Division and flow scale investigation of circulation zone around spur dike
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摘要: 通过三维激光颗粒动态分析仪(3D-PDA)对玻璃水槽内丁坝回流区的流速进行测量,获得了回流区流速分布的详细资料。根据流量连续原理和回流区流速分布,对丁坝回流区进行了区域划分:沿横向划分为负流速区、正流速区和主流区;沿纵向分为回流减流区和回流增流区。在此基础上进一步研究了回流尺度和回流流量沿纵向的变化规律。结果表明,回流区正负流区流量沿纵向呈纺锤形分布,负流速区和回流区的宽度在纵向基本呈线性变化。Abstract: The velocity distribution in the circulation zone around the spur dike is studied by 3D-PDA in the water tank in this paper.According to the distribution characteristic of the velocity and the flux,the general flow field can be divided into three regions in the transverse direction: the reverse-velocity backflow region,the positive-velocity backflow region and the main flow region; and two regions in longitudinal direction: the reverse flow velocity-increasing region and the reverse flow velocity-decreasing region.The longitudinal variation of the each region is also studied,which shows that the width of the negative velocity area and the circulation flow area changes linearly in the longitudinal direction.
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Key words:
- spur dike /
- partit ion of backflow region /
- scale of backflow region /
- flow /
- flow experiment
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