自循环机匣处理改善堵塞和过载型失速转子稳定性的研究

This work used numerical methods to study on improving the stability of a rotor with both blocked and overloaded type stall by the self-circulating casing treatment (SCT). The study found that for the rotor whose tip flow field was aggravated by the low velocity flow zone induced by tip leakage flow and the suction surface flow separation, the SCT can only achieve significant enhancing stability effect by simultaneously considering its suction effect and jet effect, that is, suppressing both the low velocity flow zone induced by tip leakage flow and suction surface flow separation. When the suction position covers the most blockage zone in the blade passage, the enhancing stability effect of the SCT is the best, and the stall margin improvement of the rotor is as high as 12.86%. The study on the mechanism of enhancing stability found that, the jet effect of the SCT can improve the inlet condition of blade tip and restrain the tip leakage flow, the suction effect can suction the low velocity flow zone. Under the combined action of jet effect and suction effect, the breakdown of tip leakage vortex and flow separation of suction surface are inhibited, and the blade tip flow condition is improved, thus the aerodynamic stability of rotor is improved.