关键词: 排放环境模拟舱；风洞试验；计算流体动力学；数值仿真；开放道路；流场差异

Abstract: The vehicle emission environment simulation chamber is used for the high and low temperature performance test of the vehicle, and the flow field distribution in the environment chamber is very important to evaluate the vehicle performance. In this paper, experimental and numerical simulation methods are used to analyze the differences of vehicle flow field in an emission environment simulation chamber, wind tunnel and open road. The results show that the vehicle emission environment simulation cabin has obvious blocking effect compared with the vehicle wind tunnel, which has significant influence on the roof pressure distribution, cabin cooling and chassis flow field, and the surface velocity of the radiator in the cabin is 19% lower than that on the road; and the velocity deviation of the chassis flow field from front to back gradually decreases, with the maximum deviation near the front suspension reaching 50%, and the deviation near the tail row is at least 10%. The results can provide useful reference for evaluating the cooling performance of the cabin, the comfort performance of the cabin and the thermal damage performance of the chassis by using the emission environment simulation cabin.

Key words: Emission environment simulation chamber; Wind tunnel test; Computational fluid dynamics; Numerical simulation; Open road; Flow field difference