基于抽吸的亚声速平面叶栅风洞流场品质控制研究

Improving the flow quality of linear cascade wind tunnel is particularly important for obtaining high-quality, low-uncertainty test results. Two suction schemes are set at different positions on the upper side of the test section and the effect of suction slot position and suction flow rate on the flow field quality of cascade wind tunnel flow are investigated by numerical simulation. The results show that the upper sidewall suctions were demonstrated to be effective in improving inflow uniformity and outflow periodicity of these three blade passages near upper sidewall, among which the inlet Mach number deviation is no more than 0.01, and the flow angle deviation is no more than 0.5°.Suction between the movable upper wall and the first blade(Cavity A)can effectively improve the inflow uniformity of the cascade, but the outflow periodicity increases little. Suction at the middle back of suction side of the first blade(Cavity B)can both improving the quality of inflow and outflow. The suction scheme of Cavity A is more flexible in engineering application than the suction scheme of Cavity B, but the critical suction flow rate has tripled.