控制和减小丁坝下游回流影响的实验  

Controlling recirculating regions downstream of spur dikes

作　　者：马永军[1] 陈稚聪[1] 丁翔[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第8期1096-1099,共4页Journal of Tsinghua University(Science and Technology)

基　　金：中国三峡总公司基础性研究基金项目

摘　　要：流动边界出现凸出障碍物会引起边界层分离,导致回流发展、流态恶化、泥沙淤积等一系列问题。作者在50cm宽的水槽中进行了系列实验,用丁坝模拟凸出障碍物,采用"吸、喷"水方法。这样可以改变障碍物周围的水流流态,缩小其尾流回流范围,大幅度减少回流淤积,效果十分明显。根据大量实验数据得出了"吸、喷"流量大小与回流尺度减小和回流淤积减少的关系式。研究结果有重要的学术意义和很大的实用价值。Boundary layers will separate along a curved dike causing circulating flow regions which affect the overall flow field and increase sedimentation. Separation and increased sedimentation are common phenomena in water conservancy projects. The effects of blowing and suction on the separation were investingated experimentally in a 50 cm wide flume with a dike placed as a barrier. The blowing and suction improved the flow pattern, reduced the size of the recirculating region and reduced the sedimentation volume caused by the recirculating flow. The experimental data was used to relate the size of the recirculating region and the sedimentation volume to the blowing and suction discharge. 

关 键 词：丁坝 回流 回流尺度 回流淤积量 水流模型观测 边界层 水流流态 

分 类 号：TV135.1[水利工程—水力学及河流动力学]