Numerical simulation of flow characteristics and performance prediction of a motor-pump

In order to study the performance of the full-flow pump (motor-pump),we used the CFD software to simulate the three-dimensional flow of the motor-pump model system,and analyzed the internal flow state and overall performance of the motor-pump.The results showed that in all working conditions,the front guide vane inlet flow rate uniformity of the motor-pump is above 97%,and the uniformity of the impeller inlet flow rate is above 91%.The uniformity is enough to ensure pump performance.The hydraulic loss of the inlet flare tube and the front guide vane is low,while that of the back guide vane and the outlet flare tube is relatively high.The outlet velocity of the outlet flare tube is unevenly distributed with a poor flow state.The maximum efficiency of the system is 69.47%,and the head is 4.855 m when the flow rate is 290 L/s.In all working conditions,the head of the motor-pump system is smaller than the head of the contrasting axial-flow pump system,and the former′s efficiency is lower than the latter′s.The shaft power consumed by the motor-pump system is more than that consumed by the contrasting axial-flow pump system.The motor-pump has short pipelines,large outlet flow velocity,insufficient diffusion,and large hydraulic loss.These are the main reasons why the motor-pump system has low efficiency.

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