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| A study on the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump |
| YUAN Jianping1,HOU Jingsheng1,FU Yanxia2,HU Jiwei2,ZHANG Haoyang2,SHEN Chendong3 |
1.National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China；
2.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;
3.Changzhou Industrial Technology Research Institute of Zhejiang University, Changzhou 213022, China
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Abstract In order to analyze the unsteady characteristics of the backflow vortex cavitation in a centrifugal pump, the standard k-ε turbulence model coupled with the homogenous cavitation model based on the simplified Rayleigh-Plesset equation were applied to simulate the unsteady inner flow in a centrifugal pump named IS65-50-160 at the low flow rate of 0.4Qd (40% of the design flow rate) through ANSYS CFX 14.5.The developing process of the backflow vortex cavitation as well as the pressure fluctuation at the blade leading edge were obtained and compared with experimental results.The phase-crossing analysis of the monitoring points of pressure pulsation at the blade leading edge was also carried out.The results show that at the low flow rate of 0.4Qd and as the cavitation number σ is the value of σ=0.056, the patterns of the developing backflow vortex cavitation involving basically three rotating components near the blade leading edge in the whole process will change with the blade rotating.There is no rotating component near the impeller eye.The propagation speed ratios of the three rotating components were 0.35, 0.66 and 1.95, respectively.
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Received: 09 March 2017
Published: 15 August 2018
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