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中文摘要：
为得到高雷诺数（1×10^5-1×10^6）条件下顶盖驱动方腔水流流场和速度分布,设计了边长为0.2 m和0.5 m的立方腔,并利用粒子图像测速技术（Particle Image Velocimetry,PIV）对方腔流流场进行测量,分析方腔流流场特性和边壁对流场影响规律。结果表明：雷诺数达到5×10^5时方腔流中主涡旋发生变形,雷诺数从5×10^5增大到1×10^6过程中,中间的初级涡旋（Primary eddy,PE）继续变形,并分裂成两个涡旋;随着雷诺数的增大,顺流次级涡旋（Downstream Secondary Eddy Region,DSE）区域面积缩小,雷诺数为5×10^5时DSE区域可看到成型的涡旋,当雷诺数为1×10^6时,DSE区域继续缩小,在同样条件下看不到成型的涡旋;雷诺数增大的过程中各边壁的边界层变薄,边壁对方腔流流场特性影响明显。
英文摘要：
Laboratory experiments have been conducted to study high Reynolds number（ from 1 × 10^5 to 1 × 10^6）,three-dimensional lid-driven cavity flows in two cavity dimensions： 0. 2m × 0. 2m × 0. 2m and 0. 5m × 0. 5m × 0. 5m.Particle Image Velocimetry（ PIV） technical was applied to investigate the flow field and the effects of wall on the flow fields. Measured time-averaged streamlines show that the primary eddy starts to distort at Re = 5 × 10^5 and starts to breakup into two / three eddies at Re = 1 × 10^6. The region of Downstream Secondary Eddy（ DSE） decreases as the Reynolds number increases. At Re = 5 × 10^5,a fully developed DSE can be seen clearly. But it is hard to see when Re = 1 × 10^6. The thickness of boundary layer becomes thinner and thinner as the Reynolds number increases. The measurements also show that the side boundary has a significant impact of the primary eddy.
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