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조장형(JH CHO),원영수(YS WON),조규수(KS CHO) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
A 3-dimensional flow analysis in a muffler considering pulsating pressure of exhaust gas has been conducted to provide a pressure data for noise reduction. The CFD analysis of a unit area of porous materials also conducted for determining the permeability of perforated inlet pipe and baffle plates. The pulsating velocity of exhaust gas was assumed for three case conditions. The STAR-CD S/W used for the three dimensional unsteady state CFD analysis in a muffler. The pulsating pressure amplitude was decreased in an outlet pipe of muffler. About 80% pressure drop was obtained between inlet pipe and out pipe. For a practical application, temperature calculation in a muffler has to conducts.<br/>
조장형(J.H.CHO),강성종(S.J.Kang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
A numerical analysis study for three dimentional under hood air flow was carried out in order to predict distribution of air flow, air temperature on engine compartment parts and air flow rate through radiator that has influence on engine cooling.<br/> The change of air flow rate through radiator with varying the front end shape was predicted. Applying this method from the initial stage of front end design may contributes to acquire optimal front end snape and under hood design for cooling performance.<br/>
남성원(Nam Seong-Won),조장형(Cho Jang-Hyung) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Numerical simulation is conducted to clarify the heat transfer and fluid flow characteristics of brake disk-lining for rolling stock. Multiple rotational reference frame, k-epsilon turbulent model and SIMPLE algorithm based on finite volume method are used to solve the physical disk-lining model. The governing equations are solved by TDMA(TriDiagonal Matrix Algorithm) with line-by-line method and block correction. From the results of simulation, the characteristics of cooling pattern is strongly affected by the grooves in lining. The face lift of lining affects on the temperature distribution of rear surface of lining as well as the front surface of that. Due to the grooves in lining, it will be expected to extend the maintenance life circle of lining.
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.
풍력발전기가 설치된 고층빌딜에 대한 전산유체역학적 고찰
전완호(Jeon, Wan-Ho),윤성욱(Yoon, Seong-Wook),김욱(Kim, Wook),조장형(Cho, Jang-Hyung) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Renewable energy or green energy is a hot issue in theses days. Since wind resource can be endlessly supplied by nature, researchers and common people are interested in study how to use that resource at home or company. Especially, many architects have tried to integrate wind power generator for a part of building. So in this paper, three buildings installed wind power turbine are targed to CFD analysis and these buildings are Bahrain trade center, Discovery tower, and Pearl river tower. Bahrain trade center is the first builidng installed real wind turbine, Discovery tower is constructing at Texas, and Pearl river tower is designed and proved by china researchers. These buildings have very different type of wind power turbine and each turbine has different conditions for best power generation. Therefor this paper will focus on characteristic shape of buildings, wind power turbine type, and expected purpose of construction. Moreover, CFD analysis will show wind flow pattern and wind speed while wind is passing through wind turbine of three tall buildings. CFD analysis for three buildings make comparison the wind flow patterns with experimental result.
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.