大河沿水库溢洪道增设掺气坎模型试验研究  

Model Test Study on Adding Aeration Bucket to the Spillway of Daheyan Reservoir

作　　者：孙海瑞 SUN Hai-rui(Xinjiang Yunfeng Water Conservancy Design Consulting Co.,Ltd.,Urumqi 830002,China)

机构地区：[1]新疆云沣水利设计咨询有限公司,新疆乌鲁木齐830002

出　　处：《海河水利》2023年第4期86-89,共4页Haihe Water Resources

摘　　要：为研究大河沿水库溢洪道增设前置掺气坎下设计方案对溢洪道沿程断面水力参数及消力池渗流场影响,采用水力模型试验方法,分析了不同坎阶高度方案下溢洪道沿程空腔、压强特征与池内流速变化。研究表明,坎阶高度与空腔分布长度具有正相关,但过大的坎阶高度不利于空腔稳定。以坎阶高度1.2m为界,时均压强分别具有“先增后减”与“先增后减再二次递增”的特征,坎阶高度1.4~1.6m时沿程下游出流段时均压强的递增易导致入池势能过大。坎阶高度与池内流速为负相关,但坎阶高度超过1.2m后,池内具有流速二次递增段,峰值流速靠近出池口,消能降冲效果较弱。综合试验结果,认为坎阶高度设计1.2m更为有利。本研究可为水库溢洪道掺气坎结构设计优化及模型试验分析提供参考。In order to study the influence of the design scheme of adding front aerator to the spillway of Daheyan Reservoir on the hydraulic parameters along the spillway section and the seepage field of the stilling pool,the hydraulic model test method was used to analyze cavity,pressure characteristics and pool flow velocity changes along the spillwayunder the schemes of different bucket step heights.The research shows that there is a positive correlation between ridge height and cavity distribution length,but too large ridge height is not conducive to cavity stability.Taking the bucket step height 1.2 m as the boundary,the time average pressure has the characteristics of"first increase and then decrease"and"first increase and then decrease and then increase again"respectively.When the bucket step height is 1.4~1.6 m,the increase of the time average pressure along the downstream outflow section is likely to lead to excessive potential energy into the pool.The height of the bucket step is negatively correlated with the flow velocity in the pool.However,when the height of the bucket step exceeds 1.2m,there is a secondary increase section of the flow velocity in the pool.The peak flow velocity is close to the outlet of the pool,and the effect of energy dissipation and scour reduction is weak.Based on the test results,it is considered that 1.2m is more favorable for the design of bucket height.The paper can provide reference for the structural design optimization and model test analysis of reservoir spillway aerator.

关 键 词：大河沿水库 溢洪道 模型试验 掺气坎 

分 类 号：TV651.1[水利工程—水利水电工程] TV131.61