Research on Non-smooth Surfaces for Control of the Automobile Trailing Vortex Structure

doi:10.3901/JME.2016.08.133

Abstract

Abstract: The aerodynamic drag of the body directly affects the power performance and fuel economy of the vehicle. Trailing vortex structure for vehicle has great effect on the formation of air resistance. The reasonable arrangement of the non-smooth structure in the body can effectively reduce the air resistance of the car. In order to study the influence and control to automobile tail vortex of the structure of non-smooth body, this article has pit type non-smooth units respectively arranging in the MIRA ladder back model of the top of the automobile and the trunk deck surface and the top of the automobile tail. By using the method of computational fluid dynamics(CFD) numerical simulation and wind tunnel test combination to comparative analysis of non-smooth surface of the tail of the model of pressure, turbulent dissipation rate, velocity vector and the effects of other parameters. The effect of non-smooth structure perturbation and the control of the formation of wake vortex are investigated. Concluded that the non-smooth structure can delay the flow separation,control the wind window on the cat and the tail vortex shear vortex and restrain the generation of the main vortex in the rear end of the vehicle. For the effective controlling of the wake vortex structure of the automobile, inhibition of vortex-induced vibration, improving the aerodynamic characteristics of the car to provide important basis.

Key words: aerodynamic characteristics, car body, disturbance effect, non-smooth surface, trailing vortex, wind tunnel test

CLC Number:

U463

YANG Yi, HUANG Jianfeng, FAN Guanghui, CAI Shengkang, LIU Zheng. Research on Non-smooth Surfaces for Control of the Automobile Trailing Vortex Structure[J]. Journal of Mechanical Engineering, 2016, 52(8): 133-140.

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