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- 저자 : 전정균(Jeongkyun Jeon) (검색결과 1 건)
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김민호(Minho Kim),전정균(Jeongkyun Jeon),박영범(Youngberm Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The aerodynamic characteristics of automobiles have received substantial interest recently. Detailed knowledge of vehicle aerodynamics is essential to improve fuel efficiency and enhance stability at high-speed cruising. In this study, a numerical simulation has been carried out for in order to investigate the effect of a front-spoiler attached at the front of the bus body. In the first step, for the 1/2 bus scale model, wind tunnel test was performed to verify the effectiveness of digital wind tunnel. In this stage, prediction results on the aerodynamic coefficients and surface pressure on the center line of bus body were compared with those of wind tunnel test. In the second step, a numerical simulation has been carried out for the detailed actual bus model to obtain the effect of add-on devices such as undercover, roof spoiler. Flow characteristics and potential of drag reduction for each add-on device was thoroughly investigated. As a result of this study, it is confirmed that the digital wind tunnel results regarding surface pressure and drag force agrees well with those of wind tunnel test. In particular, based on the detailed flow information on the flow causing a serious aerodynamic drag, an effect of front spoiler on the drag and flow behavior around air conditioning system was investigated through digital wind tunnel simulation The results also show that aerodynamic drag for large-sized bus can be reduced by 6% with the use of front spoiler.
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