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Theoretical Analysis of a Spark Ignition Engine by the Thermodynamic Engine Model
한성빈 한국에너지학회 2015 에너지공학 Vol.24 No.3
Recent engine development has focused mainly on the improvement of engine efficiency and output emissions. The improvements in efficiency are being made by friction reduction, combustion improvement and thermodynamic cycle modification. Computer simulation has been developed to predict the performance of a spark ignition engine. The effects of various cylinder pressure, heat release, flame temperature, unburned gas temperature, flame properties, laminar burning velocity, turbulence burning velocity, etc. were simulated. The simulation and analysis show several meaningful results. The objective of the present study is to develop a combustion model for a spark ignition engine running with isooctane as a fuel and predicting its behavior.
Combustion Characteristics of Hydrogen by the Thermodynamic Properties Analysis
한성빈 한국에너지학회 2015 에너지공학 Vol.24 No.2
Hydrogen has some remarkably high values of the key properties for transport processes, such as kinematic viscosity, thermal conductivity and diffusion coefficient. Hydrogen, as an energy medium, has some distinct benefits for its high efficiency and convenience in storage, transportation and conversion. Hydrogen has much wider limits of flammability in air than methane, propane or gasoline and the minimum ignition energy is about an order of magnitude lower than for other combustibles. Statistical thermodynamics provides the relationships that we need in order to bridge this gap between the macro and the micro. Our most important application will involve the calculation of the thermodynamic properties of the ideal gas.
An Experemental Study on Performance Characteristics of a Hydrogen Fuelled Spark Ignition Engine
한성빈 한국에너지학회 2014 에너지공학 Vol.23 No.1
The purpose of this study is to obtain low-emission and high-efficiency in LPG engine with hydrogen enrichment. The objective of this paper is to clarify the effects of hydrogen enrichment in LPG fuelled engine on exhaust emission, thermal efficiency and performance. The compression ratio of 8 was selected to avoid abnormal combustion. To maintain equal heating value of fuel blend, the amount of LPG was decreased as hydrogen was gradually added. The relative air-fuel ratio was increased from 0.76 to 1.5, and the ignition timing was controlled to be at minimum spark advance for best torque (MBT).
A STUDY ON THE ENGINE PERFORMANCE OF A SPARK IGNITION ENGINE ACCORDING TO THE IGNITION ENERGY
한성빈 한국에너지학회 2014 에너지공학 Vol.23 No.3
The more or less homogeneous fuel-air mixture that exists at the end of the compression process is ignitedby an electric ignition spark from a spark plug shortly before top dead center. The actual moment of ignitionis an optimization parameter; it is adapted to the engine operation so that an optimum combustion process isobtained. Brake mean effective pressure (BMEP) of the spark ignition energy control device (IECD) thanconventional spark system at the stoichiometric mixture is increased about 9%. For lean burn engine, the leanlimit is extended about 25% by using the IECD. It was considered the stability of combustion by the increaseof flame kernel according to the high ignition energy supplies in initial period and discharge energy periodlengthen by using the IECD.
A Study on the Prediction of Hydrogen Vehicle by the Thermodynamic Properties
한성빈 한국에너지학회 2015 에너지공학 Vol.24 No.2
Hydrogen has long been recognized as a fuel having some unique and highly desirable properties, for application as a fuel in engines. Hydrogen has some remarkably high values of the key properties for transport processes, such as kinematic viscosity, thermal conductivity and diffusion coefficient, in comparison to those of the other fuels. Such differences together with its extremely low density and low luminosity help to give hydrogen its unique diffusive and heat transfer characteristics. The thermodynamic and heat transfer characteristics of hydrogen tend to produce high compression temperatures that contribute to improvements in engine efficiency and lean mixture operation.
한성빈 한국에너지학회 2015 에너지공학 Vol.24 No.3
Homogeneous charge compression ignition (HCCI) engine combines the combustion characteristics of a compression ignition engine and a spark ignition engine. HCCI engines take advantage of the high compression ratio and heat release rate and thus exhibit high efficiency found in compression ignition engines. In modern research, simulation has be come a powerful tool as it saves time and also economical when compared to experimental study. Engine simulation has been developed to predict the performance of a homogeneous charge compression ignition engine. The effects of compression ratio, cylinder pressure, rate of pressure rise, flame temperature, rate of heat release, and mass fraction burned were simulated. The simulation and analysis show several meaningful results. The objective of the present study is to develop a combustion characteristics model for a homogeneous charge compression ignition engine running with isooctane as a fuel and effect of compression ratio.
스파크 점화기관의 열유속 및 열전달 계수에 대한 실험적 연구
한성빈,권영직,이성렬,Han, Seong-Bin,Gwon, Yeong-Jik,Lee, Jeong-Yeol 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.11
In order to design and develop a spark ignition engine, many studies must be preceded about the characteristics of thermal flow. For measurement of transient wall temperature thin film thermocouples of Bendersky type were manufactured and these probes were fixed into the wall of combustion chamber. Surface wall temperatures were measured in experiments of various engine speeds. Transient heat fluxes were calculated from the wall temperature measurements. Pressure was measured from combustion chamber using pressure transducer and gas temperatures were calculated using the state equation of ideal gas. And instantaneous heat transfer coefficients were obtained. It will be the basic data for the formulae of instantaneous heat transfer coefficients.
한성빈,장용훈,Han, Sung-Bin,Chang, Yong-Hoon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.5
Cyclic variability has long been recognized as limiting the range of operating conditions of spark ignition engines, in particular, under lean and highly diluted operation conditions. The cyclic combustion variations can be characterized by the pressure parameters, combustion parameters, and flame front parameters. The coefficient of variation in indicated mean effective pressure ($COV_{IMEP}$) defines the cyclic variability in indicated work per cycle, and it has been found that vehicle driveability problems usually result when $COV_{IMEP}$ exceeds about 10%. For analysis of the cyclic variability in SI engines at idling, the results show that cyclic variability by the $COV_{IMEP}$ or the coefficient of variation in maximum pressure can be explained and may be consequently reduced by the help of the optimum spark timings.