liviu Nemoianu, Constantin Pana, Niculae Negurescu, Alexandru Cernat, Dinu Fuiorescu, Cristian Nutu. Study of the cycle variability at an automotive diesel engine fuelled with LPG. MATEC Web of Conferences. 2017; 112 ():10006.

Chicago/Turabian Style

Liviu Nemoianu; Constantin Pana; Niculae Negurescu; Alexandru Cernat; Dinu Fuiorescu; Cristian Nutu. 2017. "Study of the cycle variability at an automotive diesel engine fuelled with LPG." MATEC Web of Conferences 112, no. : 10006.

Conference paper
Published: 03 July 2017 in MATEC Web of Conferences
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The liquefied petroleum gas has a great potential to improve energetically and pollution performance of compression ignition engines due to its good combustion properties. This paper presents results of the researches carried on a car compression ignition engine with a 1.5 dm3 displacement, fuelled with diesel fuel and liquefied petroleum gas by diesel-gas method at the operating regimens of 70% and 55% engine load, engine speed of 2000 rpm and for substitute ratios between (6–19)%. A specific objective of this paper is to establish a correlation between the optimum adjustments and the substitute ratio of the diesel fuel with liquefied petroleum gas for the investigated regimens to limit the maximum pressure and smoke level, knock and rough engine functioning and having regard to decrease the fuel consumption and the level of the pollutant emissions.

ACS Style

Cristian Nutu; Constantin Pana; Niculae Negurescu; Ionel Mirica; Alexandru Cernat. Experimental investigations of LPG use at the automotive diesel engine. MATEC Web of Conferences 2017, 112, 10003 .

AMA Style

Cristian Nutu, Constantin Pana, Niculae Negurescu, Ionel Mirica, Alexandru Cernat. Experimental investigations of LPG use at the automotive diesel engine. MATEC Web of Conferences. 2017; 112 ():10003.

Chicago/Turabian Style

Cristian Nutu; Constantin Pana; Niculae Negurescu; Ionel Mirica; Alexandru Cernat. 2017. "Experimental investigations of LPG use at the automotive diesel engine." MATEC Web of Conferences 112, no. : 10003.

Conference paper
Published: 01 November 2016 in CONAT 2016 International Congress of Automotive and Transport Engineering
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Efficiency improves and pollutant emissions decrease of the automotive diesel engine can be assured by Liquid Petroleum Gas fuelling. Paper target is the study of cycle variability at LPG fuelling, which shows new, important, considerable implication and effects of LPG use at diesel engine, completing the general experimental investigation of engine running at fuelling with alternative fuel for a clean environmental. The K9K EURO 4 diesel engine was mounted on the test bed, equipped with instrumentation and fuelled with LPG by diesel gas method. The investigated engine operating regimes were 55 % and 70 % load at speed of 2000 rpm, at fuelling with diesel fuel and LPG at different substitute ratios. The increase of LPG cycle dose leads to the increase of cycle maximum pressure and maximum pressure cycle dispersion, thus the dispersion of successive running cycle’s increases. This fact may become a limitation criterion for the LPG substitute ratio value.

ACS Style

Liviu Nemoianu; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. Study of the Diesel Engine Cycle Variability at LPG Fuelling. CONAT 2016 International Congress of Automotive and Transport Engineering 2016, 371 -378.

AMA Style

Liviu Nemoianu, Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. Study of the Diesel Engine Cycle Variability at LPG Fuelling. CONAT 2016 International Congress of Automotive and Transport Engineering. 2016; ():371-378.

Chicago/Turabian Style

Liviu Nemoianu; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2016. "Study of the Diesel Engine Cycle Variability at LPG Fuelling." CONAT 2016 International Congress of Automotive and Transport Engineering , no. : 371-378.

Conference paper
Published: 01 November 2016 in CONAT 2016 International Congress of Automotive and Transport Engineering
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The use of hydrogen at the diesel engines for improvement energetic and ecologic their performance is the main objective of the paper. The research work has been carried out on truck diesel engine at the 55 % load and 1400 rpm. The engine was fuelled firstly with diesel fuel, then with diesel fuel and hydrogen at different rates between 11–40 L/min. The minimum brake specific energetic consumption decreases with ~9 % and NOx emission decreases with 5.5 % due to combustion improvement at the hydrogen use. The engine energetic and ecologic performances are improved.

ACS Style

Ionel Mirica; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. Aspects of Experimental Research on Hydrogen Fuelled Automotive Diesel Engine. CONAT 2016 International Congress of Automotive and Transport Engineering 2016, 427 -434.

AMA Style

Ionel Mirica, Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. Aspects of Experimental Research on Hydrogen Fuelled Automotive Diesel Engine. CONAT 2016 International Congress of Automotive and Transport Engineering. 2016; ():427-434.

Chicago/Turabian Style

Ionel Mirica; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2016. "Aspects of Experimental Research on Hydrogen Fuelled Automotive Diesel Engine." CONAT 2016 International Congress of Automotive and Transport Engineering , no. : 427-434.

Journal article
Published: 01 January 2016 in Procedia Technology
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The Liquid Petroleum Gas can be use at diesel engine with significant reductions in nitrous oxides and smoke emissions and affects the in-cylinder mixture forming and combustion process. The paper presents the results of a thermodynamic model developed for vaporization and combustion processes simulation for an automotive diesel engine fuelled with LPG by diesel gas method. The mass flow of vaporized substance at the particle area, drops combustion time and flame position are determinate, showing a significant influence of LPG cycle dose on their characteristic parameters. The drops combustion duration decreases for dual fuelling and the flame radius increases.

ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. On Combustion of Diesel Fuel Drops at LPG Fuelling by Diesel Gas Method. Procedia Technology 2016, 22, 705 -712.

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. On Combustion of Diesel Fuel Drops at LPG Fuelling by Diesel Gas Method. Procedia Technology. 2016; 22 ():705-712.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2016. "On Combustion of Diesel Fuel Drops at LPG Fuelling by Diesel Gas Method." Procedia Technology 22, no. : 705-712.

Journal article
Published: 01 January 2016 in Procedia Technology
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Liquid Petroleum Gas physic-chemical properties lead to specific aspects of the in-cylinder combustion and mechanical running of diesel engines. Comparative to the classic diesel engine, the cycle variability coefficients (COV) are presented at dual fuelling for maximum pressure, maximum pressure rise rate, maximum pressure angle, indicated mean effective pressure, heat release rate and cycle angle points of mass fraction burned. The calculated values of these parameters are bigger comparative to the normal values of diesel engines, but don’t exceed the maximum admitted values that provide engine reliability. From COV values analysis, the maximum admitted LPG cycle dose is also established.

ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. The Influence of LPG Fuelling on Diesel Engine Cycle Variability. Procedia Technology 2016, 22, 746 -753.

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. The Influence of LPG Fuelling on Diesel Engine Cycle Variability. Procedia Technology. 2016; 22 ():746-753.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2016. "The Influence of LPG Fuelling on Diesel Engine Cycle Variability." Procedia Technology 22, no. : 746-753.

Journal article
Published: 01 January 2016 in Procedia Technology
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The reduction of pollutant emissions from the automotive exhaust gases by using alternative fuels becomes a priority. The paper presents the preliminary results of cycle variability study for an aspirated spark ignition engine converted to turbo-supercharging and bioethanol fuelling for three areas of air-fuel ratio operating regimes, rich, stoichiometric and lean dosages. The influence of bioethanol content in blends with gasoline on cycle variability of the combustion process is reflected in the calculated values of the cycle variability coefficients. The cycle variability decreases at E20 use comparative to gasoline.

ACS Style

Zuhair H. Obeid; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. Influence of E20 Fuelling on Combustion Cycle Variability at Turbocharged Spark Ignition Engine. Procedia Technology 2016, 22, 762 -766.

AMA Style

Zuhair H. Obeid, Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. Influence of E20 Fuelling on Combustion Cycle Variability at Turbocharged Spark Ignition Engine. Procedia Technology. 2016; 22 ():762-766.

Chicago/Turabian Style

Zuhair H. Obeid; Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2016. "Influence of E20 Fuelling on Combustion Cycle Variability at Turbocharged Spark Ignition Engine." Procedia Technology 22, no. : 762-766.

Journal article
Published: 01 November 2015 in Applied Mechanics and Materials
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The Liquid Petroleum Gas can be use for diesel engine fuelling with significant result in term of pollutant emissions improvement, with important reduction of nitrous oxides and smoke for a LPG dual fuelled diesel engine. Beside this the LPG fuelling affects the combustion process inside the cylinder and also the mixture forming. High degree of homogeneity of the air-LPG mixtures will accelerate the in-cylinder mixture forming between air-LPG and diesel fuel jets, since the LPG-air mixture combustion starts. The paper presents the results of a zero-dimensional, one-zone thermodynamic model developed by authors for diesel fuel jets vaporization and combustion at dual fuelling. The model shows the diesel fuel jet characteristic, the break-up period, the mass flow of vaporized substance on the particle surface, drops vaporization time, air-fuel mixture forming speed, drops combustion time and flame position, showing a significant influence of LPG cycle dose on their characteristic parameters. The drops vaporization and combustion duration decrease for dual fuelling and the flame radius increases. Thus, based on the experimental data, an evaluation model for mixture forming was developed for an automotive diesel engine fuelled with LPG and diesel fuel by diesel-gas method.

ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu. Aspects of in-Cylinder Mixture Formation Study for a Diesel Engine Fuelled with LPG by Diesel-Gas Method. Applied Mechanics and Materials 2015, 809-810, 1043 -1048.

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu. Aspects of in-Cylinder Mixture Formation Study for a Diesel Engine Fuelled with LPG by Diesel-Gas Method. Applied Mechanics and Materials. 2015; 809-810 ():1043-1048.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu. 2015. "Aspects of in-Cylinder Mixture Formation Study for a Diesel Engine Fuelled with LPG by Diesel-Gas Method." Applied Mechanics and Materials 809-810, no. : 1043-1048.

Journal article
Published: 01 August 2015 in Energy Procedia
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ACS Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. On Vaporization of a Single Droplet of Diesel Fuel at LPG Fuelled Engine by Diesel-Gas Method. Energy Procedia 2015, 74, 1306 -1313.

AMA Style

Alexandru Cernat, Constantin Pana, Niculae Negurescu, Cristian Nutu. On Vaporization of a Single Droplet of Diesel Fuel at LPG Fuelled Engine by Diesel-Gas Method. Energy Procedia. 2015; 74 ():1306-1313.

Chicago/Turabian Style

Alexandru Cernat; Constantin Pana; Niculae Negurescu; Cristian Nutu. 2015. "On Vaporization of a Single Droplet of Diesel Fuel at LPG Fuelled Engine by Diesel-Gas Method." Energy Procedia 74, no. : 1306-1313.

Journal article
Published: 01 October 2014 in Applied Mechanics and Materials
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The severe legislation regarding pollution from actual time determine us to find new alternative solutions for diesel engine fuelling. This paper objective is the use of LPG as alternative fuel at a diesel engine in the purpose of pollutant emissions level decreasing in general and especially of NOx and smoke emissions. Is difficult to use LPG as single fuel at the diesel engine because it has an high auto ignition endurance (CN = -3). There are many fuelling methods of the diesel engine with LPG, but the authors of this paper used the diesel-gas method for a 1,5 l engine fuelling. The research followed the establishment of the optimal LPG cyclic dose and the diesel engine adjustments for different engine operating regimen. The paper presents results of some theoretical and experimental investigations of the LPG fuelled diesel engine. Three substitute ratios of diesel fuel with LPG were taken into account for full load and 2000 rpm engine speed. Thus, the NOx emissions decreased with 20-28 % for different substitute ratios of diesel fuel with LPG. The smoke emission decreased with 35-47% for same substitute ratios. LPG fuelling represents a very good solution for a cleaner environment.

ACS Style

Nikolaos Cristian Nutu; Constantin Pana; Alexandru Dobre; Niculae Negurescu; Alexandru Cernat. Experimental and Theoretical Aspects of Fuelling a Diesel Engine with Liquefied Petroleum Gases. Applied Mechanics and Materials 2014, 659, 211 -216.

AMA Style

Nikolaos Cristian Nutu, Constantin Pana, Alexandru Dobre, Niculae Negurescu, Alexandru Cernat. Experimental and Theoretical Aspects of Fuelling a Diesel Engine with Liquefied Petroleum Gases. Applied Mechanics and Materials. 2014; 659 ():211-216.

Chicago/Turabian Style

Nikolaos Cristian Nutu; Constantin Pana; Alexandru Dobre; Niculae Negurescu; Alexandru Cernat. 2014. "Experimental and Theoretical Aspects of Fuelling a Diesel Engine with Liquefied Petroleum Gases." Applied Mechanics and Materials 659, no. : 211-216.

Journal article
Published: 01 October 2014 in Applied Mechanics and Materials
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Due to the increasing growth of fuel consumption and also its price, alcohols begin to show a real interest for their use as fuel at compression ignition engines. Tightening the requirements on reducing the level of pollutant emissions and greenhouse effect gases has led to the increasing of research on using alcohols as alternative fuel for diesel engine. Among the primary alcohols, butyl alcohol (butanol) is considered to be of great perspective in its use as fuel in diesel engines, due to its properties close to those of diesel fuel. The overall objective of the paper represents using butanol at an automotive diesel engine in order to reduce BSFC, to reduce engine emissions and replace fossil fuels. This paper presents some aspects of the operation of diesel engine fuelled with blends of diesel fuel and butanol. Results of theoretical and experimental investigations done on a 1.5 L diesel engine fuelled with butanol are presented. At the use of butanol in mixture with diesel fuel in different proportions (10% and 20% butanol vol.), brake specific energetic consumption of the engine was reduced by about 2.5% and respectively 5%, NOx emissions decreased by about 15% and respectively 20%, CO2 emission by about 5% for 20% butanol, at the engine running at full load and maximum torque engine speed. The results of experimental investigations have validated the physical-mathematical model used for the simulation of thermo-gas-dynamics processes from the inside engine cylinder. The paper brings real contributions in the field making available to specialists new information related to the use of butanol at the diesel engines.

ACS Style

Alexandru Dobre; Constantin Pana; Nikolaos Cristian Nutu; Niculae Negurescu; Alexandru Cernat. Theoretical and Experimental Researches Regarding the Use of Butanol at Diesel Engine. Applied Mechanics and Materials 2014, 659, 183 -188.

AMA Style

Alexandru Dobre, Constantin Pana, Nikolaos Cristian Nutu, Niculae Negurescu, Alexandru Cernat. Theoretical and Experimental Researches Regarding the Use of Butanol at Diesel Engine. Applied Mechanics and Materials. 2014; 659 ():183-188.

Chicago/Turabian Style

Alexandru Dobre; Constantin Pana; Nikolaos Cristian Nutu; Niculae Negurescu; Alexandru Cernat. 2014. "Theoretical and Experimental Researches Regarding the Use of Butanol at Diesel Engine." Applied Mechanics and Materials 659, no. : 183-188.

Journal article
Published: 01 October 2014 in Applied Mechanics and Materials
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The general objective of the researches is use of bioethanol at the supercharged spark ignition engine for improving engine efficiency, improving performance of power and torque and decreasing of the emissions level. Bioethanol is a very good alternative fuel for supercharged SI engines because of its better combustion proprieties comparative to the gasoline; it has a higher combustion velocity, a high resistance to the combustion with knock and can be used and as a cooling agent of the intake air. By achieving these specific objectives this paper brings important contributions to improvement the SI engines performance. The paper presents results of some theoretical and experimental investigations on a 1.5 L supercharged SI engine fuelled with gasoline-bioethanol blends. At the theoretical research, the physical – mathematical model uses a Vibe combustion formal law and for combustion with knock avoiding the combustion duration is established shorter than end-gas auto ignition delay evaluated by Douaud and Evzat equation. Is established an optimum correlation between the engine air boost pressure, spark ignition timing, dosage, air boost temperature and energetic performance for to the avoiding of knocking phenomena. The theoretical and experimental investigations show that the improvement of the combustion process by use the bioethanol at the supercharged spark ignition engine leads to the reduction of BSFC (with 5% at the stoichiometric dosage), to the accentuated reduction CO and HC (with 5% and 13% respectively at the same dosage), due to a lower C content and better combustion properties of the bioethanol. In same time, the NOx emissions level significantly decreases (with 7% at the same dosage) because of the local cooling effect produced by bioethanol vaporization.

ACS Style

Zuhair H. Obeid Obeid; Constantin Pana; Niculae Negurescu; Alexandru Cernat. Researches Regarding the Use of Bioethanol at the Supercharged Spark Ignition Engine. Applied Mechanics and Materials 2014, 659, 217 -222.

AMA Style

Zuhair H. Obeid Obeid, Constantin Pana, Niculae Negurescu, Alexandru Cernat. Researches Regarding the Use of Bioethanol at the Supercharged Spark Ignition Engine. Applied Mechanics and Materials. 2014; 659 ():217-222.

Chicago/Turabian Style

Zuhair H. Obeid Obeid; Constantin Pana; Niculae Negurescu; Alexandru Cernat. 2014. "Researches Regarding the Use of Bioethanol at the Supercharged Spark Ignition Engine." Applied Mechanics and Materials 659, no. : 217-222.

Book chapter
Published: 07 November 2012 in Lecture Notes in Electrical Engineering
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The general objective of this paper is application of the supercharging method and bioethanol use at the spark ignition engine for improving performance of power and torque, improving engine efficiency, decrease of the emissions level and increases of the engine specific power. The paper brings an important contribution to pollution problems solving in large urban areas, the solution can being easily implemented on spark ignition engines in running, even on the old designs which can be converted to fit the current rules of pollution. A modern method to increase efficiency and specific power of the spark ignition engines is supercharging. Supercharging is common for diesel engines, but for SI engines becomes restrictive because of the main disadvantages represented by abnormal combustion phenomena with knock, exhaust gases temperature increasing, engine thermal and mechanical stresses increasing. By using modern control methods of the combustion, supercharging becomes an efficient method even for SI engine. The theoretical and experimental investigations were performed on a 1.5L aspirated spark ignition engine with MP injection which was supercharged. The supercharged engine was fuelled with gasoline-bioethanol blends. The use of bioethanol at supercharged SI engine assures an efficient cooling effect of the intake air due to its higher heat of vaporization. The intake air cooling effect leads to a volumetric efficiency increasing and the knock appearance risk is reduced. For to achieve of the research objectives the following methodology was used: modelling of the thermo-gas-dynamics processes inside engine cylinder for the theoretical evaluation of engine energetic performance; experimental investigations carrying out on the test bed of the SI engine in two versions: aspirated engine and supercharged engine fuelled with gasoline- bioethanol blends, respectively. For to achieve of the research objectives the following methodology was used: modelling of the thermo-gas-dynamics processes inside engine cylinder for the theoretical evaluation of energetic and pollution performance for aspirated engine and also for of the supercharged engine fuelled with gasoline-bioethanol blends in order to decrease the experimental investigations volume; experimental investigations carrying out on the test bed of the SI engine in two versions: aspirated engine and supercharged engine fuelled with gasoline-bioethanol blends, respectively; the interfacing of the electronic control units for the supercharged spark ignition engine fuelled with gasoline- bioethanol blends. The obtained results of the research are: development of a physic-mathematical model to simulate thermo-gas-dynamics processes inside engine cylinder; determining the bioethanol influences on the engine cylinder filling; determining the bioethanol influences on the supercharged spark-ignition engine combustion process; engine efficiency increasing by up to 10 %, specific power increasing by up to 33 %, pollutant emission levels reduction (was obtained a reduction of 20 % for NOx emissions, a 10 % reduction of CO emission and a 13 % reduction of HC emission); establishing the optimal correlation between dosage—electric spark advance—boost pressure—exhaust gases temperature—coefficient of excess air on one hand and functional regime of the engine on the other hand. The abnormal combustion phenomena with knock study in this paper were not developed. As a research novelty is the solution for use of gasoline- bioethanol blends at the supercharging SI engine. Original elements of the research are: application of the supercharging procedure to an aspirated car spark ignition engine; use of gasoline- bioethanol blends as an injected fuel in blower downstream with effect of cooling the compressed air. The SI engine supercharging and use of gasoline- bioethanol blends is a good method to efficiency and power performance increasing. The pollutant emissions level decreases due to the improvement of the combustion processes. Bioethanol can be considered as an efficient anti-knock agent.

ACS Style

Constantin Pana; Niculae Negurescu; Alexandru Cernat. Improvement of the Automotive Spark Ignition Engine Performance by Supercharging and the Bioethanol Use. Lecture Notes in Electrical Engineering 2012, 27 -36.

AMA Style

Constantin Pana, Niculae Negurescu, Alexandru Cernat. Improvement of the Automotive Spark Ignition Engine Performance by Supercharging and the Bioethanol Use. Lecture Notes in Electrical Engineering. 2012; ():27-36.

Chicago/Turabian Style

Constantin Pana; Niculae Negurescu; Alexandru Cernat. 2012. "Improvement of the Automotive Spark Ignition Engine Performance by Supercharging and the Bioethanol Use." Lecture Notes in Electrical Engineering , no. : 27-36.

Journal article
Published: 01 January 2011 in Thermal Science
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Due to its combustion properties, the hydrogen has a great potential in energetic improvement and emission performance of spark ignition (SI) engine. In this respect, the paper presents comparative results of the experimental researches carried on SI single cylinder engine fuelled with gasoline or only hydrogen, at some engine speeds and full load. Direct injection hydrogen fuelled engine power is greater with almost 30% comparative to gasoline engine due to cycle heat release increasing. The hydrogen direct injection method in the engine cylinder at the beginning of the compression stroke after the intake valve closed has been chosen to avoid reducing the power output per litre. Using this fuelling method was possible to avoid the uncontrolled burning process for all engine operating regimes. Hydrogen supply system used is original and offers great flexibility in operation to establish the adjustments. The obtained results show that the engine fuelled with hydrogen offers the possibility of qualitative load adjustment using for the engine performance improvement especially at partial loads. The paper presents a strategy for combining qualitative and quantitative setting adjustment in order to optimize engine operation at all regimens.

ACS Style

Niculae Negurescu; Constantin Pana; Marcel Popa; Alexandru Cernat. Performance comparison between hydrogen and gasoline fuelled S.I. engine. Thermal Science 2011, 15, 1155 -1164.

AMA Style

Niculae Negurescu, Constantin Pana, Marcel Popa, Alexandru Cernat. Performance comparison between hydrogen and gasoline fuelled S.I. engine. Thermal Science. 2011; 15 (4):1155-1164.

Chicago/Turabian Style

Niculae Negurescu; Constantin Pana; Marcel Popa; Alexandru Cernat. 2011. "Performance comparison between hydrogen and gasoline fuelled S.I. engine." Thermal Science 15, no. 4: 1155-1164.