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합성가스 배기분사에 의한 배기다기관내의 유동 및 연소특성에 관한 해석적 연구
전필규(Phil Gyu Jeon),이준호(Joon Ho Lee),박영준(Young-Joon Park),김득상(Duk-Sang Kim),조용석(Yong-Seok Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to satisfy the ULEV emission regulation, a fast rise up to light off temperature of catalyst is essential for reducing HC and CO emission during idle operation in an SI engine. Exhaust Synthetic Gas Injection(ESGI) method developed in this study will expect that exhaust gas temperature rapidly rises up to light off temperature of catalyst during this period. Therefore, it is important that we analyze characteristics of flow and combustion by mixing exhaust gas and synthetic gas in the exhaust manifold. In this study, characteristics of flow and H₂/O₂ fraction by changing synthetic gas injection rate in the exhaust manifold are calculated by CFD. We confirmed the point which the combustion is possible through this results. After installing glow plug in these positions, a characteristic of combustion is analyzed. Hereafter, this study will be based experiment of synthetic gas combustion in the exhaust manifold.
전필규(Phil-gyu Jeon),김득상(Duk-Sang Kim),안석종(Seok-jong An),양승일(Seung-Il Yang),허민(Min Heo),조용석(Yong-Seok Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In new generation vehicle technologies, vehicles powered by electricity become much more important, by virtue of their emission merits. In addition, fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on modeling of an electric vehicle to estimate performances and design of an EV cart to verify the modeling. The EV cart is composed of DC motor. battery and PWM controller and their specitications are measured and applied to simulation. The numerical model is able to estimate vehicle speed, voltage, current, and sac from fundamental equations. Data from modeling and EV cart are compared in maximum speed mode and driving cycle mode. The profiles of voltage, current which is supplied to motor, and vehicle speed from the model show good agreement with vehicle tests but transition effects.
정적연소기를 이용한 합성가스의 연소특성에 관한 실험적 연구
안재원(Jae-Won An),전필규(Phil-Gyu Jeon),박영준(Young-Joon Park),김득상(Duk-Sang Kim),조용석(Yong-Seok Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hydrogen comes into the spotlight as the alternative energy. On board generation of hydrogen is being explored via catalytic or plasma-based reformers. Synthetic gas reformed from hydrocarbon-based fuel mainly consists of hydrogen, carbon monoxide, and nitrogen. In order to use synthetic gas as combustion, clarifying combustion characteristic of synthetic gas is important. From previous study, flammability limit of synthetic gas was confirmed. This paper details experiments relating to combustion characteristics of synthetic gas. Composition of the mixture in a constant volume chamber was controlled with partial pressure of each gas in various ambient pressures. This study investigates effects of H₂/O₂ ratio and sum of H₂ and O₂ volume fractions on combustion from combustion pressure and rates of heat release of synthetic gas. Also, flame speed was calculated by visualizing combustion of synthetic gas.
연료 전지의 성능 모델링 및 연료 전지 자동차의 성능 예측
양승일(Seung Il Yang),김득상(Phil Gyu Jeon),전필규(Duk-Sang Kim),조용석(Yong-Seok Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In developing new generation vehicles, vehicles powered on electricity become much more important, by virtue of their emission merits. In addition, fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on fuel cell modeling to estimate characteristics of power and fuel hydrogen consumption of a fuel cell stack. From the model, simulations to evaluate performance of a fuel cell vehicle are applied. From analytically derived equations showing relationships of stack voltage and current, provided power of the fuel cell stack is estimated. The estimations are also compared with the data of the Ballard Nexa fuel cell stack. In order to investigate a fuel cell based vehicle, motor and fuel cell models are integrated in a vehicle model. The characteristics of individual components are also integrated. The individual components include drivetrain, vehicle properties such as drag, frontal area, wheel inertia, and the fuel cell stack. Calculated fuel cell equations show good agreements with test results. Furthermore the stack model shows its propriety in aspect of power characteristics, polarization, and fuel consumption. In the vehicle simulation, maximum speed and hydrogen fuel consumption are estimated. Even though there is no experimental data from vehicle tests, the vehicle simulation showed physically-acceptable vehicle characteristics.