Vaned diffuser optimization of the submersible electric pump of the high specific speed

It is difficult to achieve a high efficiency in single-stage monoblock submersible electric pumps with a motor streamlined by the pumped liquid due to the configuration of the casing. To improve the energy qualities of such pump units, vaned diffusers of different construction were studied in order to select the best geometry for design of the flow passage. A two-stage parametric optimization of the vaned diffuser of the selected construction was performed as part of the flow passage with input parameters having the greatest impact on the hydraulic efficiency of the pump. Two methods of covering the search field by the calculation points were studied with determination for the location area of the global maximum of the objective function. A refinement search for the maximum hydraulic efficiency of the pump was carried out using direct methods of the numerical optimization. The flow structure in the casing of the pump with the original and optimized vaned diffuser was analyzed.
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