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为研究一种联合消能结构——非完全宽尾墩、消力池和梯形墩相结合的结构在低Fr数下的消能机理,采用模型试验和数值模拟方法对河南省出山店水库泄洪表孔进行研究.数值计算所得水面线与模型试验所测结果吻合良好,说明数值模拟的可靠性.通过对宽尾墩和平尾墩消力池内部流场的对比分析,得到非完全宽尾墩提高消能效果的机理:非完全宽尾墩能使水流横向扩散的空间增大,增强消力池首部水流的立轴旋滚;消力池内存在较大的横向速度梯度,产生剧烈的紊流剪切和横向流动.相对于平尾墩消力池,宽尾墩消力池能较好地控制出池水流的流速及流态,减少下游河岸冲刷,在设计时可以予以参考.
In order to study the energy dissipation mechanism of a combination of dissipative structures - incomplete flaring piers, troughs and trapezium piers with low Fr numbers, model tests and numerical simulations were carried out to flood discharge at Chunshandian Reservoir in Henan Province The results of numerical simulation agree well with the results of the model test, indicating the reliability of the numerical simulation.By comparing the flow field inside the tapping piers and the flat-tailed piers, we can obtain the incomplete tail piers The mechanism of improving the energy dissipation effect: The incomplete flaring pier can increase the lateral diffusion of water flow and increase the vertical rotation of the head stream of the stilling pool. There is a large lateral velocity gradient in the stilling pool, resulting in severe turbulent shear Cut and transverse flow.Compared with the flat-tail pier stilling pool, the wide-tail pier stilling pool can better control the flow rate and flow pattern of the pool water and reduce the downstream riverbank erosion, which can be referred to in the design.