增设前置尾坎下水库溢洪道水工模型试验研究  

Experimental Study on Hydraulic Model of Reservoir Spillway Under the Front Tail Still

作　　者：姚刚 YAO Gang(Xujiaya Reservoir Management Center,Feixian County,Linyi 273400,China)

机构地区：[1]费县许家崖水库管理中心,山东临沂273400

出　　处：《海河水利》2025年第4期91-95,共5页Haihe Water Resources

摘　　要：为研究大兴庄水库二期工程溢洪道增设前置尾坎下其体型设计对溢洪道泄流水力特性影响,设计开展了水工模型试验对比,基于试验结果进行了体型方案优化。试验结果表明,泄流量对流速水平变化趋势主导影响作用高于前置尾坎体型参数,但控制尾坎体型参数有助于抑制泄流段非稳定流体产生,可以减弱动水势能。前置尾坎体型参数大小会改变溢洪道断面上压强变化趋势,在尾坎边长5~9.5 mm时,尾坎体型无法有效覆盖阶梯淹没面,导致压强出现二次递减段;当尾坎边长增大时,压强水平并不是持续递减,而是在边长11 mm后递增。增大尾坎体型参数,消能池内紊动能减少,消能率也愈高,但消能率在边长11~15 mm时稳定在58%。结合模型试验结果,认为前置尾坎边长11 mm是最适宜方案。研究成果可对溢洪道前置尾坎设计优化及模型试验监测数据分析提供参考。To study the influence of shape design on the hydraulic characteristics of spillway discharge under the condition of adding a front tail sill in the spillway of the Daxingzhuang Reservoir Phase II Project,a hydraulic model test was designed and conducted.The shape scheme was optimized based on the test results.The test results indicated that the dominant influence of discharge on the horizontal variation trend of flow velocity was higher than that of the shape parameters of the front tail sill.However,controlling the shape parameters of the tail sill helped to suppress the generation of unstable fluid in the discharge section and weaken the hydrodynamic potential energy.The size of the shape parameters of the front tail sill affected the pressure change trend on the spillway section.When the side length of the tail sill was between 5 and 9.5 mm,the tail sill shape cannot effectively cover the stepped submerged surface,leading to a secondary decrease in pressure.As the side length of the tail sill increased,the pressure level did not decrease continuously but increased after reaching 11 mm.With an increase in the shape parameters of the tail sill,the turbulent kinetic energy in the energy dissipation pool decreased while the energy dissipation rate increased.However,when the side length was between 11 and 15 mm,the energy dissipation rate stabilized at 58%.Based on the model test results,it was concluded that a side length of 11 mm for the front tail sill was the optimal solution.The research findings can provide references for the design optimization of the front tail sill of spillways and the analysis of model test monitoring data.

关 键 词：大兴庄水库 溢洪道 前置尾坎 模型试验 

分 类 号：TV651.1[水利工程—水利水电工程] TV131.61