宽尾墩-跌坎型底流联合消能工水力特性试验研究

Experiment Study of Energy Dissipation of Flaring Pier-Falling Still Bottom-flow Plunge Pool

通过水工模型试验着重分析比较了宽尾墩-跌坎联合消能工与跌坎以及常规消能工消力池内的水流流态、临底流速以及脉动压力等,并根据试验结果拟合分析了该联合消能工的强迫水跃长度公式。试验结果表明,该种新型的消能方式改善了跌坎消力池内的水流流态,降低了消力池内的临底流速和脉动压力,缩短了消力池的长度,减轻了下游河道的冲刷,并且能很好地利用宽尾墩良好的消能率,克服宽尾墩挑射水流对消力池底板的冲击问题,为类似工程提供了参考,同时也丰富了泄洪消能工的型式。

The hydraulic model tests were performed to analyze and compare the flow patterns, bottom velocities, and fluctua- ting pressures in the flaring pier-falling still plunge pool and general falling-still plunge pool. The results showed that the new type of the energy dissipation can improve the flow pattern in the falling-still plunge pool, decrease the bottom velocity and the fluctuating pressure in the plunge pool, lower the length of plunge pool, alleviate the washout of downstream riverbed, and uti- lize the good energy dissipation rate of flaring pier to overcome the impact questions of jet flow of the flaring pier to the bottom surface of plunge pool. The new energy dissipation type can provide references for similar projects and enrich the types of flood discharge and energy dissipation.