跌坎型底流消力池水力特性数值模拟研究

Numerical Simulation on the Hydraulics of Step-Down Hydraulic Jump Dissipater

采用数值模拟方法,以某实际工程为例,对跌坎型底流消力池水力特性进行了分析研究。研究结果表明,跌坎型消力池内水面平稳,波动较小;下泄主流入池后迅速下潜,坎下形成稳定横轴旋涡,上方形成巨大旋滚;跌坎型消力池底板临底流速分布均匀,变化梯度较小;除跌坎附近外,消力池底板时均压强分布均匀,压强梯度较小。

Taking a real project as an example, the numerical simulation method was used to study the hydraulics. The results show that thesurface is smooth in the stilling pool with smaller fluctuation. After the mainstream discharged into the stilling pool, there is a stabletransverse vortex under the step, and a huge roll above the mainstream. In the stilling pool, the bottom velocity distributes uniformly withsmaller gradient. Except the nearby area of the step, the pressure distributes uniformly also.