带侧翼式扩散器对汽车气动特性影响研究

doi:10.19562/j.chinasae.qcgc.2021.11.011

Abstract

Abstract:

In order to study the influences of the side-wing diffuser on the aerodynamic characteristics of a car， a side-wing diffuser is installed on the CAERI Aero Model， and a computational fluid dynamics （CFD） software is used to simulate the aerodynamic drag and lift force of vehicle with diffuser installed at different angles， and compared with general plane diffuser， in which the simulation result of the plane diffuser with a certain installation angle has been verified by wind tunnel test to conform the reliability of the simulation. The results of simulation show that the side-wing diffuser can change the distribution of vortex structure at the bottom and tail of the vehicle. Compared with the plane diffuser， the side-wing diffuser can effectively reduce the aerodynamic lift of the vehicle at different installation angles of diffuser， with the maximum declining rate of aerodynamic lift force reaching 38.1% at an installation angle α = 10.5°. The side-wing diffuser can greatly reduce the aerodynamic lift with a trivial increase of aerodynamic drag， effectively enhancing the driving stability and safety of vehicle.

Key words: CAERI Aero Model, diffuser, aerodynamic drag, aerodynamic lift

Hong Liao,Yaohui Lu,Qingyang Wang,Xiaochun Yin,Xiaobo Shi,Yanhui Tang. Research on the Influences of Side-Wing Diffuser on Automotive Aerodynamic Characteristics[J].Automotive Engineering, 2021, 43(11): 1653-1661.

Figures/Tables 20

References 16

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参数	正投影面积/m²	风阻系数
试验测试值	2.173	0.250
CFD计算值	2.169	0.248
误差	0.2%	0.8%

扩散器角度α/（°）	直板式扩散器	带侧翼式扩散器	减小率/%
3	0.234	0.236	-0.8
4.5	0.238	0.240	-0.8
6	0.240	0.243	-1.3
7.5	0.243	0.245	-0.8
9	0.248	0.249	-0.4
10.5	0.248	0.250	-0.8
12	0.251	0.253	-0.8

扩散器角度α/（°）	直板式扩散器	带侧翼式扩散器	减小率/%
3	0.046	0.045	2.2
4.5	0.044	0.041	6.8
6	0.043	0.040	7.0
7.5	0.043	0.039	9.3
9	0.039	0.029	25.6
10.5	0.042	0.026	38.1
12	0.043	0.028	34.9

Research on the Influences of Side-Wing Diffuser on Automotive Aerodynamic Characteristics

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