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为了深入研究尾流近区的流动规律 ,以便对岛屿后方的污染物混合输移特性有更清晰的了解 ,采用数字粒子图像测速 (digital particle image velocimetry,DPIV )技术 ,在恒定来流的工况下 ,分别对圆柱和正弦形状岛屿在尾流近区的速度分布进行了比较详细的测量 ,获得了大量的数据。文中着重从相似性的角度 ,对流速在长时间 (尾流摆动的一个周期 )内的平均值进行了分析。结果显示 ,沿程各断面的此种平均流速在归一化后具有一定的相似性 ,但是各断面归一化的紊动参数分布有很大的差别
In order to further study the law of the wake flow in the vicinity of the island so as to get a clearer understanding of the mixed transport characteristics of pollutants in the rear of the island, digital particle image velocimetry (DPIV) , The velocity distributions of the cylindrical and sinus island in the vicinity of the wake were measured in detail and a great deal of data were obtained. In the paper, we mainly analyze the average value of the flow velocity over a long period of time (one cycle of wake wakes) from the similarity point of view. The results show that the average velocities of each section along the course have some similarities after normalization, but the distribution of normalized turbulence parameters in each section is very different