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
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.
史广泰，刘宗库，王彬鑫. 叶顶间隙对多相混输泵内流动特性的影响[J]. 排灌机械工程学报, 2022, 40(4): 332-337.
SHI Guangtai，LIU Zongku，WANG Binxin. Effect of tip clearance on flow behaviors in a multiphase pump. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(4): 332-337.
