The Experts below are selected from a list of 5895 Experts worldwide ranked by ideXlab platform
Adrian Birtas - One of the best experts on this subject based on the ideXlab platform.
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lean mixture operation of a passenger car gasoline engine ignited by passively q switched nd yag cr 4 yag laser Spark Plugs
European Quantum Electronics Conference, 2019Co-Authors: N Pavel, Niculae Boicea, Adrian Birtas, Radu Chiriac, Florin Draghici, Gabriela Croitoru, Mihai P DincaAbstract:Increasing human concern on the environment impact of the present internal combustion engines motivates the research for methods, techniques or even new concepts and technical solutions that could improve the engines performances. A promising technique for reduction of both fuel consumption and exhaust gas emissions in automotive engines is the operation by laser ignition (LI) [1]. For the first time, LI was used by Dale et al. in 1978 to run a one-cylinder ASTM-CFR engine [2] whereas LI of a four-cylinder Ford Mondeo engine was first achieved by Mullet et al. in 2008 [3]. More recently, based on development of compact laser Spark Plugs (LSP), similar to classical Spark Plugs (CSP), LI was successfully applied to operate real vehicles, by T. Taira et al. in 2013 [4] and by our research teams in 2015–2017 [5,6]. The results proved increased engine combustion stability [4,5] under LI in comparison with CSP ignition. However, there are still few experimental data, while investigations were done mainly at stoichiometric λ∼1 air-fuel mixture; furthermore, even fewer results are available regarding the exhaust emissions. In this work we report on LI of a four-stroke, four-cylinder, multipoint fuel injection gasoline passenger car engine that was operated at lean air-fuel mixtures using LI with high-peak power, passively Q-switched Nd:YAG/Cr4+:YAG LSP compact devices.
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ignition of an automobile engine by high peak power nd yag cr yag laser Spark devices
Optics Express, 2015Co-Authors: N Pavel, Gabriela Salamu, Niculae Boicea, Traian Dascalu, Mihai P Dinca, Adrian BirtasAbstract:Laser Sparks that were built with high-peak power passively Q-switched Nd:YAG/Cr4+:YAG lasers have been used to operate a Renault automobile engine. The design of such a laser Spark igniter is discussed. The Nd:YAG/Cr4+:YAG laser delivered pulses with energy of 4 mJ and 0.8-ns duration, corresponding to pulse peak power of 5 MW. The coefficients of variability of maximum pressure (COVPmax) and of indicated mean effective pressure (COVIMEP) and specific emissions like hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO2) were measured at various engine speeds and high loads. Improved engine stability in terms of COVPmax and COVPmax and decreased emissions of CO and HC were obtained for the engine that was run by laser Sparks in comparison with classical ignition by electrical Spark Plugs.
N Pavel - One of the best experts on this subject based on the ideXlab platform.
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lean mixture operation of a passenger car gasoline engine ignited by passively q switched nd yag cr 4 yag laser Spark Plugs
European Quantum Electronics Conference, 2019Co-Authors: N Pavel, Niculae Boicea, Adrian Birtas, Radu Chiriac, Florin Draghici, Gabriela Croitoru, Mihai P DincaAbstract:Increasing human concern on the environment impact of the present internal combustion engines motivates the research for methods, techniques or even new concepts and technical solutions that could improve the engines performances. A promising technique for reduction of both fuel consumption and exhaust gas emissions in automotive engines is the operation by laser ignition (LI) [1]. For the first time, LI was used by Dale et al. in 1978 to run a one-cylinder ASTM-CFR engine [2] whereas LI of a four-cylinder Ford Mondeo engine was first achieved by Mullet et al. in 2008 [3]. More recently, based on development of compact laser Spark Plugs (LSP), similar to classical Spark Plugs (CSP), LI was successfully applied to operate real vehicles, by T. Taira et al. in 2013 [4] and by our research teams in 2015–2017 [5,6]. The results proved increased engine combustion stability [4,5] under LI in comparison with CSP ignition. However, there are still few experimental data, while investigations were done mainly at stoichiometric λ∼1 air-fuel mixture; furthermore, even fewer results are available regarding the exhaust emissions. In this work we report on LI of a four-stroke, four-cylinder, multipoint fuel injection gasoline passenger car engine that was operated at lean air-fuel mixtures using LI with high-peak power, passively Q-switched Nd:YAG/Cr4+:YAG LSP compact devices.
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ignition of an automobile engine by high peak power nd yag cr yag laser Spark devices
Optics Express, 2015Co-Authors: N Pavel, Gabriela Salamu, Niculae Boicea, Traian Dascalu, Mihai P Dinca, Adrian BirtasAbstract:Laser Sparks that were built with high-peak power passively Q-switched Nd:YAG/Cr4+:YAG lasers have been used to operate a Renault automobile engine. The design of such a laser Spark igniter is discussed. The Nd:YAG/Cr4+:YAG laser delivered pulses with energy of 4 mJ and 0.8-ns duration, corresponding to pulse peak power of 5 MW. The coefficients of variability of maximum pressure (COVPmax) and of indicated mean effective pressure (COVIMEP) and specific emissions like hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO2) were measured at various engine speeds and high loads. Improved engine stability in terms of COVPmax and COVPmax and decreased emissions of CO and HC were obtained for the engine that was run by laser Sparks in comparison with classical ignition by electrical Spark Plugs.
Mihai P Dinca - One of the best experts on this subject based on the ideXlab platform.
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lean mixture operation of a passenger car gasoline engine ignited by passively q switched nd yag cr 4 yag laser Spark Plugs
European Quantum Electronics Conference, 2019Co-Authors: N Pavel, Niculae Boicea, Adrian Birtas, Radu Chiriac, Florin Draghici, Gabriela Croitoru, Mihai P DincaAbstract:Increasing human concern on the environment impact of the present internal combustion engines motivates the research for methods, techniques or even new concepts and technical solutions that could improve the engines performances. A promising technique for reduction of both fuel consumption and exhaust gas emissions in automotive engines is the operation by laser ignition (LI) [1]. For the first time, LI was used by Dale et al. in 1978 to run a one-cylinder ASTM-CFR engine [2] whereas LI of a four-cylinder Ford Mondeo engine was first achieved by Mullet et al. in 2008 [3]. More recently, based on development of compact laser Spark Plugs (LSP), similar to classical Spark Plugs (CSP), LI was successfully applied to operate real vehicles, by T. Taira et al. in 2013 [4] and by our research teams in 2015–2017 [5,6]. The results proved increased engine combustion stability [4,5] under LI in comparison with CSP ignition. However, there are still few experimental data, while investigations were done mainly at stoichiometric λ∼1 air-fuel mixture; furthermore, even fewer results are available regarding the exhaust emissions. In this work we report on LI of a four-stroke, four-cylinder, multipoint fuel injection gasoline passenger car engine that was operated at lean air-fuel mixtures using LI with high-peak power, passively Q-switched Nd:YAG/Cr4+:YAG LSP compact devices.
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ignition of an automobile engine by high peak power nd yag cr yag laser Spark devices
Optics Express, 2015Co-Authors: N Pavel, Gabriela Salamu, Niculae Boicea, Traian Dascalu, Mihai P Dinca, Adrian BirtasAbstract:Laser Sparks that were built with high-peak power passively Q-switched Nd:YAG/Cr4+:YAG lasers have been used to operate a Renault automobile engine. The design of such a laser Spark igniter is discussed. The Nd:YAG/Cr4+:YAG laser delivered pulses with energy of 4 mJ and 0.8-ns duration, corresponding to pulse peak power of 5 MW. The coefficients of variability of maximum pressure (COVPmax) and of indicated mean effective pressure (COVIMEP) and specific emissions like hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO2) were measured at various engine speeds and high loads. Improved engine stability in terms of COVPmax and COVPmax and decreased emissions of CO and HC were obtained for the engine that was run by laser Sparks in comparison with classical ignition by electrical Spark Plugs.
Niculae Boicea - One of the best experts on this subject based on the ideXlab platform.
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lean mixture operation of a passenger car gasoline engine ignited by passively q switched nd yag cr 4 yag laser Spark Plugs
European Quantum Electronics Conference, 2019Co-Authors: N Pavel, Niculae Boicea, Adrian Birtas, Radu Chiriac, Florin Draghici, Gabriela Croitoru, Mihai P DincaAbstract:Increasing human concern on the environment impact of the present internal combustion engines motivates the research for methods, techniques or even new concepts and technical solutions that could improve the engines performances. A promising technique for reduction of both fuel consumption and exhaust gas emissions in automotive engines is the operation by laser ignition (LI) [1]. For the first time, LI was used by Dale et al. in 1978 to run a one-cylinder ASTM-CFR engine [2] whereas LI of a four-cylinder Ford Mondeo engine was first achieved by Mullet et al. in 2008 [3]. More recently, based on development of compact laser Spark Plugs (LSP), similar to classical Spark Plugs (CSP), LI was successfully applied to operate real vehicles, by T. Taira et al. in 2013 [4] and by our research teams in 2015–2017 [5,6]. The results proved increased engine combustion stability [4,5] under LI in comparison with CSP ignition. However, there are still few experimental data, while investigations were done mainly at stoichiometric λ∼1 air-fuel mixture; furthermore, even fewer results are available regarding the exhaust emissions. In this work we report on LI of a four-stroke, four-cylinder, multipoint fuel injection gasoline passenger car engine that was operated at lean air-fuel mixtures using LI with high-peak power, passively Q-switched Nd:YAG/Cr4+:YAG LSP compact devices.
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ignition of an automobile engine by high peak power nd yag cr yag laser Spark devices
Optics Express, 2015Co-Authors: N Pavel, Gabriela Salamu, Niculae Boicea, Traian Dascalu, Mihai P Dinca, Adrian BirtasAbstract:Laser Sparks that were built with high-peak power passively Q-switched Nd:YAG/Cr4+:YAG lasers have been used to operate a Renault automobile engine. The design of such a laser Spark igniter is discussed. The Nd:YAG/Cr4+:YAG laser delivered pulses with energy of 4 mJ and 0.8-ns duration, corresponding to pulse peak power of 5 MW. The coefficients of variability of maximum pressure (COVPmax) and of indicated mean effective pressure (COVIMEP) and specific emissions like hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO2) were measured at various engine speeds and high loads. Improved engine stability in terms of COVPmax and COVPmax and decreased emissions of CO and HC were obtained for the engine that was run by laser Sparks in comparison with classical ignition by electrical Spark Plugs.
Dieter Brüggemann - One of the best experts on this subject based on the ideXlab platform.
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pulse train ignition with passively q switched laser Spark Plugs under engine like conditions
International Conference on Ignition Systems for Gasoline Engines, 2016Co-Authors: Sebastian Lorenz, Mark Bärwinkel, Wolfgang Mühlbauer, Dieter BrüggemannAbstract:Lean combustion and downsizing are two concepts to increase fuel efficiency and to reduce emissions of engines. However, the requirements on the ignition system increase consequently due to increased flow velocity and pressure at the time of ignition. In this context, the application of miniaturized passively q-switched laser Spark Plugs with pulse train operation provides an alternative to the conventional Spark plug. To exploit the full potential of the pulse trains, ignition and combustion processes induced by passively q-switched laser Spark Plugs are investigated in this study.
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Pulse train ignition with passively Q-switched laser Spark Plugs:
International Journal of Engine Research, 2015Co-Authors: Sebastian Lorenz, Mark Bärwinkel, Robert Stäglich, Wolfgang Mühlbauer, Dieter BrüggemannAbstract:Leaner burning and downsizing are two concepts pursued by engine developers to reduce fuel consumption and emissions. Both approaches lead to increasing challenges concerning ignition, as these concepts are typically associated with an increase in flow velocity and degree of turbulence as well as raised pressure at the moment of ignition. In this context, the use of miniaturized passively Q-switched laser Spark Plugs with pulse train ignition is considered as a promising alternative to conventional Spark Plugs.However, the application of these passively Q-switched laser Spark Plugs inevitably leads to the question of optimum pulse train parameters. For a better understanding, this study deals with improved flame formation by passively Q-switched laser pulse train ignition under engine-like conditions. The entire ignition process is investigated with a special focus on interactions of consecutive pulses. Therefore, three methods are combined: energy transfer measurements from laser pulse to plasma with hig...
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the influence of pulse trains on the ignition process of passively q switched laser Spark Plugs
Laser Ignition Conference (2015) paper W3A.6, 2015Co-Authors: Sebastian Lorenz, Mark Bärwinkel, Robert Stäglich, Wolfgang Mühlbauer, Peter Heinz, Dieter BrüggemannAbstract:The ignition process of different prototypes of passively Q-switched laser Spark Plugs was investigated. Energy transfer, plasma temperature, shock wave and flame kernel formation were analyzed considering the effect of laser pulse trains and fluid flow.
