The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Electo Eduardo Silva Lora - One of the best experts on this subject based on the ideXlab platform.
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Development of a homogeneous charge pre-chamber torch Ignition System for an SI engine fuelled with hydrous ethanol
Applied Thermal Engineering, 2019Co-Authors: Roberto Berlini Rodrigues Da Costa, Alysson Fernandes Teixeira, Fernando Antonio Rodrigues Filho, Fabrício José Pacheco Pujatti, Christian J.r. Coronado, Juan J. Hernández, Electo Eduardo Silva LoraAbstract:Abstract Energy is the key to wellbeing and sustainability of modern civilization and its demand continues to increase. With the end of oil availability perspectives and the world energy crisis, technological solutions are needed from the scientific community to promote the reduction of fossil fuel consumption, the maximization of fuel conversion efficiency and the reduction of emission levels in internal combustion engines. Aiming at reaching these needs, the use of a pre-chamber Ignition System in spark-Ignition (SI) engines is a potential alternative enabling such engines to operate with lean mixtures and with a wide variety of fuels. In this study, a methodology was developed to design and characterize experimentally a homogeneous charge pre-chamber torch Ignition System fuelled with hydrous ethanol (with 6–7% in mass of water content) and using lean burn mixtures (excess air ratio (λ) > 1.0). The methodology, which has not been reported previously in other works, consisted of a one-dimensional mathematical model, that allowed for the definition of pre-chamber geometrical parameters. The device was manufactured and adapted to an SI engine, requiring no additional work to the cylinder head, as the pre-chamber was mounted in the original spark-plug screw thread. The prototype was experimentally characterized on an active dynamometer, and performance, combustion, emission and combustion visualization were studied. The pre-chamber Ignition engine expanded the flammability limit in comparison with the baseline engine. For λ = 1.4, engine fuel conversion efficiency was increased by 5.4%, specific fuel consumption decreased by 22% and nitrogen oxides (NOx) emissions reduced by 52%, but total hydrocarbons (THC) emissions increased. Improvements achieved were due to the faster burn rates characterized by the reduced MBF 0–10%, combustion duration and combustion instability, and also the increased thermodynamic efficiency and the lower combustion temperatures achieved with lean burn technology. From the conclusions obtained in this research, the homogeneous pre-chamber torch Ignition System developed for hydrous ethanol has potential for application and marketability integration, as an alternative technology able to help meet energy demands in a sustainable manner.
Fabrice Foucher - One of the best experts on this subject based on the ideXlab platform.
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radio frequency spark plug an Ignition System for modern internal combustion engines
Applied Energy, 2014Co-Authors: Antonio Mariani, Fabrice FoucherAbstract:Abstract Plasma sustained Ignition Systems are promising alternatives to conventional spark plugs for those applications where the conditions inside the combustion chamber are more severe for spark plug operation, like internal combustion engines with high compression ratio values or intake charge dilution. This paper shows the results of an experimental activity performed on a spark Ignition internal combustion engine equipped with a Radio Frequency sustained Plasma Ignition System (RFSI). Results showed that the RFSI improved engine efficiency, extended the lean limit of combustion and reduced the cycle-by-cycle variability, compared with the conventional spark plug for all test conditions. The adoption of the RFSI also had a positive impact on carbon monoxide and unburned hydrocarbon emissions, whereas nitrogen oxide emissions increased due to higher temperatures in the combustion chamber. Therefore, RFSI represents an innovative Ignition device for modern internal combustion engines and overcomes the compatibility problems of other non-conventional Ignition Systems.
Roberto Berlini Rodrigues Da Costa - One of the best experts on this subject based on the ideXlab platform.
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Development of a homogeneous charge pre-chamber torch Ignition System for an SI engine fuelled with hydrous ethanol
Applied Thermal Engineering, 2019Co-Authors: Roberto Berlini Rodrigues Da Costa, Alysson Fernandes Teixeira, Fernando Antonio Rodrigues Filho, Fabrício José Pacheco Pujatti, Christian J.r. Coronado, Juan J. Hernández, Electo Eduardo Silva LoraAbstract:Abstract Energy is the key to wellbeing and sustainability of modern civilization and its demand continues to increase. With the end of oil availability perspectives and the world energy crisis, technological solutions are needed from the scientific community to promote the reduction of fossil fuel consumption, the maximization of fuel conversion efficiency and the reduction of emission levels in internal combustion engines. Aiming at reaching these needs, the use of a pre-chamber Ignition System in spark-Ignition (SI) engines is a potential alternative enabling such engines to operate with lean mixtures and with a wide variety of fuels. In this study, a methodology was developed to design and characterize experimentally a homogeneous charge pre-chamber torch Ignition System fuelled with hydrous ethanol (with 6–7% in mass of water content) and using lean burn mixtures (excess air ratio (λ) > 1.0). The methodology, which has not been reported previously in other works, consisted of a one-dimensional mathematical model, that allowed for the definition of pre-chamber geometrical parameters. The device was manufactured and adapted to an SI engine, requiring no additional work to the cylinder head, as the pre-chamber was mounted in the original spark-plug screw thread. The prototype was experimentally characterized on an active dynamometer, and performance, combustion, emission and combustion visualization were studied. The pre-chamber Ignition engine expanded the flammability limit in comparison with the baseline engine. For λ = 1.4, engine fuel conversion efficiency was increased by 5.4%, specific fuel consumption decreased by 22% and nitrogen oxides (NOx) emissions reduced by 52%, but total hydrocarbons (THC) emissions increased. Improvements achieved were due to the faster burn rates characterized by the reduced MBF 0–10%, combustion duration and combustion instability, and also the increased thermodynamic efficiency and the lower combustion temperatures achieved with lean burn technology. From the conclusions obtained in this research, the homogeneous pre-chamber torch Ignition System developed for hydrous ethanol has potential for application and marketability integration, as an alternative technology able to help meet energy demands in a sustainable manner.
Antonio Mariani - One of the best experts on this subject based on the ideXlab platform.
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radio frequency spark plug an Ignition System for modern internal combustion engines
Applied Energy, 2014Co-Authors: Antonio Mariani, Fabrice FoucherAbstract:Abstract Plasma sustained Ignition Systems are promising alternatives to conventional spark plugs for those applications where the conditions inside the combustion chamber are more severe for spark plug operation, like internal combustion engines with high compression ratio values or intake charge dilution. This paper shows the results of an experimental activity performed on a spark Ignition internal combustion engine equipped with a Radio Frequency sustained Plasma Ignition System (RFSI). Results showed that the RFSI improved engine efficiency, extended the lean limit of combustion and reduced the cycle-by-cycle variability, compared with the conventional spark plug for all test conditions. The adoption of the RFSI also had a positive impact on carbon monoxide and unburned hydrocarbon emissions, whereas nitrogen oxide emissions increased due to higher temperatures in the combustion chamber. Therefore, RFSI represents an innovative Ignition device for modern internal combustion engines and overcomes the compatibility problems of other non-conventional Ignition Systems.
Norimasa Iida - One of the best experts on this subject based on the ideXlab platform.
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an investigation of multiple spark discharge using multi coil Ignition System for improving thermal efficiency of lean si engine operation
Applied Energy, 2018Co-Authors: Dongwon Jung, Norimasa IidaAbstract:Abstract Lean spark Ignition (SI) engine operation can provide improvement of the thermal efficiency relative to that of stoichiometric SI operation. However, the cycle-to-cycle variations of SI combustion increase with increasing air dilution, and become unacceptable. To gain the benefits of lean operation, the ability to ensure stable, complete and fast combustion is required. As a method to enable stable lean operation, this study investigates the effects of multiple spark discharge on lean SI operation using a multi-coil Ignition System that features ten spark coils for a single spark plug. First, the effects of multiple spark discharge on the combustion phasing and the combustion duration are examined for lean operation (excess-air ratio (λ) = 1.67) under a constant spark timing. The results show that both the total discharge duration and the total discharge energy increase with the extension of time interval between spark discharges (Δti) for multiple spark discharge. For the multiple spark discharge of substantially extended Δti, a number of restrikes occur after the spark blowouts due to the weak discharge energy release rate. However, both the total discharge duration and the total discharge energy do not contribute directly to the change of initial combustion phase. Instead, the effective spark discharge energy exists within the total discharge energy, which actually contributes to the change of initial combustion phase. When the effective spark discharge energy is high, it leads to the advancement of the initial combustion phase, resulting in the number of knocking cycles increases with the increase of knocking intensity. Second, additional experiments were conducted under ultra-lean conditions in the λ = 1.82–1.97 range since the effects of multiple spark discharge on SI combustion are much more pronounced for the leaner operation. The results show that the net indicated thermal efficiency increases quite linearly with increasing λ for all multiple spark discharges considered. Especially, for the multiple spark discharge of Δti = 0.2 ms, a proper spark discharge energy is generated from the spark timing to a certain timing after the first start of spark discharge, which advances both the spark timing and the initial combustion phase. A combination of the advanced spark timing and the advanced initial combustion phase leads to the advancement of main combustion phase, and eventually shorten the combustion duration. Because of shortened combustion duration, stable ultra-lean operation at around λ = 1.94 can be achieved with the highest net indicated thermal efficiency of 47.0%.
