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전면 스포일러 형상과 FEAF(Front end air flow) 유량 변화에 따른 상관성 분석 및 Drag coefficient 영향에 관한 해석적 연구
유연준(Yeunjun Yoo),김성현(Sunghyun Kim),하종백(Jongpaek Ha) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Front spoiler lip(FSL) has been recognized as fining sporty exterior. However the impact of FSL is classified in two categories defined coefficient of drag and front end air flow. These two kinds of engineering definition are related to fuel economy and engine durability. As comprehensive meaning, the air pollution may be controlled through materializing optimized design parameters of front spoiler lip and vehicle life cycle may be lengthened. Most of automotive makers have their own design concept of front fascia bumper and execute for excellent aero/CFD performance in an early stage of the development phase of a new vehicle. For the optimized geometry, a 3-D computational program is used to consider appropriate aero performance and flow pattern, which results in steady and numerical data is used for calculating required air flow. Based on these numerical method is developed and validated for taking a direction for full vehicle..
Grille opening size 변화에 따른 soaking구간에서의 underhood 온도변화에 대한 해석적 연구
유연준(Yeunjun Yoo),이충혁(Chunghyuk Lee),하종백(Jongpaek Ha),이태원(Taewon Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Heat source information on design parameters of components located in and underbody are required because these parameters affect final heat damage. Most of automotive makers have their own data of heat impact on the relationship between design parameters and heat source, which was mostly obtained by experimental and trial-and-error methods in the past. Thermal soak study and issues execute in an early stage of the development phase of a new vehicle. Thermal soak results from vehicle with high load after driving and shutting off engine. Underhood and underbody flow are stagnant pattern, and these are simulated by natural convection. At this time, the components close to exhaust system are affected by thermal fluid. For the complex geometry, a 3-D computational program is used to consider heat transfer, which results in steady and transient analysis. Based on these premises a numerical method is developed and validated for a simplified test case as well as for a full vehicle.
수치 해석을 통한 비대칭 AC 토출구가 적용된 Ventilation duct system의 유동 분배 최적화
김윤희(Yoonhee Kim),김용년(Yongnyun Kim),유연준(Yeunjun Yoo),송봉하(Bongha Song) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Recently, it is being important to enhance interior styling for improvement of the emotional quality in vehicle development trend. Also, the cabin is important to have more comfortable environment in company with improving quality of living. Air comport of the cabin is dependent on HVAC system. The main control factor of the HVAC system is performance of HVAC module, position of outlet, air flow distribution thru outlet and air duct shape. Improving the air ventilation performance in cabin is affected by outlet parts of vehicle and the whole vehicle system which is related with air duct. When designing a duct to minimize pressure drop of the air flow passing through cross-section of air duct, it is difficult to deliver air quantity that will satisfy the compartment passengers in the packaging constraints imposed by outlet and structures contained in the instrument panel. In this study, non-symmetrical HVAC ventilation duct is developed and flowfield inside this non-symmetrical HVAC ventilation system was studied. Flow characteristics inside of duct was analyzed to have low pressure drop, and optimized ventilation duct having even flow distribution for each outlet was developed.