非完全宽尾墩消能机理数值模拟  

Numerical simulation of energy dissipation mechanism at incomplete flaring gate pier

作　　者：董宗师 王均星[1] 蔡芳[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2016年第4期521-526,共6页Engineering Journal of Wuhan University

摘　　要：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 joint energy dissipation structure at low Froude number,which is combined with incomplete flaring pier,stilling basin and trapezoidal pier,the model experiment and numerical calculation method are adopted to study flood-releasing surface holes of Chushandian reservoirin in Henan province.The reliability of numerical simulation can be verified for that the water surface profiles after calculation are agreement with the experimental data.Through the comparative analysis of inner flow field between the stilling basin with flaring gate pier and flat gate pier,the energy dissipation mechanism enhanced by incomplete flaring gate pier can be concluded as follows.Incomplete flaring pier can enlarge the transverse diffusion space of water,so that the vertical shaft revolution and rolling of water at header of stilling basin can be enhanced.Meanwhile,the horizontal velocity gradient in stilling basin of flaring gate pier is larger than that in stilling basin of flat gate pier,which can produce violent turbulent shear and horizontal flow.Compared with stilling basin with flat gate pier,stilling basin with flaring gate pier can better control the flow velocity and state of water flowing out the basin;so that it can reduce the scour to downstream bank,That is what we should consider during design.

关 键 词：非完全宽尾墩 FLOW-3D 底流消能 弗劳德数 

分 类 号：TV131[水利工程—水力学及河流动力学]