| 河道交汇区涡旋结构研究 |
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| 引用本文： | 林青炜,唐洪武,袁赛瑜,陈康,肖洋.河道交汇区涡旋结构研究[J].河海大学学报(自然科学版),2019,47(4):352-358. |
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| 作者姓名： | 林青炜 唐洪武 袁赛瑜 陈康 肖洋 |
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| 作者单位： | 河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学水利水电学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学水利水电学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学水利水电学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学水利水电学院,江苏 南京 210098;河海大学水文水资源与水利工程科学国家重点实验室,江苏 南京 210098;河海大学水利水电学院,江苏 南京 210098 |
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| 基金项目： | 江苏省研究生科研与实践创新计划(KYCX18_0599)；中央高校基本科研业务费专项(2018B629X14)；国家自然科学基金(51779080) |
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| 摘 要： | 利用粒子图像测速技术(PIV)实现了基于涡量的剪切层和分离区位置的精确确定,同时对汇流区水平面内的涡旋结构进行系统观测和分析。研究发现:剪切层和分离区近水面和近底面水深平面的涡旋密度大,水深中部的涡旋密度小;支流流量增大的情况下涡旋密度均增大。槽底壁面湍流是近底面涡旋密度大的主要原因。剪切层由水流剪切产生的剪切涡以小旋转强度涡旋为主,分离区由水流分离产生的分离涡以中等及小旋转强度涡旋为主。
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| 关 键 词： | 粒子图像测速技术 河道水流交汇区 剪切层 分离区 涡旋 涡量 旋转强度 水槽试验 |
Study on vortex structure at river confluence |
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| LIN Qingwei,TANG Hongwu,YUAN Saiyu,CHEN Kang and XIAO Yang.Study on vortex structure at river confluence[J].Journal of Hohai University (Natural Sciences ),2019,47(4):352-358. |
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| Authors: | LIN Qingwei TANG Hongwu YUAN Saiyu CHEN Kang and XIAO Yang |
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| Institution: | State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China,State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China and State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Particle image velocimetry(PIV)technique is used to accurately determine the location of shear layer and separation zone based on vorticity. Meanwhile, the vortices in the horizontal plane at the confluence are systematically observed and analyzed. It is found that the vortex density within both the shear layer and the separation zone is larger near the water surface and near the bottom than that in the middle of water depth. The vortex density increases with the increase of tributary discharge when the discharge of main channel is fixed. The high density of vortices near the bottom is caused by the wall turbulence. In addition, the shear layer generated by flow shear is dominated by vortices with small swirling strength, while the separation zone generated by the flow separation is dominated by vortices with medium and small swirling strength. |
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| Keywords: | particle image velocimetry river confluence shear layer separation zone vortex vorticity swirling strength flume experiment |
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