寒山水库岸边式溢洪道进水渠导墙体型优化试验研究

An Experimental Research on the Design Optimization of Guide Walls in the Bank Spillway of Hanshan Reservoir

进水渠作为溢洪道的重要组成部分,其内部水流流态对溢洪道泄流能力有重大影响。基于实际工程岸边式溢洪道模型,研究直线形、圆弧形、椭圆弧形导墙对进水渠内水流流态及闸室泄流能力影响,并通过改变导墙长短,分析导墙长度对其影响结果。试验结果表明:当岸边式进水渠临坝一侧未设置导墙时,靠近大坝闸孔内由于横流影响,出现剧烈旋滚现象,过流能力大大减小;在临坝一侧增设导墙后,由于横流消失,进闸水流流态有了较大改善,闸室泄流能力有不同程度提高,导墙长度越长对水流流态调整作用越明显;其中增设长短轴黄金分割比椭圆曲线导墙方案对进水渠水流流态的调整及溢洪道泄流能力提高最为明显。

Inlet channel is an important component spillway,the flow state in it has an importane influence on discharge capacity.Based on a bank spillway model of actual project,an experimental reserch on the discharge capacity effected by the type of guide wall,such as linear type,curve type and elliptic curve type,is proceeded.The results show that the guide wall close to the dam plays a very important role in the flood process.When the guide wall close to the dam is set,the flow state into the gate has been greatly improved,as well as the dischage capacity,because the lateral stream has disappeared.And the longer the guide wall,the better the flow state.Thereinto,an elliptic curve guide wall with golden section ratio of long and short axes can adjust flow state and improve the discharge capacity very obviously.