Hydraulic optimisation design of axial flow pump based on blade velocity distribution

Due to the large flow and high channel flow velocity, the control of flow of the axial flow pump is more difficult, compared with centrifugal water pump. The improvement of problems induced by pressure fluctuation and noise are much more challenging. A numerical simulation of the hydraulic characteristics of a high specific speed axial flow water pump is carried out, and the reliability of the numerical model is verified through model test. The influence of the impeller geometric change on the performance of the pump was discussed, by means of parametric design and compute with the pressure fluctuation as design objectives. Hydraulic characteristics were compared between the initial and optimised impeller. The numerical simulation results show that by controlling the flow velocity in the impeller channel to a symmetrical distribution, the stability of the internal flow of the water pump can be enhanced, and the hydraulic vibration of the water pump can be reduced, as well as the fluid-induced noise.