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| Effect of tip clearance on flow behaviors in a multiphase pump |
| SHI Guangtai，LIU Zongku，WANG Binxin |
| Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, Sichuan 610039, China; School of Energy and Power Engineering, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract To reveal the effect of the tip clearance on the flow behaviors in the pump, the ANSYS CFX software is employed to simulate the gas-liquid two-phase flow under different tip clearances at the inlet gas void fraction(IGVF)=10%. Meanwhile, the effect of the tip clearance on the flow behaviors is analyzed and summarized. Results show that with the increase of the tip clearance, the low-pressure region proportion at the impeller blade inlet decreases significantly, and the pressure difference between the impeller inlet and outlet gradually declines. In addition, the deflection of the pressure contour on the blade pressure side near the blade tip emerges, and with the increase of the tip clearance, the deflection phenomenon becomes more severe. In the presence of tip clearance, the gas accumulation at the impeller hub is significantly improved, and with the increase of the tip clearance, the gas accumulation near the blade tip in the tip clearance is more obvious, and the gas accumulation location at the diffuser hub moves downstream in the flow direction. The findings provide a basis for hydraulic optimization, performance improvement and structural design of the multiphase pumps.
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Received: 22 March 2022
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