阶梯状周向槽处理机匣扩稳效果的数值研究

Numerical investigation on stabilizing effect of the stepped circumferential groove casings

跨声速压气机单级转子的扩稳效果对整个轴流压气机的稳定性具有至关重要的作用。针对跨声速rotor37转子叶栅机匣设计了6种不同阶梯状子午截面形状周向槽,采用数值模拟的方式对比分析了不同阶梯状周向槽处理机匣的扩稳效果。研究表明:经机匣处理后,压气机的喘振裕度都得到了不同程度的提高,凹型状周向槽的综合稳定裕度提高最大,较光壁机匣提高了9%,而峰值效率只下降了0.96%;直线型状周向槽综合稳定裕度提高最低,渐扩型和渐缩型状周向槽峰值效率最低。

The stability of the single stage rotor of transonic compressor is very important to the stability of the axial compressor.In this paper,six kinds of stepped meridian sections circular grooves were designed for the transonic rotor37 cascades.The stall margin of the rotor with circumferential groove casing treatment can be increased to a certain extent,and the comprehensive stall margin of concave circumferential groove has been increased mostly,compared with the smooth casing,the stall margin has increased 9%,but the peak efficiency has only decreased by 0.96%.The comprehensive stall margin of linear circumferential grooves is the lowest,while the peak efficiency of tapered and tapered circular grooves is the lowest.