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Effect of blade gap drainage on the performance of high-speed inducer |
CHENG Xiaorui1,2*, LI Min1,LI Tianpeng1 |
1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and System of Gansu Province, Lanzhou, Gansu 730050, China |
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Abstract To study the effect of blade gap drainage on the performance of high-speed inducer, a high-speed centrifugal pump with a front inducer was selected, and the internal flow field of the high-speed centrifugal pump with five different gaps in the inducer blades was numerically simulated, and the effect of the inducer blades drainage on itself and the cavitation performance on high-speed centrifugal pump was studied. After slitting, the velocity distribution in the section of the inducer, the characteristic curve outside the inducer, the cavitation characteristic curve of the high-speed centrifugal pump, the cavitation distribution in the inducer flow channel, and the static pressure distribution law of each section of the inducer along the axial position were compared and analyzed.The results show that setting gaps on the blade surface can weaken the impact of the leakage flow of the inducer tip clearance on the pipe wall, weaken the vortex near the suction surface of the blade inlet, and improve the flow pattern in this area. The gap can change the distribution of the pressure in the inducer passage, thereby affec-ting the distribution of the bubbles in the inducer passage, and a reasonable design of the size of the gap can improve the cavitation performance of the high-speed centrifugal pump.
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Received: 13 October 2020
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