In order to further expand the stability margin of the compressor,four shrinkage clearance dis-tribution schemes of 25％c,50％c,75％c and 100％c were proposed based on the parallel gap distribu-tion scheme.The mechanism of the influence of shrinkage clearance distribution on compressor perform-ance and flow field structure was explored using steady-state numerical simulation methods.The research results indicate that the shrinkage clearance distribution can promote the downstream movement of the leakage vortex,keeping it away from the leading edge of the rotor blade tip.As the range of the contrac-tion 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 shrinkage clearance distribution schemes finds 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 basi-cally unchanged.The compressor flow range is significantly expanded,and the compressor stability mar-gin improvement(SMI)is increased by 2.28％.
关键词
叶尖间隙/收缩间隙分布/跨声速压气机/间隙改型
Key words
tip clearance/shrinkage clearance distribution/transonic compressor/clearance modification
维普
万方数据