天生桥一级水电站溢洪道几个水力学问题研究

天生桥一级水电站溢洪道水头高,流速高,泄量大,泄洪功率大,高速水流问题较为突出.本文在模型试验的基础上,初步研究了该溢洪系统对泄流能力的制约和影响、明渠连接渐变段的体型选择、斜尾墩消除水冠、陡槽水流平面扩散角的选择、泄洪水流与河道斜交时的顶冲回流与消能防冲等水力学问题,并通过分析研究得出了一些有益的结论.

Study on Some hydraulic problems of the Spillway of the Tianshengqiao I

With high head and flow velocity, large discharge and flood discharge capacity, the prob-lems of high-velocity flow are signficant in Tianshengqiao I . This article, on the basis of model ex-periment, makes a preliminary study on some hydraulic issuses, such as the restriction by the spillway system on its discharging capacity, determination on the shape of converging section of an open chan-nel and the flow diverging angle in a steep slope channel, refracted flow at the oblique crossing be-tween the flood discharge flow and the river coures, scouring prevention and dissipation etc. Some helpful conclusions are drawn through analysis.