浅水平板半岛尾流特性的实验研究

对于尾流的研究大都局限于岛屿型绕流体在展向非常长的情况,但是在天然环境和水利工程中出现的多为水深相对很浅的流动,并且很多是绕半岛形建筑物的流动。由于底部摩阻和壁面边界的限制,浅水域中的半岛尾流有着一些特殊的流动规律。笔者采用数字粒子图像测速(DPIV)技术,在长30m、宽3.5m、高1m的水槽中比较系统地测量了浅水中绕平板半岛的尾流区流场,分析了大尺度旋涡的运动规律,得到了控制尾流流动形式的稳定性参数的临界范围。

Experimental study of shallow wake flow of plate peninsula

Most of the researches on wake concentrate on island-type objects with very large length scale in the spanwise direction. However, for most of the flows in natural environments and hydraulic projects, the water depth is often very small and the wake generator is often peninsula-type object. Due to the emergence of the side and bottom walls, the shallow wake of peninsula is very different from those widely studied wakes before. Digital Particle Image Velocimetry (DPIV) technique is employed in this study to systematically measure the flow field of shallow wake generated by plate peninsula. The experiments are carried out in a 30m long, (3.5m) wide and 1m deep flume. The movement of large-scale vortex is analyzed. The range of the critical wake stability parameter is acquired.