The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Avinash Kumar Agarwal - One of the best experts on this subject based on the ideXlab platform.
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comparative study of laser Ignition and conventional electrical spark Ignition Systems in a hydrogen fuelled engine
International Journal of Hydrogen Energy, 2015Co-Authors: Anuj Pal, Avinash Kumar AgarwalAbstract:Abstract Increasing population and demand for fossil fuels is leading to rapid depletion of petroleum reserves. Hydrogen has great promise as an alternative fuel for powering next generation internal combustion engines with improved thermal efficiency and reduced emissions. Laser Ignition (LI) has emerged as an efficient Ignition technique for delivering superior engine efficiency with lower emissions. Use of LI to initiate combustion in an engine fuelled with hydrogen–air mixtures can greatly help in reducing emissions, improving engine performance and tackling the problem of fossil fuel depletion. In this study, a laser ignited hydrogen fuel prototype engine has been developed and comparison of its performance, emissions and combustion parameters is done with baseline data generated using conventional spark Ignition (SI) system.
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comparative experimental evaluation of performance combustion and emissions of laser Ignition with conventional spark plug in a compressed natural gas fuelled single cylinder engine
Fuel, 2014Co-Authors: Dhananjay Kumar Srivastava, Avinash Kumar AgarwalAbstract:Laser is emerging as a strong concept for alternative Ignition in spark Ignition engine. Laser Ignition has potential advantages over conventional spark plug Ignition. Laser Ignition system is free from spark electrodes hence there is no loss of spark energy to the electrodes, which are also free from erosion effect. In addition, there is flexibility in choosing spark location and it offers excellent performance under high in-cylinder pressures. In this paper, performances of laser Ignition and conventional spark Ignition Systems are comparatively evaluated in terms of in-cylinder pressure variation, combustion stability, fuel consumption, power output and exhaust emissions at similar operating conditions of the engine.
Tom Troczynski - One of the best experts on this subject based on the ideXlab platform.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
Alan Welch - One of the best experts on this subject based on the ideXlab platform.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
F. A. Gizatullin - One of the best experts on this subject based on the ideXlab platform.
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Pulsed Plasma Ignition Systems with Synchronization of Discharge Processes
Russian Engineering Research, 2021Co-Authors: F. A. Gizatullin, R. M. SalikhovAbstract:Pulsed plasma Ignition Systems in gas-turbine engines with synchronization of primary and auxiliary discharge processes are considered. In terms of discharge duration, such Systems are intermediate between pulsed capacitive Systems and plasma Ignition Systems with a prolonged arc discharge. Experiments show that pulsed plasma Systems have better Ignition capabilities than capacitive Systems with oscillatory discharge, for the same capacitor charge.
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Assessing the Simulation of Capacitive Ignition Systems in Gas-Turbine Engines
Russian Engineering Research, 2020Co-Authors: F. A. Gizatullin, Z. G. Gabidullina, R. M. Salikhov, A. G. KarimovaAbstract:Fast pulsed processes in the semiconductor spark plugs of capacitive Ignition Systems for gas-turbine engines are analyzed. The results may be used to assess existing models of Ignition Systems. The most stable dependences of the discharge parameters in the spark plugs on the discharge-circuit parameters are presented. The discharge-circuit parameters considered are its inductance; the capacitance and charging voltage of the storage capacitor; the electrode gap; the cable length; the material of the inductance core; and the type of spark discharge.
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oscillatory discharge processes in capacitive Ignition Systems with a unipolar pulse
Russian Electrical Engineering, 2018Co-Authors: F. A. Gizatullin, R. M. Salikhov, Yu A BarabanovAbstract:The discharge processes in a capacitive Ignition system with a unipolar pulse, which offers advantages as compared with Ignition Systems of oscillatory discharge, are investigated. It is noted that the received wisdom concerning the dynamics of development of a unipolar discharge pulse is rather conditional. It is shown that, for small values of inductance of discharge circuit, the discharge in the plug becomes oscillatory, with a pronounced oscillating component being superimposed onto the aperiodic component of the current. An experimental setup and a technique for investigating the oscillatory discharges when changing the parameters of the discharge circuit including the storage-capacitor capacitance and the inductances in the circuit of a shooting semiconductor plug and in the circuit of a high-voltage diode are described. The results of oscilloscope experimental studies and an analysis of results of measuring of the energy of spark discharges in the shooting semiconductor plug are presented depending on the parameters of the discharge circuit. The regularities of development of oscillatory discharges are laid out. It is shown that oscillatory discharges are generated not only under small inductances of the discharge circuit, but also when increasing the inductance in the case of connecting an additional inductance, the value of which is lower than the value of the main inductance, to the high-voltage diode circuit. It is proved that the energy efficiency of the capacitive Ignition system of oscillatory discharge can exceed the efficiency of modern Ignition Systems with a unipolar pulse.
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Oscillatory–Discharge Processes in Capacitive Ignition Systems with a Unipolar Pulse
Russian Electrical Engineering, 2018Co-Authors: F. A. Gizatullin, R. M. Salikhov, A. Yu. BarabanovAbstract:The discharge processes in a capacitive Ignition system with a unipolar pulse, which offers advantages as compared with Ignition Systems of oscillatory discharge, are investigated. It is noted that the received wisdom concerning the dynamics of development of a unipolar discharge pulse is rather conditional. It is shown that, for small values of inductance of discharge circuit, the discharge in the plug becomes oscillatory, with a pronounced oscillating component being superimposed onto the aperiodic component of the current. An experimental setup and a technique for investigating the oscillatory discharges when changing the parameters of the discharge circuit including the storage-capacitor capacitance and the inductances in the circuit of a shooting semiconductor plug and in the circuit of a high-voltage diode are described. The results of oscilloscope experimental studies and an analysis of results of measuring of the energy of spark discharges in the shooting semiconductor plug are presented depending on the parameters of the discharge circuit. The regularities of development of oscillatory discharges are laid out. It is shown that oscillatory discharges are generated not only under small inductances of the discharge circuit, but also when increasing the inductance in the case of connecting an additional inductance, the value of which is lower than the value of the main inductance, to the high-voltage diode circuit. It is proved that the energy efficiency of the capacitive Ignition system of oscillatory discharge can exceed the efficiency of modern Ignition Systems with a unipolar pulse.
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Simulation of discharge impulses in GTE capacitance Ignition Systems
Russian Aeronautics (Iz VUZ), 2008Co-Authors: F. A. Gizatullin, K. V. Zinov’evAbstract:A possibility of enhancing the energy efficiency of the capacitance Ignition system by realizing the batch mode of discharge impulse generation is substantiated. Using the numerical simulation methods, a problem is solved to study the voltage-current characteristics of such discharge units as a spark discharger and a spark plug and peculiarities of discharge formation in them; the batch mode is simulated with proper account for the influence of discharge-recurrence rate upon dynamics of electric strength recovery in the discharge units. A possibility of optimizing the capacitance Ignition system parameters is theoretically evaluated to provide the maximum possible quantity of discharge impulse packet energy as well as the value of their peak capacity at the specified values of supply source power, discharge-recurrence rate, and total voltage of the entire Ignition system.
Carmen Oprea - One of the best experts on this subject based on the ideXlab platform.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 2 gas burner rig
International Journal of Applied Ceramic Technology, 2012Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Alan Welch, Frankie Wong, Tom TroczynskiAbstract:In the development of advanced natural gas and hydrogen direct injection combustion engines, a challenge is providing reliable hot-surface (glow plug, GP) Ignition Systems; most promising are GPs with silicon nitride-based heaters. This paper presents experimental results of accelerated degradation tests of the GPs on natural gas-burning rig, continuing previously published results on GP degradation in air. Degradation, ultimately leading to GP failure, occurs through the synergistic effects of electric field and chemical reactions in the combustion environment. The resulting microstructural modifications of the ceramic heater, studied by SEM/EDS, are a combination of sintering additive ions migration and surface oxidation.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
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degradation of silicon nitride glow plugs in various environments part 1 dc electric field in ambient air
International Journal of Applied Ceramic Technology, 2011Co-Authors: Carmen Oprea, Hamed Karimi Sharif, Colin Blair, Tom Troczynski, Frankie Wong, Alan WelchAbstract:All-ceramic glow plugs (GP) based on sintered-silicon nitride are evaluated as hot surface Ignition Systems for natural gas and hydrogen direct injection combustion engines. This paper presents experimental results of the accelerated degradation tests of the GPs in air, wherein GP is heated solely by dc electricity. The complex degradation process has been linked mostly to the redistribution of the sintering additives in Si3N4/Yb2O3 system under an influence of dc electric field and temperatures over 1300°C, as experienced by GP in-service. Ytterbium ions migration varies with time, temperature, and voltage. The microstructural damage was studied primarily by SEM microscopy.
