轴向偏转型自循环机匣处理对高速压气机扩稳效果的影响机理

Influence Mechanism of Axial Deflection Self-Circulating Casing Treatment on Stability Enhancement of High-Speed Compressor

关键词:  轴流压气机  自循环机匣处理  轴向偏转角  数值模拟  机理分析

Key words:  Axial flow compressor  Self-recirculating casing treatment  Axial deflection angle  Numerical simulation  Mechanism analysis

摘要:

为了削弱叶顶泄漏流的不利影响，扩大轴流压气机的稳定工作范围，提出了一种改进的轴向偏转型自循环机匣处理结构，偏转角度为叶片顶部弦长与压气机轴向的夹角。以高速轴流压气机的孤立转子为研究对象，设计了正偏和反偏2种轴向偏转型自循环机匣处理方案，进行了单通道非定常数值模拟。结果表明：相对于实壁机匣，压气机在正偏、反偏自循环机匣处理时的综合稳定裕度分别增加了11.52%，10.15%，峰值效率仅分别下降了0.32%，0.59%。轴向正偏型自循环机匣处理比轴向反偏型自循环机匣处理的扩稳效果更好，而且效率下降更少。

Abstract:

In order to weaken the negative effect of tip leakage flow and expand the stable working range of axial compressor， an improved axial deflection self-recirculating casing treatment structure was proposed. The deflection angle is the angle between the chord length of the blade top and the axial direction of the compressor. Taking an isolated rotor of high-speed axial compressor as the research object， two kinds of treatment schemes of deflection type self-recirculation casing， positive and reverse deflection， were designed firstly， and then a single channel unsteady numerical simulation was carried out. The results show that， compared with the solid wall casing， the comprehensive stability margin of the compressor increased by 11.52% and 10.15%， respectively when it is treated with positive and negative deflection self-recirculation casing， and the peak efficiency only decreases by 0.32% and 0.59%， respectively. Compared with the axial negative deflection self-recirculation treatment， the axial positive deflection self-recirculation has better stability expansion effect and less efficiency reduction.