Research on the influence of intra-cavity impeller on the performance of compressor stator vane

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Journal of Dalian Maritime University ›› 2025, Vol. 51 ›› Issue (4) : 80-91.

KONG Xiaozhi^*¹, CAO Xinyu², RUAN Chuanyong¹

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Abstract

A three-dimensional numerical simulation was carried out on a diffuser cascade with a cavity structure, and improvements were made to the cavity by adding a rotor inside and varying its position and size. Comparative analysis was conducted on the flow field structures and performance parameters of different improved schemes. The results show that the modified cavity structures can reduce the overall total pressure loss coefficient and entropy generation loss coefficient of the cascade. When the rotor is placed near the leakage outlet cavity, the total pressure loss coefficient decreases by 16.4% compared to the original configuration, although the reduction in entropy generation loss coefficient is not significant. When the rotor is located near the leakage inlet cavity, the total pressure loss coefficient decreases by 12.0%, and the overall entropy generation loss is reduced, with the entropy generation loss coefficient decreasing by 13.0% compared to the prototype. After the leakage flow gains energy from the rotor within the cavity, its circumferential velocity increases. Upon mixing with the mainstream, the strengthened resistance to crosswise secondary flows improves the flow in the cascade passage. The migration of low-energy fluid along the spanwise direction near the endwall is reduced, the spanwise extent of corner separation is diminished, and the aerodynamic performance of the stator blades is enhanced.

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diffuser cascade / stator cavity / cavity optimization

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KONG Xiaozhi, CAO Xinyu, RUAN Chuanyong. Research on the influence of intra-cavity impeller on the performance of compressor stator vane[J]. Journal of Dalian Maritime University. 2025, 51(4): 80-91

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