消力池尾坎体型对水跃特性的影响

底流消能是水利工程中常见的消能方式之一.本研究以斜坡+竖直坎的消力池尾坎组合为研究对象,设计出9种消力池尾坎体型(不同坡度、不同竖直坎长度),研究尾坎体型对消力池内水跃特性的影响.通过数值模拟,获得了设计工况下各个体型的水面线、消能率、水跃长度、临低流速和尾坎压强分布特性.通过对比分析发现,竖直尾坎的长度直接影响水面线、消能率等水力特性.研究结果表明,通过数值模拟可以提高研究效率,并为实际工程的消力池设计提供重要的参考依据.

The influence of the shape of the end sill in the stilling basin on characteristics of water jump

In current hydraulic projects, energy dissipation by hydraulic jump is one of the most common energy dissipation methods. This study uses the combination of slope and stilling basin with vertical sill as research subject. We have designed nine kinds of shape of the stilling basin''s end sill (different slopes'' slope, different height of vertical sill), and studied how the shape of the end sill influence the water jump''s performance inside the stilling basin. Via numerical simulation, the hydraulic characteristics such as water surface line, energy dissipation, water jump length of each shape, bottom velocity and pressure of end sill under the design condition are obtained. Via comparing and analysizing the results, it is found that the length of the straight part of the sill influences water line and the energy dissipation. The result shows that using numerical simulation can be applied to provide vital references for the design of the stilling basin in engineering problems while improving the efficiency.