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中文摘要：
为探讨淹没双丁坝对坝间水流的影响,采用粒子图像测速（PIV）系统对坝间水平面流场进行了测量,并对坝间水流结构进行了分析.结果表明：丁坝间距与丁坝长度的比值d / B（B 为定值）对坝间漩涡中心位置、坝间回流区及涡量分布有着显著影响;d / B 越大,坝间“漩涡冶中心越接近坝头线;坝间回流区宽度随d / B 增大而增大,零速度线基本呈线性关系且其斜率随d / B 增大而减小,同时回流区流速也随之发生很大变化;上游丁坝头附近出现最大负涡量而在下游丁坝头附近出现最大正涡量.
英文摘要：
In order to study the influence of submerged double spur dikes on the flow characteristics between them, this study measured the horizontal flow field within the area between the spur dikes using a particle image velocimetry ( PIV) system, and analyzed the flow characteristics between the spur dikes. Results show that the ratio of the gap between the double spur dikes to the dike length d/B ( B is a constant) has a significant impact on the location of the eddy’ s core between the spur dikes, the recirculation flow between the spur dikes, and the vorticity distribution around the heads of the spur dikes. When the value of d/B increases, the eddy’ s core is closer to the line connecting the tips of the spur dikes, and the width of the recirculation zone increases. The zero velocity line changes linearly in the streamwise direction, and its slope decreases with the increase of d/B. The velocity in the recirculation zone changes significantly with the value of d/B. The maximum negative vorticity occurs near the head of the upstream spur dike, while the maximum positive vorticity occurs near the head of the downstream spur dike.
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