超低弗劳德数闸下消能试验

Experiments on under sluice energy dissipation at ultra-low Froude number

低弗劳德数、低水头、低尾水的闸下消能消力池内不能产生稳定充分水跃,池内壅起的水流出池后会产生二次跌落,对下游河床冲刷严重。针对芦潮港水闸工程,通过物理模型试验提出了一种新型辅助消能工,即在池后海漫设置梅花形布置墩群,可使下泄水流达到充分消能、均匀扩散的效果,并分析了墩群的消能机理。实践表明,这种新型的消能布置方案可以有效地解决超低弗劳德数底流水跃消能不充分的问题,可供类似工程参考。

The under sluice energy dissipation at low Froude number, low water head, and low tailwater does not produce steady hydraulic jump in the stilling basin. The surge in the stilling basin drops again after water flows out, and it leads to serious erosion on the lower river bed. In combination with the sluice project at the Luchao Port, a new type of auxiliary energy dissipator was proposed by physical model tests, i.e. the setting of cinquefoil-shaped pier groups on the apron behind the stilling basin to obtain good effect in full energy dissipation and uniform diffusion of water discharge toward downstream, and the mechanism of energy dissipation by the pier groups was analyzed. Practice shows that the new type of energy dissipation layout scheme is effective to overcome insufficient energy dissipation of bottom flow by hydraulic jump at ultra-low Froude number.