Abstract: The study was to explore an effective method to improve the stall margin of a transonic compressor at different operating speeds. The slot casing treatment and tip injection is coupled to enhance compressor stability. The effects of slots’ number, length, width and the circumferential width of injectors on the compressor
performance were studied parametrically. Mechanism of stability enhancement was 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, and the compressor efficiency at the design point is decreased by 0.77%, 0.23% and 0.41% correspondingly. The slots’ number, length and width have great effects on the stall margin and efficiency of the compressor, while the circumferential width of the nozzle has little effect on the compressor performance. A flow cycle composing of suction and injection is formed in the coupled casing treatment. The increase of coupling strength is beneficial to the improvement of stall margin, and detrimental to the compressor efficiency. The coupling casing treatment lead to the increase of the blade tip loading, but it can reduce the tip leakage intensity, and eliminates the tip blockage caused by tip leakage vortex, which is the main reason for the improvement of compressor stall margin. The coupling casing treatment has the potential to enhance effectively the compressor stability at different speeds.
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