| Citation: | GAO Limin, WANG Lei, MAO Xiaochen, et al. Mechanism of stability improvement with slot casing treatment in counter-rotating compressor[J]. Journal of Aerospace Power, 2023, 38（3）：640-654 doi: 10.13224/j.cnki.jasp.20210459
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In order to explore the applicability of slot casing treatment in counter-rotating compressors, the effects of slot casing treatment on the aerodynamic performance and stability margin of a counter-rotating compressor were investigated by numerical simulation. The effect of the slot casing treatment on overall performance of the compressor and tip flow field was analyzed to reveal the stall margin improvement mechanism of the slot casing treatment in the counter-rotating compressor. The study showed that the slot casing treatment can improve the stability margin of the counter-rotating compressor, and the axial position of the casing treatment had a significant impact on the aerodynamic performance and stability margin of the counter-rotating compressor. With the forward movement of the casing treatment, the peak efficiency loss of the counter-rotating compressor gradually decreased, while the stall margin improvement was not much different. The combined effect of bleed and injection of the slots slowed down the degree of blockage in the rotor R2 blade tip passage, and achieved stability improvement by suppressing the development of tip leakage flow and secondary leakage flow. In addition, the slot casing treatment may change the first stall stage of this counter-rotating compressor, demonstrating the effectiveness of slot casing treatment in the expansion of stability under variable operating conditions.
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