Influence on performance of submersible well pump changing clearance of wear-rings
Shi Weidong1, Gao Xiongfa1, Zhang Desheng1, Lu Weigang1, Zhang Qihua1, Zhang Xiao2
1.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Hubei Heqiang Machinery Development Co., Ltd., Ezhou, Hubei 436004, China
Abstract：The whole flow field of the submersible well pump 200QJ80-22 was numerically simulated with CFD. By comparing the calculation results with experimental results, the influence of clearance of wear-rings on the external characteristic and internal flow field was analyzed. The results of the nume-rical simulation shows that the head and efficiency of the pump decrease as the size of clearance increases. Especially, when the size of clearance reaches 0.7 mm, the decreasing becomes very obvious yet the pump power almost remains constant; when the size of the clearance reaches 1.00 mm, the efficiency decreases from the highest point of 77.2% to 68.7%, and the head of pump decreases by about 3.5 m; when the size of clearance is 0.2 mm, reverse-flow will appear in the front shroud cavity of the first stage impeller and second stage impeller and in the area between the impeller outlet and the front shroud, which has a small influence on the flow of the impeller inlet and flow field, because there is little leakage flow; reverse-flow gradually disappears when the size of clearance increases to 0.5 mm, but more leakage flow could impact on the impeller inlet, which results in the area of passage of impeller inlet decreasing, and thus seriously affecting the hydraulic performance of the pump.
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