关键词: 金属丝网机匣处理, 轴向位置, 腔深, 失速裕度, 扩稳机理

Abstract: To explore the influence and stabilization mechanism of key structural parameters of the Wire Mesh Casing Treatment (WMCT) on compressor stability, this paper investigates the effects of the axial installation position and cavity depth of WMCT. Based on experimental and numerical simulation methods, the stabilization effects of WMCT at five axial positions were first studied. Combined with the variation laws of three-dimensional flow field structures and macroscopic performance parameters, the mechanism of the axial position on compressor stability was analyzed. For WMCT covering the rotor tip leading edge, it reduces the angle between the tip leakage vortex and the blade suction surface, delaying the occurrence of flow separation on the pressure side. For the case near the mid-span region without covering the tip leading edge, WMCT reorganizes the flow structure in the covered area, blocks the development of the tip leakage vortex in the blade passage, and delays the stall inception. When the axial position is 20 mm, the stabilization effect is relatively optimal. On this basis, three cavity depths were further studied. The results show that cavity depth has a significant effect on relieving the blockage in the tip region, and the effect becomes stronger with increasing depth. When the cavity depth exceeds 10 mm, further increase has little impact. Regarding the stabilization mechanism, WMCT improves flow stability by adjusting the steady aerodynamic load distribution of the rotor blades and suppressing the amplitude of unsteady stall precursor disturbances, thus expanding the stability margin of the compression system.

Key words: wire mesh casing treatment, axial position, cavity depth, stall margin, stabilization mechanism