基于抽吸的亚声速平面叶栅风洞流场品质控制研究

Flow Field Quality Control of Subsonic Linear Cascade Wind Tunnel Based on Suction

关键词:  叶轮机械  平面叶栅  风洞  流场  抽吸  数值模拟

Key words:  Turbomachinery  Linear cascade  Wind tunnel  Flow field  Suction  Numerical simulation

摘要:

为提升平面叶栅风洞流场品质，获取高质量、低不确定性的试验结果，设计了位于试验段上侧壁不同位置处的两种抽吸方案，采用数值模拟方法研究了抽吸槽位置以及抽吸流量对平面叶栅风洞流场品质的控制效果。研究结果表明：在试验段上侧壁进行抽吸能够提升靠近上侧壁的三个叶栅通道的均匀性和周期性，使进口马赫数偏差<0.01，进气角偏差<0.5°；在可移动上侧壁和叶栅首叶片之间进行抽吸（Cavity A）对叶栅进口均匀性提升较大，但对出口周期性提升很小；在叶栅首叶片吸力面中后部进行抽吸（Cavity B）能够同时提升进口均匀性和出口周期性；Cavity A抽吸方案比Cavity B具有更好的工程应用性，但临界抽吸流量增加了两倍。

Abstract:

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.