淹没扩散出流不稳定现象研究

抽水蓄能电站上水库的进出水口,在抽水工况下,各个水平分流孔口的出流类似于矩形扩散管嘴的淹没出流。针对国内某一在建的抽水蓄能电站上库进出水口的模型试验;采用先进的量测手段,获得了大量进出水口拦污栅处的三维流速资料,发现出水口的水流流态是不稳定的,除随机的脉动外还存在不稳定的摆动:对各流速分量进行了频谱分析和相关性分析,得出各分量的摆动频率和脉动频率及其互相关系数。研究成果可作为进出水口拦污栅设计的参考。

Study on unstable phenomenon of submerged divergent outflow

For intakes/outlets in the upper reservoir of a pumped-storage power station,under pumping condition,the outflow from one horizontal outlet is similar to the submerged outflow from a rectangular divergent nozzle.In this paper,for a physical model of intakes/outlets in the upper reservoir of a pumped-storage power station,a vast amount of 3-D velocity data at outlets are obtained by an advanced measuring equipment.It is found that the flow pattern from the outlet is unstable and swings back and forth besides stochastic pulsation.The swing and pulsating frequency of the velocity components and their inter-correlative coefficients are gained by the frequency spectrum analysis and correlation analysis of velocity components.