角向倾斜缝处理机匣对压气机性能的影响

Effects of Blade-Angle Skewed Slots Casing Treatment on Compressor Performance

为了揭示角向缝、角向倾斜缝处理机匣对压气机性能及其流场的影响,采用试验与非定常数值模拟的方法针对一亚声轴流压气机进行了研究。结果表明,角向缝、角向倾斜缝处理机匣(前移)对应的综合裕度改进量分别为12.16%,39.60%;角向倾斜缝处理机匣的扩稳能力更强,且峰值等熵效率损失降低了约75%。通过详细地分析压气机叶顶流场表明,角向倾斜缝处理机匣能够将叶顶间隙泄漏流在膨胀扩散之前基本完全吸除,通道内几乎没有低速堵塞区出现,因而扩稳效果更好。同时从角向倾斜缝中喷射入叶顶前缘的气流径向分速较低,其与主流的相互作用较弱,故流动损失减小,等熵效率更高。

In order to reveal the effects of blade-angle slots and blade-angle skewed slots casing treatment on the compressor＇s performance and flow-field,a subsonic axial-flow compressor was studied by means of experiment and unsteady numerical simulation. The results show that the stall margin improvement is 12.16% and39.60% for the blade-angle slots and blade-angle skewed slots casing treatment（move forward）respectively.The ability to improve stall margin is stronger,and the loss of peak isentropic efficiency is lower about 75% for the blade-angle skewed slots casing treatment. The detail analysis of compressor tip flow-field indicates that the tip clearance leakage flow is basically completely sucked before expansion and diffusion,and the low speed blockage area almost disappears in the tip blade passage. So the effect of stability enhancement is better for the blade-angle skewed slots casing treatment. At the same time,the radial velocity of the airflow becomes lower injected into the leading edge of the tip blade from blade-angle skewed slots,the interaction between injected flow and blade tip mainstream is weaker. Therefore the flow loss is reduced,and the isentropic efficiency is improved for blade-angle skewed slots casing treatment.