The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Sungwook Park - One of the best experts on this subject based on the ideXlab platform.
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combustion performance flame and soot characteristics of gasoline diesel pre blended fuel in an optical Compression Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
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Combustion performance, flame, and soot characteristics of gasoline–diesel pre-blended fuel in an optical Compression-Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Jongtae Lee, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
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Numerical and experimental study of combustion and emission characteristics in gasoline direct-injection Compression Ignition engines using intake preheating
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2012Co-Authors: Mingi Choi, Junepyo Cha, Seokjoo Kwon, Sungwook ParkAbstract:This paper presents a numerical and experimental study of the combustion and emission characteristics of a gasoline direct-injection Compression Ignition engine using intake preheating. The gasoline direct-injection Compression Ignition engine was predicted to reduce emissions compared with the emissions from a conventional diesel engine. To compare the combustion and emission characteristics of the gasoline direct-injection Compression Ignition and diesel engines, numerical modelling was conducted using the KIVA-3V release 2 code, which is integrated with the Chemkin chemistry solver II. Numerical simulations were performed under a variety of conditions to determine the optimal conditions for gasoline direct-injection Compression Ignition engine operation. In order to achieve the gas pressure in the cylinder and the emission characteristics, experiments were performed using a single-cylinder engine. The simulation results agreed well with the experimental data. The gasoline autoIgnition was in the parcel...
Choongsik Bae - One of the best experts on this subject based on the ideXlab platform.
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Load expansion of naphtha multiple premixed Compression Ignition (MPCI) and comparison with partially premixed Compression Ignition (PPCI) and conventional diesel combustion (CDC)
Fuel, 2014Co-Authors: Kihyun Kim, Zhi Wang, Shijin Shuai, Buyu Wang, Hongqiang Yang, Choongsik BaeAbstract:Abstract In previous studies, multiple premixed Compression Ignition (MPCI) has been proposed as a novel combustion concept in gasoline Compression Ignition engines which has great potential to achieve high thermal efficiency and low emissions simultaneously. MPCI mode was realized by a sequence of “spray–combustion–spray–combustion” around the Compression top dead center (TDC). This study is aimed for the high load expansion of naphtha MPCI. In addition, the study investigated advantages and disadvantages of MPCI compared with partially premixed Compression Ignition (PPCI) and conventional diesel combustion (CDC). Engine operating range successfully reached indicated mean effective pressure (IMEP) of 1.4 MPa with high thermal efficiency, low emissions and acceptable combustion noise by the optimization of the injection parameters and the intake management. For MPCI, earlier combustion phasing was possible even at the high load operation compared with PPCI and CDC. This was attributed to the separated heat release characteristics and pressure rise rate process. The divided pressure rise rate process caused considerably low maximum pressure rise rate (MPRR) characteristics such as 0.8 MPa/deg at IMEP 1.4 MPa condition. The earlier combustion phasing led to the higher thermal efficiency characteristics of MPCI combustion compared with PPCI and CDC. This was attributed to the lower exhaust heat loss characteristics. However, high level of hydrocarbon (HC) and carbon monoxide (CO) emissions with low combustion stability at the low load operation were considered as severe challenges to overcome.
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Premixed Compression Ignition combustion with various injector configurations in a heavy duty diesel engine
Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2012Co-Authors: Yongjin Jung, Choongsik Bae, Seibum B. Choi, Hyun Dong ShinAbstract:Premixed Compression Ignition combustion was implemented using early injection timing and exhaust gas recirculation in a direct injection single cylinder diesel engine and was evaluated with respect to the injector configurations. A baseline injector with an injection angle of 146° and eight nozzle holes showed premixed Compression Ignition combustion at the injection timing of 40° crank angle before top dead centre among three distinct combustion regimes. The burn duration in premixed Compression Ignition combustion was shortest among the regimes. Premixed Compression Ignition combustion at an injection timing of 40° crank angle before top dead centre was achieved at an exhaust gas recirculation rate ranging from 0% to approximately 40%. Two different injector configurations were applied to investigate the effect of injection angle and the number of nozzle holes on premixed Compression Ignition combustion: one had an injection angle of 70° and eight nozzle holes and the other had an injection angle of 70...
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Diffusion- and Homogeneous-Charge Combustion of Volatile Ethers in a Compression Ignition Engine
Energy & Fuels, 2009Co-Authors: Alessandro Schönborn, Nicos Ladommatos, Choongsik BaeAbstract:The combustion characteristics of several volatile ether molecules were studied under diffusion and homogeneous charge combustion modes in a Compression Ignition engine. Volatile ethers of low molecular mass are organic molecules that could be used as fuel for Compression Ignition engines. The physical and chemical characteristics of such ethers comprise high oxygen content, high volatility, and low viscosity, all of which are conducive to high thermal efficiencies and low pollutant emission during engine operation. It is thought that sootless combustion may be achieved in diffusion flames of high-speed direct injection diesel engines with some volatile ethers, due to their high oxygen content. The formation of oxides of nitrogen from the combustion of ethers may be almost eliminated by the use of lean, homogeneous charge Compression Ignition combustion, for which these fuel molecules are particularly suitable due to their high volatility. The first part of the experiments examines the combustion characte...
Joonho Jeon - One of the best experts on this subject based on the ideXlab platform.
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combustion performance flame and soot characteristics of gasoline diesel pre blended fuel in an optical Compression Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
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Combustion performance, flame, and soot characteristics of gasoline–diesel pre-blended fuel in an optical Compression-Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Jongtae Lee, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
Sang Il Kwon - One of the best experts on this subject based on the ideXlab platform.
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combustion performance flame and soot characteristics of gasoline diesel pre blended fuel in an optical Compression Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
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Combustion performance, flame, and soot characteristics of gasoline–diesel pre-blended fuel in an optical Compression-Ignition engine
Energy Conversion and Management, 2016Co-Authors: Joonho Jeon, Sang Il Kwon, Jongtae Lee, Sungwook ParkAbstract:Abstract Among the new combustion technologies available for internal combustion engines to enhance performance and reduce exhausted emissions, the homogeneous charge Compression Ignition method is one of the most effective strategies for the Compression-Ignition engine. There are some challenges to realize the homogeneous charge Compression Ignition method in the Compression-Ignition engine. The use of gasoline–diesel blended fuel has been suggested as an alternative strategy to take advantages of homogeneous charge Compression Ignition while overcoming its challenges. Gasoline and diesel fuels are reference fuels for the spark-Ignition and Compression-Ignition engines, respectively, both of which are widely used. The application of both these fuels together in the Compression-Ignition engine has been investigated using a hybrid injection system combining port fuel injection (gasoline) and direct injection (diesel); this strategy is termed reactivity controlled Compression Ignition. However, the pre-blending of gasoline and diesel fuels for direct injection systems has been rarely studied. For the case of direct injection of pre-blended fuel into the cylinder, various aspects of blended fuels should be investigated, including their spray breakup, fuel/air mixing, combustion development, and emissions. In the present study, the use of gasoline–diesel pre-blended fuel in an optical single-cylinder Compression-Ignition engine was investigated under various conditions of injection timing and pressure. Furthermore, KIVA-3V release 2 code was employed to model the formation of fuel/air mixtures in the cylinder. Neat diesel fuel was tested, as well as gasoline–diesel blends of 20% and 40% gasoline mass fraction. Experiments on the mixed fuels showed that the inclusion of gasoline fuel improved fuel/air mixing, yielding more homogeneous mixtures over wider cylinder areas. The low cetane index of gasoline fuel induced long Ignition delays in the mixed fuels. Compared with neat diesel combustion flame, blended fuel did not produce the soot flame, white-yellow flame. Soot intensity was calculated based on captured flame images, and its variations were investigated as a function of fuel type and injection conditions.
Dennis N Assanis - One of the best experts on this subject based on the ideXlab platform.
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the attainment of premixed Compression Ignition low temperature combustion in a Compression Ignition direct injection engine
Proceedings of the Combustion Institute, 2007Co-Authors: Timothy J Jacobs, Dennis N AssanisAbstract:Abstract This study theoretically proposes and experimentally demonstrates the simultaneous reductions of exhaust nitric oxide (NO) and soot via the attainment of premixed Compression Ignition (PCI) combustion in a modern Compression Ignition direct injection (CIDI) engine. The key features leading to PCI combustion are a well-mixed fuel–air mixture, following a long Ignition delay period, which burns at relatively low temperature. It is shown that simultaneous reductions in exhaust NO and soot concentrations are possible with the implementation of PCI combustion. At very low combustion temperatures, soot formation mechanisms decrease substantially so that both NO and soot formation have very little dependence on local equivalence ratios. As a result, it becomes possible to increase the global equivalence ratio above stoichiometric, and produce rich products of combustion for regeneration of certain diesel aftertreatment systems.
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lean and rich premixed Compression Ignition combustion in a light duty diesel engine
SAE transactions, 2005Co-Authors: Timothy J Jacobs, Dennis N Assanis, Stanislav V Bohac, Patrick G SzymkowiczAbstract:ABSTRACT Lean premixed Compression Ignition low-temperature combustion promises to simultaneously reduce NO x and PM emissions while suffering a moderate penalty in fuel consumption. Similarly, opportunities exist to develop rich combustion strategies which can provide the necessary exhaust constituents for aggressive regeneration of a lean NO x trap (LNT). The current work highlights the development of lean and rich premixed Compression Ignition combustion strategies. It is shown that the lean premixed Compression Ignition combustion strategy successfully operates with low NO x and smoke, at the expense of a 5% increase in fuel consumption over conventional diesel operation. The rich premixed Compression Ignition combustion strategy similarly operates with low NO x and smoke, and produces enough CO (up to 5% by volume in exhaust) for aggressive regeneration of an LNT. INTRODUCTION In his lecture given to the Society of Cassell on June 16, 1897, Rudolph Diesel stipulated as a third condition of his rational heat motor that fuel must be introduced gradually so as to maintain an isothermal combustion process [1]. Hence, from the early days of diesel engine development, it appeared that diffusion burn combustion would dominate. Nevertheless, this developmental road progressively changed direction as awareness of vehicle emissions and their impact on the atmosphere surfaced [2]. As researchers learned more about diesel engine combustion, it became increasingly clear that the diffusion burn portion was largely responsible for its soot emission [3]. Therefore, the desire to overturn Diesel’s condition of isothermal combustion developed, and attention shifted to premixed combustion modes [4]. Today, the development of combustion strategies resembling homogenous charge Compression Ignition strategies is vigorously pursued. The promise of simultaneously reduced NO