Influence of annular grooves with different geometric structures on high-speed inducer cavitation performance
In order to further explore ways to improve the cavitation performance of high-speed centri-fugal pumps used in aerospace,and to study the effect of annular groove geometry on the cavitation performance of high-speed inducer,three different geometric shapes of annular grooves,namely rectan-gular,single curvature and double curvature,were designed.The effectiveness of the numerical simu-lation method was verified by the hydraulic characteristics and cavitation performance test of the original model pump.The numerical simulation of different schemes were carried out to analyze the in-fluence of different geometric annular grooves on the cavitation performance,energy distribution in the flow channel and the inlet flow pattern of the inducer in the high-speed inducer centrifugal pump.The results show that setting the annular groove upstream of the high-speed inducer can reduce the neces-sary cavitation margin of the pump.Among them,the single-curvature groove can reduce the necessary cavitation margin of the centrifugal pump by 27.0%,and the double-curvature groove and the rectangu-lar groove reduce the necessary cavitation margin by 14.7%and 5.4%,respectively.The annular grooves can reduce the influence of the tip clearance backflow on the upstream mainstream,the turbu-lent kinetic energy distribution on the inducer blade is more uniform,and the pressure in the inducer channel is significantly improved.The transition of the back flow in the single-curvature groove is smoother and the suppression of the circumferential vortex is weaker.The rectangular groove and the double-curvature groove have a stronger ability to absorb the wall vortices,which can weaken the de-velopment and influence of the upstream asymmetric vortex to inducer channel.
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万方数据
维普
