轴向斜缝机匣处理与转子通道之间耦合流动分析

轴向斜缝机匣处理能够有效地扩大压气机的稳定工作范围,本文对轴向斜缝处理机匣与亚音速压气机转子通道之间的耦合流动进行了时间精确的全三维数值模拟,数值结果所获得的总性能与试验结果符合较好。详细分析了处理机匣与转子通道之间非定常干涉现象以及处理机匣结构引入后转子顶部区域不同的流场结构,数值计算结果表明,对具有高损失高阻塞效应的间隙泄漏流及其间隙泄漏涡的控制是轴向斜缝机匣处理扩大压气机稳定工作裕度的主要原因。

ANALYSIS OF THE COUPLED FLOW THROUGH AXIAL SKEWED SLOTS CASING TREATMENT AND ROTOR PASSAGE

Axial skewed slot casing treatment is known as a powerful method to improve the stall margin of compressor. A time accurate 3-dimentional numerical simulation of the coupled flow through a subsonic axial-flow compressor rotor passage and axial skewed slots casing treatment was presented in this paper. The numerical results agreed well with experimental test data for estimation of the global performance. The different tip flow topology of the compressor rotor with axial skewed slots casing treatment and the unsteady interaction between rotor passage and axial skewed slots casing treatment were detailed analyzed. The numerical results showed that the control of the high loss, high blockage tip leakage flow and its vortex is the basic mechanism which are responsible for the stabilizing impact of casing treatments.