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| Optimal design of geometric parameters of diffuser inlet under optimal working conditions |
| LIU Zailun1,2*, WANG Sanzhen1, ZHANG Jingmin1, WANG Jinxuan1 |
| 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou, Gansu 730050, China |
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Abstract Through the determination of the best operating point of the well-used submersible pump, the characteristic equation of thediffuser under the optimal working condition is obtained, and the analysis shows that there is a certain relationship between the geometric parameters of the inlet of the diffu-ser(the angle and width of the inlet). In order to verify the relationship between the geometric parameters of the diffuser inlet, select 200QJ50 two-stage well submersible pump as the research object, using the method of combining numerical simulation and experiment. Under the combined changes of the diffuser inlet angle and inlet width, 16 sets of submersible pump models was established to study the performance change law and internal flow field of well submersible pumps. The results show that when the geometric parameters of the inlet of the guide blade are selected in accordance with the characteristic equation of the diffuser under the optimal working conditions, the hydraulic loss of the diffuser can be reduced and the pump performance can be improved. Comparing the inlet placement angle obtained by bringing the given inlet width into the characteristic equation of the diffuser under the optimal working condition and the corresponding simulated optimal angle under the inlet width, both difference between within 1°, it shows that using the characteristic equation of the diffuser under the optimal working conditions to select the geometric parameters of the diffuser inlet has certain accuracy, which provides a reference for the optimal design of the diffuser.
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Received: 17 September 2020
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