Journal of Shanghai Jiaotong University ›› 2020, Vol. 54 ›› Issue (7): 745-755.doi: 10.16183/j.cnki.jsjtu.2019.040

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Experimental and Numerical Study of Compressor Tip Leakage Flow Based on Arc-Curve Skewed Slot Casing Treatment

WU Yadong a,b,LI Tao a,ZHANG Yongjie a   

  1. a. School of Mechanical Engineering; b. Engineering Center of the Ministry of Education for Gas Turbine and Civil Aviation Engines, Shanghai Jiao Tong University, Shanghai 200240, China
  • Online:2020-07-28 Published:2020-07-31

Abstract: To explore the influence of casing treatment on compressor overall performance, flow unsteadiness, and rotating instability (RI) at blade tip region, arc-curve skewed slot casing treatment is applied to the passive control of the tip clearance flow of a single-stage low-speed axial compressor. The spectrum analysis of blade tip fluctuating pressure under different operating conditions is conducted, and the changes of performance and flow field characteristics at rotor tip region before and after casing treatment are compared. The results show that arc-curve skewed slot casing treatment could increase stall margin by 6.8%, suppress the broadband hump in the frequency spectrum caused by RI, delay the starting position of the leakage vortex, and eliminate the circumferential flow propagation across adjacent blades. The backflow formed in the skewed slot can suck low-velocity fluid, reduce the blockage in the flow passage, and improve the flow capacity near blade tip.

Key words: axial compressor, rotating instability (RI), casing treatment, tip leakage flow

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