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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (1): 124942.doi: 10.7527/S1000-6893.2021.24942

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Coupling method for stability improvement for transonic compressor at variable speed

ZHAO Le1, WANG Wei1,2, ZHANG Lefu1,2, WANG Weichao1, LU Jinling1,2, CHU Wuli3,4   

  1. 1. Faculty of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China;
    2. State Key Laboratory of Eco-hydraulic in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China;
    3. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;
    4. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China
  • Received:2020-11-02 Revised:2021-01-04 Online:2022-01-15 Published:2022-02-14
  • Supported by:
    China Postdoctoral Science Foundation (2020M683525); National Key R & D Program of China(2018YFB1501900); National Natural Science Foundation of China (51879216,51679195); Scientific Research Projects of Shaanxi Provincial Department of Education(19JK0587)

Abstract: To explore an effective method to improve the stall margin of a transonic compressor at different operating speeds, this study couples the slot casing treatment and tip injection to enhance the compressor stability. The effects of the number, length, width of the slots and the nozzle circumferential width on the compressor performance are studied parametrically, and the mechanism of stability enhancement is revealed using unsteady numerical simulations. The results show that the stall margin increases by 9.31%, 8.26% and 8.68% at 100%, 80% and 60% speed, respectively, while the compressor efficiency at the design point is decreased correspondingly by 0.77%, 0.23% and 0.41%. The number, length and width of the slots have significant effects on the stall margin and the efficiency of the compressor, while the circumferential width of the nozzle has little effect on the compressor performance. A flow cycle composed of suction and injection is formed in the coupled casing treatment. The increase of the coupling strength is beneficial to the improvement of the stall margin, and detrimental to the compressor efficiency. The coupling casing treatment leads to the increase of the blade tip loading, meanwhile reducing the tip leakage intensity and eliminating the tip blockage caused by the tip leakage vortex, which is the main reason for the improvement of the compressor stall margin. The coupling casing treatment has the potential to enhance effectively the compressor stability at different speeds.

Key words: transonic compressor, variable speeds, coupling casing treatment, stall margin, tip leakage vortex

CLC Number: