Flow field at a vertical-wall abutment
Flow field at a vertical-wall abutment
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垂直墙桥台处的流场
DOI：
10.1061/(asce)0733-9429(2005)131:12(1126
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. K. Barbhuiya
中科院分区：
文献类型：
--
作者：
S. Dey;A. K. Barbhuiya
采用声学多普勒测速仪对清水冲刷条件下短直墙桥台（桥台长度与引流深度之比小于1）冲刷坑形成前后的三维紊流流场进行了测量。在上游，通过垂直截面上的矢量表示的流场显示了与下游相关联的主涡。在下游，由于旋涡脱落，向上流动由不规则性组成。从湍动能分布来看，河床附近和冲刷坑内的水流分离是明显的。利用雷诺应力计算了床面切应力。
Experiments were conducted to measure the three-dimensional turbulent flow field, using the acoustic Doppler velocimeter, at a short vertical-wall abutment (ratio of abutment length to approach flow depth less than unity) before and after the development of a scour hole under a clear water scour condition. In the upstream, the presentation of flow field through vectors at vertical sections shows a primary vortex associated with the downflow. In the downstream, the upward flow is comprised of with irregularities owing to the vortex shedding. The flow separation near the bed and within the scour hole is evident from the turbulent kinetic energy distribution. Using Reynolds stresses, the bed shear stresses are calculated.