深筒式消力井水力特性试验研究

Experimental research on hydraulics characteristics of energy dissipation in vertical stilling well

结合一个深筒式消力井工程的水力学模型试验 ,说明在高水头、小流量条件下 ,当水流从管道水流转换为明渠水流时 ,深筒式消力井是一种合理、可行的消能措施。深筒式消力井能承受输水管道很高的水头 ,与消力井进水管上安装有控制阀门密切相关。结合理论分析说明 ,输水管道的压力水头大部分耗散或损失在阀门处 ,阀门是消力井工程的关键部位 ,其开度应随压力水头的变化而变化 ;试验表明消力井出水管出口处的流速呈外弯大、内弯小的流速分布。

A hydraulic model experiment about the project of energy dissipation with vertical stilling well indicated that the vertical stilling well is a reasonable and feasible measure when the flow changes from the conduit to the open flow under the high head and small discharge conditions The vertical stilling well can bear much high head of the conveyer conduit, which is relative to the control valve installed on the import conduit The analysis of theory indicated that the greater part of the pressure head of conveyer conduit is consumed on the valve The valve is a key place on the project of energy dissipation well The opening of valve should adapt to the pressure head The velocity distributions in the expert conduit of energy dissipation well are large on the external curve,and are small on the internal curve