| Citation: | GUO Yanchao, GAO Limin, MAO Xiaochen, et al. Unsteady effect on casing treatment in counter-rotating axial flow compressor[J]. Journal of Aerospace Power, 2023, 38（3）：685-697 doi: 10.13224/j.cnki.jasp.20210508
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In order to reveal the difference between the stability enhancement mechanism and the loss of different forms of casing treatment, a two-stage counter-rotating axial flow compressor (CRAC) was taken as the research object, the stability enhancement mechanism of self-recirculating casing treatment (SRCT) and axial slot casing treatment (ASCT) was studied by unsteady numerical simulations. The results showed that both SRCT and ASCT significantly improved the stall margin and total pressure ratio at the near-stall point, and increased the efficiency loss at the peak efficiency point. The casing treatment reduced the dynamic-dynamic interference effect between the two rotors by acting on the tip leakage flow and suppressing the pressure potential flow. The flow in axial slots was related to the relative position of the rotor. The periodic sweeping of the rotor to the casing treatment slots increased the unsteadiness of flow in casing treatment slots, and the mixing of the flow in casing treatment slots was the main reason for the decrease of efficiency.
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