基于VOF模型的排水渠道流动数值模拟及消能措施优化研究  

Study on Numerical Simulation of Drainage Channel Flow and Optimization of Energy Dissipation Measures Based on VOF Model

作　　者：葛新峰[1] 孙洁[1] 吴丹 祝双桔 张雷[2] 胡正凯 徐挺 唐嘉昊 GE Xin-feng;SUN Jie;WU Dan;ZHU Shuang-ju;ZHANG Lei;HU Zheng-kai;XU Ting;TANG Jia-hao(College of Energy and Electricity,Hohai University,Nanjing 210098,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China;Chongqing Shipping Construction Development Co.,Ltd.,Chongqing 500000,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]河海大学能源与电气学院,江苏南京210098 [2]黄河水利科学研究院,河南郑州450003 [3]重庆航运建设发展有限公司,重庆500000 [4]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《水电能源科学》2021年第5期109-112,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51579080);中央高校基本科研业务费项目(2015B02814);河海大学创新创训项目(201910294032Z)。

摘　　要：为改善某电站雨水排水渠道的水流流态,减轻对下流排水渠道的冲蚀作用,建立了全三维排水渠模型,模型包含上下游缓坡和中部台阶消能排水渠。采用VOF多相流模型进行非定常流动分析,原设计在缓陡坡连接处出现偏流、溢出现象,这主要是受到离心力和缓坡出流流速较大的惯性力的影响。对此,提出在上游缓坡增加多级台坎的措施来减缓缓陡坡连接处的流速,并优化台坎级数。通过分析改进模型流态和消能率,发现选择四级台坎时,排水渠道的整体流态和消能效果最好,上游排水渠出口最大流速比原设计下降27%,平均流速比原设计下降40%。研究成果可为类似工程提供参考。In order to improve the flow pattern of rainwater drainage channel of a power station and reduce the erosive effect on the downstream drainage channel,a full three-dimensional drainage channel model was established.The model included the upper and lower gentle slope drainage channel and the middle step energy dissipation drainage channel.The VOF multiphase flow model was used to analyze unsteady flow.In the original design,there appeared deflection and overflow at the junction of gentle and steep slope,which were mainly affected by centrifugal force and inertia force with the high flow velocity of gentle slope.In order to reduce the velocity at the junction,a measure of adding multi-stage platforms on the upstream was proposed.By analyzing the flow pattern and the energy dissipation rate of the improved model,it was found that the flow pattern and energy dissipation effect of the drainage channel is the best when the four-level platforms are selected.Compared with the original design,the maximum flow velocity at the outlet of the upstream drainage channel is reduced by 27%,and the average flow velocity is reduced by 40%.The study results can provide reference for the similar projects.

关 键 词：VOF多相流 排水渠 台坎 消能 数值模拟 

分 类 号：TV135.2[水利工程—水力学及河流动力学]