Research on the Solution to the Problem of Pressure Fluctuation Steep Increase in High Load Area of Francis Turbine
In recent years,there have been successive occurrences of sharp increases in pressure pulsation in the high-load region of large-capacity mixed-flow turbines,leading to excessive vibration of the unit's top cover and inability to achieve the designed output,which seriously affects the safety and economic operation of hydropower stations.This paper analyzes the reasons for the sharp increase in pressure pulsation in the high-load region and proposes a solution.Through CFD calculations and runner model tests,it is verified that the modification of the runner outlet blades can improve the pressure pulsation in the high-load region of the turbine.After implementing this method on the prototype of the Nuozhadu hydropower station,the pressure pulsation at the inlet of the tail water in the high-load region and the vertical vibration of the top cover are significantly reduced,providing a reference for solving the problem of sharp increase in pressure pulsation in the high-load region of mixed-flow turbines.
high loadpressure pulsationtop cover vibrationCFD calculationmodel testingrunner repair
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