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수치해석을 통한 PEMFC 채널의 설계와 SU-8을 이용한 채널 제작 및 성능 평가
최인재(Injea Choi),왕학민(Hakmin Wang),최갑승(Kap-Seung Choi),김형만(Hyung-Man Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.4
연료전지는 환경문제와 천연자원 고갈을 해결할 수 있기 때문에 가장 주목받고 있는 새로운 동력원이다. 본 논문에서는 마이크로 연료전지의 효율을 높이기 위해 다양한 형상에 대해 마이크로 채널에서 수소가스 유동을 수치해석 하였다. 이미 개발된 채널과 새롭게 고안된 채널, 모두 여섯 개의 다른 형상을 가진 채널이 같은 유동 특성과 경계조건으로 수치해석을 수행하였다. 수치해석 결과를 통해 유속, 유동분포 유동균일성 등이 채널형상에 따라 영향을 많이 받는 것을 알았다. 이에 수소 가스 유동을 고려한 채널형상 최적화를 통해 연료전지의 성능을 향상시키고자 하였다. 수치해석을 통한 최적화된 채널형상을 사용한 실험결과 평균보다 높은 전류밀도를 나타내었다. 그러나 내구성이 낮았다. Fuel cells have attracted enormous interest as new power sources because the cells can be used to solve the problem of environmental pollution as well as the natural-resource exhaustion problem. In this study, hydrogen-gas flow in microchannels of different shapes was numerically analyzed to improve the efficiency of a microfuel cell. Flow characteristics in six microchannels of different shapes but under identical boundary conditions were simulated. The analysis result shows that the flow characteristics such as velocity, uniformity, and flow rate, greatly depend upon the channel shape. This implies that the efficiency of microfuel cell can be expected to be increased by adopting the optimal configuration of channel shape for hydrogen-gas flow. The experimental results show that power density of a PEMFC with a microflow channel is higher than that of a PEMFC without a microflow channel; however, a durable catalyst is required in MEA.
상이한 전열면적을 가진 디젤엔진 EGR Cooler의 실험적 연구
최인재(Injea Choi),박상기(Sang-Ki Park),김민철(Min-Chol Kim),최갑승(Kap-Seung Choi),김형만(Hyung-Man Kim) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
Today, electronically controlled injection system are used in diesel engines, in which oxidation catalysis contribute to the reduction of hydrocarbons and particle emission. Exhaust gas recirculation is the only practical solution available for reducing PM(particle matter) and NOx in diesel engines aside form measures in the engine such as staggered injection. By significantly lowering the temperature of the recirculated exhaust gases, EGR cooling contributes to the effects of exhaust gas recirculation and leads to further reduction of nitrogen oxides. EGR systems have long been acknowledged as effective tools for reducing nitrogen oxides in diesel engines. In this paper, engine dynamometer experiments have been carried on the characteristics which improve heat exchange efficiency of EGR cooler with the mea change. The heat exchange efficiency has been experimentally performed with four, five and six-type of EGR coolers, and compared the performance characteristics of the three EGR coolers.
섬유 복합재 소재의 두께에 따른 강성 해석 정합성 향상 연구
이인제(InJea Lee),박래성(RaeSung Park),장미옥(MiOk Jang),이교민(GyoMin Lee),강인성(InSung Kang),엄정민(JungMin Eom) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Automotive parts that require rigidity, such as door-modules, FEM carriers and bumpers has been applied with conventional metal materials, but they have been replaced with fiber-reinforced composites to reduce weight. Currently, automotive parts are being developed and applied with low weight parts through thickness thinnering as a weight light trend to improve fuel economy. However, as the thickness decreases, the stiffness decreased, so an analysis technique of materials is required to supplement the stiffness. In this study, the actual deformation that occurs when a load is applied to a specimen injection-molded of PP-GF20 material is measured, and the simulation results are compared with the consistency. In order to increase this consistency, it was possible to increase the consistency from about 60% to more than 80% by adjusting the elasticity of the material input in the structural analysis, and it was found that the elasticity of the material should be applied differently to analysis depending on the thickness of the molded product.
이인제(InJea Lee),김민수(MinSu Park),박래성(RaeSung Park),김영범(YoungBum Kim),강인성(In-Sung Kang),엄정민(JungMin Eom) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
The door Module is a structural steel part that is mounted inside a car door and assembled with a window guide rail, door latch and speaker. Steel have been used in the past, but they are being replaced by glass fiber reinforced plastics(GFRP). Due to the demand for lightweight, low density materials gave been developed through thinning thickness of panels and reducing of glass fibers. However, if the thickness is thinner and the fiber content is reduced, the stiffness of the panel is lowered. Therefore, the design and simulation technique for compensating the rigidity of the panel is required. In this study, the actual deformation amount of a door module panel injection molded with PP-GF20 material was measured and the simulation results and the accuracy were compared. By adjusting the flexural modulus of the PP-GF20 material, the accuracy could be increased from about 50% to 85%. It was found that the flexural modulus of the material should be measured in accordance with the molding design characteristics of the actual door panel.