收缩墩与跌坎消力池水力特性的试验研究

为探究解决跌坎型消力池在大单宽、低弗劳德数条件下引起的振荡型水跃问题,进行了跌坎型消力池和收缩墩与跌坎型消力池两类消能工试验,对比分析了试验的流态、流速和压强分布规律。试验结果表明,加设收缩墩后,入池射流破坏了表面水流与水垫层剪切形成的大幅度振荡波动,有效地解决了振荡型水跃问题,降低了水流对底板的冲击压力。

Experimental study on hydraulic characteristics of stilling pool with contraction pier and falling sill

In order to explore how to solve the problem from the oscillating hydraulic jump caused by the stilling pool with falling sill under the condition of large unit width and low Froude number，the experiments on two kinds of energy dissipators，i.e. stilling pool with falling sill and stilling pool with contraction pier and falling sill，are carried out，from which the flow pattern，flow rate and the pressure distribution law are comparatively analyzed. The experiment results show that the large amplitude oscillating wave formed by the shearing between the surface flow and the water cushion layer is broken up by the inflow jet after adding the contraction pier，thus not only the problem from the oscillating hydraulic jump is effectively solved，but the impacting pressure from water flow on the bottom floor is also lowered.