Influence of Wicket Gate Closure Law of Water Turbine and Initial Wicket Gate Opening on Maximum Dynamic Pressure in Spiral Case

Based on the well-known knowledge about the influence of wicket gate linear closure law on the maximum dynamic pressure in the spiral case during transient process at hydropower station, the effect of different sectionalized linear closure laws of water turbine guide vane on dynamic pressure of spiral case has been discussed with numerical calculation. Some laws between the magnitude of dynamic pressure of spiral case and the initial wicket gate opening are obtained.The follwing phenomenon is disclosed, such as the peak hydrodynamic pressure in spiral case occurs at the moment when discharge changes the most.