宽尾墩-跌坎底流消能工试验研究

Experimental research on bottom-flow energy dissipater of flaring gate pier and drop sill

针对某水电工程泄洪量大、单宽流量大、佛氏数低且河床易冲刷的特点,采用水工模型试验的方法对底流消能工、宽尾墩底流消能工、跌坎底流消能工及宽尾墩-跌坎底流消能工4个方案的消能效果进行了对比研究。结果表明,宽尾墩-跌坎底流消能工方案在典型工况下消能充分,出池水流衔接平顺,对下游河床冲刷较轻。详细介绍了4个消能方案的布置形式和试验过程,可为同类工程参考。

In light of a hydropower station that is characterized by large flood and unit-width discharges,small Froude number and easily scoured of river bed,4 energy dissipation schemes of bottom flow energy dissipater,bottom-flow energy dissipater of flaring gate pier,bottom-flow energy dissipater of drop sill and bottom-flow energy dissipater of flaring gate pier and drop sill are designed and their energy dissipation effectiveness are compared and researched by hydraulic model test.The test results show that under typical operation condition,for the bottom flow energy dissipater of flaring gate pier and drop sill,the effectiveness is the most obvious,the scouring to the downstream river channel is lighter and the transition flow at outlet is smooth.It gives a detail presentation to the layout and test process of 4 schemes,which can be referred for similar projects.