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为揭示淹没丁坝坝后区域的水流特性,在实验室水槽中,采用平面二维粒子图像测速技术(2D-PIV),测量了光滑固定底床上单个丁坝在完全淹没条件下的坝后水平流场及垂向流场。通过分析测量获得了原始粒子图像和淹没丁坝坝后不同位置的平面二维时均速度场和涡量场,并耦合水平面流场与铅垂面流场结果,给出了丁坝坝后流场的部分三维特性。结果表明,淹没丁坝坝后存在明显的回流区,且在回流区内同时存在尺度大致相同的竖轴漩涡和横轴漩涡。
In order to reveal the characteristics of water flow in the area after the dams dam submerged, the horizontal two-dimensional particle image velocimetry (2D-PIV) technique was used to measure the post-dam horizontal flow field of single dams on a smooth and fixed bed under submerged conditions And vertical flow field. The two-dimensional average velocity field and vorticity field at different positions after inundation of the dams and dams were obtained through the analysis and measurement. Coupling the results of the horizontal flow field and the vertical flow field, Some three-dimensional characteristics. The results show that there are obvious recirculation zones after inundation of the dams and there are vertical axis swirls and horizontal axis swirls about the same size in the recirculation zone.