摘要
Abstract
Large area expansion can be achieved effectively by wide angle diffusers in wind tunnels, while the airflow separation may occur at the same time. In order to ensure the flow field quality, the sep—aration must be suppressed. Utilizing damp—screens with reasonable parameters is a valid method in engi—neering. With the background of 0. 6m continuum transonic wind tunnel, so as to test the engineering de—sign method of damp—screens, we verify the preliminary result by the method through the way of numerical simulation. From the calculation, by taking the scheme 3—4, loss coefficients for two screens are 1. 6 and 1. 0 respectively, the RMS value at the outlet of the wide angle diffuser will be 14. 5% ; considering the in—fluence by the environment and adjusting the two coefficients to 0. 8 and 1. 0, the RMS value will be 16. 2% . The research indicates that, the engineering design method, in addition to numerical simulations, can be effectively applied in the design of wide angle diffusers. Suppressing the airflow separation, reduc—ing the pressure loss, and improving the exit velocity uniformity can be achieved simultaneously.关键词
连续式风洞/跨声速/大开角段/阻尼网/数值模拟/流场品质Key words
continuous wind tunnel/transonic/wide angle diffuser/screen/numerical simulation/flow quality分类
航空航天
