带尾缘吹气的动静干涉流动的实验

Experimental investigation on stator-rotor interaction flow with trailing edge blowing stator

采用声学麦克风和粒子图像速度仪等实验研究手段,分析静子在吹气和不吹气情况下纯尾迹、弱尾迹、无动量亏损尾迹和射流四种尾迹流动与动叶相互干涉的声学特性和流场特性.得到了不同尾部吹气量下动静之间流场的速度矢量变化以及静子尾迹在动叶流道中的传播特性.比较了静子尾缘纯尾迹与弱尾迹、无动量亏损尾迹以及喷射等尾迹形态与动叶相互干涉的流场,分析了静子尾缘吹气使静子尾缘达到无动量亏损尾迹状态,改善了动叶的进气气流角.通过对比气动性能以及噪声性能,说明静子尾缘吹气后动叶的气动性能变化不大,能降低离散频率噪声.

The mixed flow field and noise characteristic of the stator wake interaction with rotor with/without injection through a slit along the stator＇s rear end was investigated using noise measurement equipments and particle image velocimetry.In the velocity fields,the spreading characteristics of the wakes across the rotor row were gained.The interaction flow field between pure wake and rotor was compared with the flow field between weak wake,momentumless wake,jet and rotors.The results show that the momentumless wakes make the inlet flow of the rotor more uniform,and improve the inlet flow angle of the rotor.By comparing aerodynamic and aeroacoustic performance,the trailing edge blowing up to momentumless wake can reduce BPF（blade-passing-frequency） noise,and has little effect to the aerodynamic performance.