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| Effect of impeller outlet edge inclination on performance of deep well centrifugal pump |
| Cong Xiaoqing1, Yang Ming1, Lu Weigang2, Chen Guannan1 |
| 1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Since a deep well multistage centrifugal pump has to work in a well, its impeller diameter and maximum discharge are restricted by the borehole diameter. In order to improve the pump hydraulic efficiency, its single-stage head must be the highest. In doing so, the sloping angle of the impeller outlet edge of 100QJ10 deep well multistage centrifugal pump was designed to be 10°, 15°, 20°, 25° and 30°, respectively. Then the steady, three-dimensional, incompressible turbulent flows of water in one stage of the pump were simulated based on the RANS equations and standard turbulence model by using a CFD code. The performance, turbulent kinetic energy, velocity and pressure fields were compared among the different impeller structures at the same discharge for an optimal sloping angle to be explored. The results show that the hydraulic efficiency and single stage head are maximum at two di-fferent sloping angles; this means the angle for the highest head is lower than that for the best efficiency. For a compromise, the optimal sloping angle should be 20°. Further, the predicted performance is in good agreement with the tested one. It was confirmed that the best overall efficiency of the pump redesigned with the impeller of 20° outlet edge sloping angle is as high as 58.9%, a 5.9% increment has been achieved compared with the original pumps.
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Received: 24 December 2012
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