汽车底部复杂流场的主动和被动控制减阻方法研究*

doi:10.19562/j.chinasae.qcgc.2019.05.009

Abstract

Abstract: In view of the problem existing in the complex flow field structure of car underbody and its effects on fuel economy, with a goal of reducing aerodynamic drag, CFD technique is used to study the active and passive drag reduction methods for the complex flow field of car underbody in sidewind condition,and four drag reduction schemes including spoiler, side-skirts, underbody suction control slot and wake jet flow control slot are designed to analyze the effects of schemes on aerodynamic drag and the mechanism of drag reduction. The results show that the effects of drag reduction is related to yaw angle, spoiler height, the height of side-skirts, the suction speed of underbody control slot and the injection speed and injection angle of wake jet, and the maximum drag reduction of four schemes are 9.4%, 10.4%, 13.5% and 4.7% respectively. During practical use, dynamic control method should be adopted according to vehicle running environment to achieve optimal drag reduction effect. The numerical calculation method is validated by the wind tunnel test on car model. The results of the study provide references for vehicle design.

Key words: aerodynamic drag, spoiler, side-skirts, underbody suction control slot, wake jet control slot, dynamic control method

Yuan Zhiqun, Yang Mingzhi, Zhang Bingrong. A Study on Car Drag Reduction by Active and PassiveControl of Complex Underbody Flow Field[J].Automotive Engineering, 2019, 41(5): 537-544.

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A Study on Car Drag Reduction by Active and PassiveControl of Complex Underbody Flow Field

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