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Three groups of schemes were designed for different blade inlet angles of impellers to improve the efficiency and single-stage head of submersible well pumps. Furthermore, the hydraulic performance of the pumps was analysed using ANSYS CFX. As a result, the heads and efficiencies of the schemes were acquired. The internal flow fields of the schemes under different flow quantities were analysed, and the accuracy of the optimal scheme was experimentally verified. Results indicated that enlarging the inlet angle of the blade of submersible well pumps might improve the hydraulic performance to a certain degree. In comparison with the general design scheme with a fixed inlet angle that with an inlet angle was 26° at the front cover plate and 20° at the rear cover plate, and that in the middle was under uniform change. The incoming flow angle of the medium coincided with the inlet angle; thus, the discharge capacity of the pump had a high matching ratio with the actual discharge capacity. The head and efficiency improved remarkably relative to the initial model, and thus, the hydraulic performance of the pump improved. (Received in November 2019, accepted in March 2020. This paper was with the authors 2 months for 1 revision.)

Modelling the Influence of Inlet Angle Change on the Performance of Submersible Well Pumps