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김정일(Jungill Kim),임태균(Taegyun Lim),조장형(Janghyung Cho) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper deals with engine room and underbody layout of fuel cell electric vehicle(FCEV), which has been proposed as a potential alternative to fossil fuel depletion. Investing the great R&D efforts, the global vehicle manufactures, especially Honda motor corporate in Japan, has shown not prototype but commercial vehicle using fuel cell in U.S and Japan market recently. In this paper, we analyze cooling and aerodynamic performance with engine room and underbody layout in newly FCEV. The two radiators for fuel cell and electric compartment parts cooling in FCEV has been analyzed, their performance are obtained in terms of cooling performance ratio(CPR). The aerodynamic performance is closely related to fuel consumption, and stack load condition is changed with aerodynamic performance in FCEV, therefore it is very important parameter for FCEV design. But, Aerodynamic performance for FCEV is not progress yet. Engine room layout is not effected cooling performance, which is the cooling module already is operated maximum power, but aerodynamic performance is higher than internal combustion engine vehicle about 10%. Improvement of aerodynamic performance increased efficiency and reduced heat rejection in fuel cell stack, vehicle performance is increased dramatically. Aerodynamic performance is evaluated in terms of drag coefficient, improved through underbody modification using air devices.
서호철(Hocheol Suh),박세종(Sejong Park),박경석(Kyoungsuk Park),전완호(Wanho Jeon),조장형(Janghyung Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, there are some problem of flow noise in a muffler of the exhaust system. This noise is generated from the flow fluctuation inside the muffler. In this paper, we want to establish a analysis process of this flow noise. The flow field was calculated by a commercial CFD code - SC/Tetra. Flow noise was calculated by Ffowcs-Williams and Hawking's equation. From the results, we can find dominant noise source and noise generation mechanisms.
대류 효율을 극대화한 PAR 냉각홀 방열 구조의 특성 연구
박준철(JunChurl Park),전완호(WanHo Jeon),신형식(HyungSik Shin),권순환(SoonHwan Kwon),조장형(JangHyung Cho) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.11
LED(발광 다이오드) 조명은 낮은 소비 전력에 대한 대체 조명 장치로 주목받고 있다. 그러나 열관리에 대한 중요한 문제가 있으며 빛의 강도의 저하 및 LED 조명의 수명 단축에 문제가 있음이 알려져 있다. 본 논문에서는 열 문제의 해결을 위해 측면 Hole을 제안 한다. 이 측면 Hole은 충분히 자연 대류를 유도하고 온도를 낮춘 것으로 LED 조명 시스템의 측면 모두에서 방열을 한다. 이런 메인 Hole 효과를 증명하기 위해 CFD(computational fluid dynamics) 방법은 LED 온도를 예측할 수 있으며 LED 조명 시스템을 최적화하기 위해 사용된다. LED(Light-Emitting Diode) lighting is noticed as substitute lighting device for low consumption electric power. But there is a hot issues of heat management. Known issues are degradation of light intensity and shortened life time of LED light. In this paper, the side hole is proposed for the solution of thermal problem. This side hole induces enough natural convection and makes heat dissipation on the both side of LED light system to be lowered temperature. To prove the main hole effect, CFD(computational fluid dynamics) method was used to predict LED temperature and optimize LED light system.
CFD 기법을 통한 지게차 엔진 룸 내 유동 특성 평가
양지혜(Jihae Yang),김낙인(Nag-In Kim),김정일(Jungill Kim),조장형(Janghyung Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In this paper, the procedure and methodology of the engine room cooling performance analysis for a forklift truck are presented using a CFD(Computation Fluid Dynamics) technique. The mesh generation of the CFD modeling of the engine room was a time consumed and difficult work for a CFD engineer to obtain the reasonable analysis results. Special exclusive codes were investigated to reduce the simulation time and obtain accurate results for the engine room heat analysis. In addition, the well-defined boundary condition in the CFD model and the accurate experimental data of a fan and radiator were also important factors to obtain a good simulation result closed to measure value. To verify the proposed procedure and methodology, the radiator inlet coolant temperature was compared with the simulation and experiment results. It shows that the proposed simulation method and modeling techniques are effective one for the cooler system design of a forklift engine room.
김재우(Jaewoo Kim),김광민(Kwangmin Kim),문영기(Younggi Mun),이경은(Kyungeun Lee),김정일(Jungill Kim),전완호(Wanho Jeon),조장형(Janghyung Cho) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
In this study, AVWT (Automatic Virtual Wind Tunnel) is developed to estimate of vehicle aerodynamic performance. For the first step of using AVWT, engineer set boundary condition and mesh condition on the main window. As engineer executes AVWT, aerodynamic analysis of vehicle is performed from pre process (mesh generation) to post process automatically. In order to secure the accuracy of AVWT, drag coefficient values of using AVWT are compared with those of experiment for the three typical DrivAer models (Notchback, Fastback, and Hatchback). As a result, the error of the difference between the result AVWT and experiment is less than 5%