Counter-rotating axial-flow compressor (CRAC) is a promising technology to increase the thrust-to-weight ratio of aero-engines. Self-recirculating casing treatment (SRCT) is selected to explore its stability enhancement capacity in the CRAC. In the present work, an effective SRCT is designed by the design of experiment method, and the stability improvement potential of the SRCT and its mechanism of stall margin enhancement are studied. Results show that the optimal SRCT scheme increases the stall margin by about 7.73% and without remarkable peak efficiency loss, and the overall performance of the compressor is enhanced at the near-stall condition. The SRCT improves the quality of the tip flow field by sucking out low-energy fluid and restrains the spillage of the tip leakage flow by the jet effect from the injection port. In addition, the SRCT also reduces the unsteady interference between the adjacent rotors. The effect of speed ratio on the effectiveness of SRCT is further investigated, and results indicate that the SRCT increases the stall margin of the CRAC by about 4.13–5.80% at some off-design speed ratio conditions. The speed ratio affects the first stall stage of the CRAC, thus affecting the effectiveness of the SRCT.

反向旋转轴流压气机（CRAC）是一种很有前途的提高航空发动机推重比的技术。选择自循环套管处理（SRCT）来探索其在CRAC中的稳定性增强能力。在本工作中，通过实验设计方法设计了一种有效的SRCT，并研究了SRCT的稳定性改进潜力及其失速余量增强机制。结果表明，最优SRCT方案将失速裕度提高了约7.73%，并且没有明显的峰值效率损失，并且在接近失速的情况下压缩机的整体性能得到了提升。SRCT通过吸出低能流体来提高尖端流场的质量，并通过注入口的射流效应抑制尖端泄漏流的溢出。此外，SRCT还减少了相邻转子之间的非定常干扰。进一步研究了速比对 SRCT 有效性的影响，结果表明，在某些非设计速比条件下，SRCT 使 CRAC 的失速裕度增加了约 4.13-5.80%。速比影响 CRAC 的第一失速阶段，从而影响 SRCT 的有效性。