| Citation: | XUE Pengfei, LIU Zhengxian, LI Xiaojian, et al. Multi-component coupling optimization for stability improvement of transonic centrifugal compressor[J]. Journal of Aerospace Power, 2023, 38（2）：491-503 doi: 10.13224/j.cnki.jasp.20210427
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Based on the optimal Latin hypercube sampling, polynomial surrogate model, Fourier amplitude sensitivity test, and gradient mutation hybrid optimization algorithm, a coupling optimization method of transonic centrifugal compressors was constructed, and the goal of self-recirculation casing treatment stability improvement without loss of isentropic efficiency was achieved. After the coupling optimization, the aerodynamic performance of the compressor was comprehensively improved. The isentropic efficiency of the design point and near-stall point increased by 2.79% and 1.82%, respectively, and the peak efficiency was slightly higher than the solid compressor. According to the mechanisms of coupling optimization for stabilization and efficiency enhancement: the recirculation flow of self-recirculation casing treatment was increased, and more low-energy fluid was removed; the flow incidence angle of impeller was improved, and the risk of flow separation was reduced; the interaction of leading edge shock wave and the tip leakage vortex was suppressed, the low-energy fluid downstream the impeller was reduced, and the circumferential uniformity of the flow was enhanced; the injection angle of upstream slot of the casing treatment was increased, and the radial distortion of the impeller inlet was weakened; the increases of both the blade angle of the impeller trailing edge and the radius of the diffuser blade trailing edge made up for the isentropic efficiency loss; the reduction of the back sweep of the impeller blade leading edge made up for the choke flow.
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