基于形体优化方法的汽车空气动力学开发

doi:10.19562/j.chinasae.qcgc.2022.10.017

Abstract

Abstract:

Based on the Isight optimization platform and by integrating the Sculptor mesh deformation algorithm and the computational fluid dynamics simulation technique， a vehicle aerodynamic shape optimization method with multi-parameter and multi-objectives is developed. Under the given vehicle size constraints and based on the low drag shape of BYD’s Han EV， the effects of seven outer contour parameters on aerodynamic drag are investigated， leading to a drag reduction of 4.2 counts. Furthermore， an aerodynamic optimization on the electric tail spoiler is carried out by using the shape optimization method with the optimal shape combination of multi-objective aerodynamic parameters studied， an electric tail spoiler with optimum shape and posture is obtained， resulting in a total drag reduction of 6 counts and a real-axle lift force reduction of 52 counts in the end. Finally， the effectiveness and reliability of the shape optimization method adopted are verified by wind tunnel test.

Key words: vehicles, shape optimization, aerodynamics, wind drag, electric tail spoiler, wind tunnel test

Yubo Lian,Qiuli Luo,Fengli Zhang,Rongrong Zhang,Yadong Zhang. Automotive Aerodynamics Development Based on Shape Optimization Method[J].Automotive Engineering, 2022, 44(10): 1619-1626.

Figures/Tables 20

References 11

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近似模型方法	名义后背角	接近角	最小离地间隙	离去角	机舱盖前缘高度	前风挡倾角	B柱侧倾角	C_d
设计状态	17.3°	15.1°	118.1 mm	16.4°	726.0 mm	68.5°	28.4°	0.210 3
DOE最优	16.8°	13.5°	129.4 mm	15.7°	706.2 mm	69.9°	25.0°	0.206 7
三次响应面模型	17.0°	13.7°	119.5 mm	14.8°	714.9 mm	68.2°	26.6°	0.206 1

高度参数/mm	0.3	16.6	29.6	45.8
C_d	0.222	0.220	0.221	0.225
前轴升力	-0.050	-0.050	-0.049	-0.047
后轴升力	0.136	0.107	0.084	0.054

长度参数/mm	3.3	15.8	30.8	45.8
C_d	0.223	0.222	0.222	0.222
前轴升力	-0.049	-0.049	-0.049	-0.049
后轴升力	0.085	0.080	0.075	0.070

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Automotive Aerodynamics Development Based on Shape Optimization Method

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