| 丁坝回流区水流紊动强度试验 |
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| 引用本文： | 陈稚聪,黑鹏飞,丁翔.丁坝回流区水流紊动强度试验[J].清华大学学报(自然科学版),2008(12). |
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| 作者姓名： | 陈稚聪 黑鹏飞 丁翔 |
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| 作者单位： | 清华大学水利水电工程系; |
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| 基金项目： | 国家“十一五”规划科技支撑项目(2006BAB05B02) |
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| 摘 要： | 丁坝是一种河道整治及护岸工程的设施。为研究丁坝回流区水流的脉动特性和冲刷机理,对玻璃水槽内丁坝回流区水流进行了测量。用三维激光颗粒动态分析仪(3D-PDA)测量三维脉动流速。分析了丁坝后3个流区(主流区、回流正流速区和回流负流速区)的紊动强度。结果表明:丁坝后回流区纵向紊动强度明显增强,且回流正流区大于回流负流区。主流区、回流正流速区和回流负流速区的3个流区纵向紊动强度均以对数形式沿程减弱,至回流结束一段距离后恢复到无丁坝状态。
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| 关 键 词： | 丁坝 水槽试验 回流 紊动强度 |
Turbulence intensity measurements in the backflow region around a spur dike |
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| CHEN Zhicong,HEI Pengfei,DING Xiang.Turbulence intensity measurements in the backflow region around a spur dike[J].Journal of Tsinghua University(Science and Technology),2008(12). |
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| Authors: | CHEN Zhicong HEI Pengfei DING Xiang |
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| Institution: | CHEN Zhicong,HEI Pengfei,DING Xiang(Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | Spur dikes are built to protect banks and improve channels.The turbulence characteristics of the backflow region around a spur dike were measured in a glass tank to better analyze the scouring and sedimentation mechanics. A 3-D dynamic particle analyzer was used to measure the turbulence intensities in three sub-regions,the reverse-velocity backflow region,the positive-velocity backflow region and the main flow region.The results show that the turbulence intensity is greatly strengthened by the spur dike,pa... |
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| Keywords: | spur dikes glass tank tests backflow turbulence intensity |
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