In order to analyze the structural problems of an axial pump impeller at unstable operation saddle zone and to study the stability of the structure, numerical simulation was applied to solve the Reynolds-averaged Navier-Stokes equation by the finite volume method, and standard k-ε turbulence model was chosen in computation fluid dynamics software Fluent. The flow field and pump casing were calculated by one way fluid-solid coupling method in ANSYS Workbench, and stress distribution and total deformation distribution of the pump casing at different operating conditions were obtained and studied. The results show that an unsteady operation zone exits between 40% and 75% rated flow rate. The numerical simulation could accurately depict the flow field of the axial pump, and the unstable flow pattern of the pump device is gradually aggravating with the decreasing of flow rate. The stress of blade is markedly uneven and stress concentration occurs at the blade root, and with decreasing of flow rate, the maximum equivalent stress increases gradually, while the impeller structure satisfies the safety requirements. The maximum deformation occurs at the tip of blade inlet, and with the decrease of flow rate it increases and then decreases, while large deformation zone continues to expand. The research could provide reference for the safety and stable operation of axial flow pumps.
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