设有掺气分流墩的溢流表孔优化试验  

Optimizing Experiments of Spillway Surface Orifice with Aeration Splitter Pier

作　　者：陈文辉 南军虎[2] 陈晴[3] CHEN Wen-hui;NAN Jun-hu;CHEN Qing(Gansu Water Resources and Hydropower Survey Design Institute Company with Limited Liability,Lanzhou 730000,China;School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Beijing Water Conservancy and Electric Power Engineering Co.,Ltd.of State Power,Beijing 100024,China)

机构地区：[1]甘肃省水利水电勘测设计研究院有限责任公司,兰州730000 [2]兰州理工大学能源与动力工程学院,兰州730050 [3]北京国电水利水电工程有限公司,北京100024

出　　处：《中国农村水利水电》2019年第5期155-158,164,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(51509123)

摘　　要：针对高山峡谷地区建坝存在单宽流量大、消能范围小、布置困难等问题,结合亚碧罗水电站中的4个高低位溢流表孔,采用模型试验研究的方法,对建筑物的出口段挑流型式进行了整体优化,并对设有掺气分流墩的低位溢流表孔进行了试验。结果表明,高位表孔和低位表孔分别采用窄缝挑坎和掺气分流墩有效解决了消能区域集中的问题;低位表孔出口的四面体优化墩可保持挑射水流的连续且横向扩散充分;溢流表孔直线段设置的掺气设施运行良好;反弧段压力变化符合自由表面凹曲面上水流的压力分布规律,脉动压强的优势频率在0.033～0.201 Hz之间变化;反弧段局部部位的最小水流空化数为0.15,应从施工不平整度和运行方面加以控制。For the dam construction in the high mountain gorge area, there are problems of layout difficulty, big unit discharge and small energy dissipation. Taking the hydropower station with 4 high and low spillway surface orifices as an example, the overall optimization of the flow pattern at the outlet section of the building and the hydraulic characteristics of the spillway surface orifice are carried out by the model tests. The results show that the problem of concentration of energy dissipation area is solved effectively by adopting narrow slot cantilever and aerated shunt pier respectively. The tetrahedron optimization pier at the outlet of the low surface outlet can maintain the continuous and horizontal diffusion of the jet flow. The air entraining facilities installed at the straight-line section of the overflow spillway is running well. The flip bucket pressure distribution is consistent with the pressure distribution on the free surface concave surface. The dominant frequency of fluctuating pressure varies from 0.033 to 0.201 Hz. The minimum number of cavitation in the reverse arc is 0.15. Therefore, it needs to be controlled in terms of construction irregularity and operation.

关 键 词：亚碧罗水电站 表孔 掺气分流墩 模型试验 水流空化数 

分 类 号：TV135.2[水利工程—水力学及河流动力学]