关键词: 汽车环境舱, 流场特性, 数值仿真, 流场实验, 流场优化

Abstract: The experimental method was used to study the wind velocity distribution， boundary layer thickness， axial static pressure gradient and dynamic pressure stability and other flow field characteristics in the vehicle climatic chambers without a car. The numerical simulation method was used to establish a 1∶1 model of the vehicle climatic chambers， and the interference effects of various experimental facilities and equipment on the flow field in the climatic chambers were considered， and the numerical simulation of the flow field distribution in the climatic chambers was conducted. The results show that the flow field in the vehicle climatic chambers is relatively turbulent， and the flow field in the test section results show a dispersive jet state. The wind speed distribution at the outlet of the main fan is not uniform， and the difference between the highest and lowest wind speeds is as 36 km/h. The wind speed decays significantly after the airflow from the fan， and the axial static pressure gradient changes greatly. The boundary layer of the airflow in the test section is thicker， and the thickness of the boundary layer increases the farther away from the fan center direction. The numerical simulation results show that the installation position and size of the main fan have some influences on the flow field of the climatic chambers， and increasing the size of the fan outlet may improve the flow field quality of the climatic chamber test sections. 

Key words: vehicle climatic chamber, flow field characteristic, numerical simulation, flow field experiment, flow field optimization