Entropy generation diagnosis and hydraulic performance optimization of internal flow of two-stage submersible pumps for geothermal wells
In order to improve the operational efficiency of the submersible pump for geothermal wells,hydraulic design of the flow components of the two-stage submersible pump was completed based on the flow parameters and actual operating conditions of the submersible pump.The designed two-stage submersible pump was subjected to full channel flow numerical simulation and experimental verification;The high energy consumption area of the flow field in the submersible pump is mainly concentrated in the intersection of the stages and the interference of dynamic and dynamic components by using the entropy production analysis method.Orthogonal design and sensitivity analysis of structural parameters were used to determine the influence rules of structural parameters on the performance of the submersion pump.With exit blade angle of impeller,exit blade width of impeller,wrap angle of blade of impeller and guide vane axial length as optimization variables,and with head and efficiency as optimization objectives,the hydraulic optimization of the two-stage submersible pump structure was carried out by using genetic algorithm,optimal Latin hypercube sampling and entropy weight TOPSIS method.The results show that under rated working conditions,the optimized pump head increases by 24.9%,the efficiency increases by 5.7%,the total hydraulic loss is reduced by 1 024.9 W,the high energy consumption area is significantly reduced,and the hydraulic performance is significantly improved.The adverse flow phenomena such as separation flow,secondary flow,and impact flow are significantly suppressed.The handling capacity under high flow conditions is greatly improved,with the efficient operating range expanded by 70%.The operation stability is significantly enhanced.The research can provide theoretical guidance for the design of submersible pumps and the study of internal flow fields.
submersible pumps for geothermal wellsdiagnosis of entropy production analysisenergy losshydraulic optimization
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