为了进一步拓宽压气机稳定裕度,在平行间隙分布方案(Baseline)基础上,提出四种收缩间隙分布方案(25%c、50%c、75%c和100%c),利用定常数值模拟的方法,探究收缩间隙分布对压气机性能及流场结构的影响机理。研究结果表明,收缩间隙分布能够促进泄漏涡向下游移动,使泄漏涡远离转子叶尖前缘。然而随着收缩段范围的增加,泄漏涡尺度和压力面附近涡团范围增大,间隙区域的堵塞效应增强。综合比较四种收缩间隙分布方案发现,25%c方案能够有效抑制间隙区域的堵塞效应,近失速点总压比和效率基本不变,压气机流量范围得到明显拓宽,压气机稳定裕度改进量(SMI)提升2.28%。

In order to further expand the stability margin of the compressor, four contraction gap distribution schemes (25%c, 50%c, 75%c, and 100%c) were proposed based on the parallel gap distribution scheme (Baseline). The mechanism of the influence of contraction gap distribution on compressor performance and flow field structure was explored using steady-state numerical simulation methods. The research results indicate that the contraction gap distribution can promote the downstream movement of the leakage vortex, keeping it away from the leading edge of the rotor blade tip. However, as the range of the contraction section increases, the scale of the leakage vortex and the range of vortex clusters near the pressure surface increase, and the blockage effect in the gap area increases. A comprehensive comparison of the four contraction gap distribution schemes found that the 25% c scheme can effectively suppress the blockage effect in the gap area, and the total pressure ratio and efficiency near the stall point remain basically unchanged. The compressor flow range is significantly expanded, and the compressor stability margin improvement (SMI) is increased by 2.28%.