Analysis of Pressure Fluctuation and Stress Deformation in Reverse Generation of Large Vertical Axial Flow Pump

In order to study the stability of the reverse generation of a pumping station in the eastern route of the South to North Water Transfer Project, a full numerical simulation of the flow passage was carried out to study the pressure fluctuation and the stress distribution law in the reverse generating condition. At the inlet of the guide blade, the monitoring points are set up in three sections of the inlet and outlet of the runner. The calculation results show that the pressure pulsation at the outlet of the wheel is the largest, the pressure pulsation between the guide vane and the wheel is the second, and the pressure pulsation at the inlet of the guide blade is the smallest. At the inlet and outlet of the impeller, the blade is dominated by the frequency. The flow state is uneven, and the pressure fluctuating from the hub to the rim gradually increases. The results of fluid solid coupling show that the stress mainly concentrates on the blade pressure surface and the root of the suction surface, and the maximum equivalent stress appears at the impeller root of the suction surface of the blade. The maximum equivalent stress value is in the safety range of the blade material, and does not affect the life and failure of the turbine running unit.