环境压力对高拱坝水垫塘水力特性的影响

On the differences of flow patterns and hydraulic characteristics in model tests under atmospheric and vacuum ambient

本研究在常压和减压不同的环境压力下，研究了水垫塘内水流的流态特征、入水射流对水垫塘底板的冲击压力和脉动压力强度以及拱坝下游坝面的紊流脉动压力强度的特性，给出了不同环境压力下动水冲击压力的沿程分布、脉动压力强度沿程分布以及空间相关曲线．由试验成果发现，减压使水垫塘内水流流态及水力要素均发生变化。

This paper deals with the flow characteristics in model tests of plunge pool for high arch dam under different ambient pressure,including the flow patterns,time average pressure and fluctuating pressure acting on the bottom floor and downstream face of the dam.The results show that the flow patterns and flow characteristics in plunge pool are changed with the reduction of ambient pressure in vacuum tank.