倾斜周向槽机匣处理对跨音速压气机流动特性的影响

Influence of Inclined Circumferential Groove Casing Treatment on Flow Characteristic of Transonic Compressor

为研究倾斜周向槽机匣处理对跨音速轴流压气机稳定性的影响,以Rotor37为研究对象,通过数值模拟方法对比研究了径向与倾斜周向槽的扩稳效果。结果表明:在设计转速下,采用3种不同形式的周向槽机匣处理都能够提高压气机的稳定裕度;径向周向槽时稳定裕度提高5.08%,周向槽后倾时提高6.1%,前倾时提高3.75%;径向形式时转子效率最高,前倾形式次之,后倾形式槽内周向环流更复杂,能量损失最大,效率最低。当周向槽轴向倾斜方向不同时,会使周向截面、泄漏流和槽内流动发生变化,对压气机的稳定裕度和效率造成影响。

In order to research the influence of inclined circumferential groove casing treatment on stability of transonic axial compressor, Rotor37 is taken as the research object. By means of numerical simulation, the expansion effect of radial and inclined circumferential groove is compared and researched. The results indicate that under the design speed, the circumferential groove casing treatment in three forms can improve the stall margin of compressor;the stall margin increased by 5.08% in radial form circumferential groove, increased by 6.1% when circumferential groove is inclined backward and 3.75% when circumferential groove is inclined forward. The rotor efficiency is the highest in radial, followed by incline forward form. When inclining backward, circumferential circulation flow inside groove is more complex with highest energy loss while lowest efficiency. The different inclination directions of circumferential groove will change the flow in circumferential cross section, leakage flow and slot flow, which affects the stall margin and efficiency of compressor.