下环间隙对混流式水轮机转轮进口的影响

The Influence on Inlet of Runner of Francis Hydraulic Turbine by the Clearance of Low Ring

为分析混流式水轮机下环间隙对水轮机稳定性的影响,通过对含下环间隙的凤滩电站原型水轮机进行三维全流道数值计算,分析了下环间隙对水轮机转轮进口压力机速度的影响,得出了不同密封间隙值下间隙内部压力的变化规律。为水轮机组在设计和运行时避免振动提供了一定的参考依据。

In order to analyze the influence on stability on francis hydraulic turbine by the clearance of low ring, the three- dimensional turbulent flow is simulated through the whole flow passage of hydraulic turbine of a plant including the clearance of low ring. This paper analyzes the influence on inlet of runner pressure and velocity, obtaining the pressure change law in law ring clearance at different clearance value. Also providing a reference basis when Hydraulic Turbine is designed and in operation to avert librating.