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.
作者
葛新峰
孙洁
吴丹
祝双桔
张雷
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)
出处
《水电能源科学》
北大核心
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)。
关键词
VOF多相流
排水渠
台坎
消能
数值模拟
VOF multiphase flow
drainage channel
platform
energy dissipation
numerical simulation
