| Citation: | KONG Xiaozhi, HUANG Tianshuo, LIU Yuxin, et al. Influences of the cavity leakage flow on shrouded stator performance at different inlet boundary layer thicknesses[J]. Journal of Aerospace Power, 2023, 38（1）：184-196 doi: 10.13224/j.cnki.jasp.20220445
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The impacts of the cavity leakage flow on the shrouded stator aerodynamic performance were investigated by modelling of the annular cascade mainstream with the seal cavity flow path based on the validated numerical method. Meanwhile, the interactions between the cavity leakage and the mainstream were also determined in the current study. The developments of hub corner separation under the action of leakage were discussed, while the total pressure loss coefficient and the entropy-based loss coefficient were employed to evaluate the performance changes at different boundary layer thicknesses. The results showed that the thickening of the boundary layer increased the total pressure loss coefficient and the entropy-based loss coefficient of diffuser cascade without cavity. The cavity leakage flow induced a new vortex near the blade leading edge, and had effect on the development of passage vortex and the size of concentrated shedding vortex. At the same time, the leakage flow strengthened the three-dimensional flow effect in the cascade passage and weakened the cross-passage deflection of the fluid near end-wall. As the boundary layer thickened, the variations of total pressure loss coefficient and entropy increase loss coefficient of diffuser cascade with cavity were not obvious.
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