Comparative Study on Flow Field Quality of Climatic Wind Tunnel and Climatic Chamber

Abstract:

The flow field quality of the vehicle climatic wind tunnel and climatic chamber directly affects the accuracy of the vehicle thermal and aerodynamic performance test results in a climatic laboratory. By combining experiment and the CFD method， the flow field differences between climatic wind tunnel and climatic chamber were studied. First， the primary flow field parameters， such as speed uniformity， boundary layer thickness， kinetic pressure stability and axial static pressure gradient were tested. Using the CFD method， the flow field numerical values were simulated for climatic wind tunnel and climatic chamber. By comparing the overall flow field characteristics of the climatic wind tunnel and climatic chamber， the factors affecting the difference of flow field quality were analyzed. The experimental and numerical simulation results showed that the flow field quality of the climatic wind tunnel was obviously superior to that in the climatic chamber， such as speed uniformity， boundary layer， axial static pressure gradient， kinetic pressure stability， air flow， and wind speed distribution.

Key words:vehicle climatic wind tunnel;vehicle climatic chamber;flow field quality;numerical simulation