【摘要】 本文通过采用激光诱导荧关技术(LIF),对按正方形排列、边长间距比为4的顺排的四个圆柱的层流绕流进行了流动可视化研究;同时,在Re=200的情况下,对该流场进行了PIV流场测量,两种实验结果吻合良好,显示的都是只在下游圆柱的后面才有漩涡脱落。可是,采用两维有限体积法离散N-S方程计算该流场与实验结果完全不符合,原因尚不清楚。更多还原

【Abstract】 The investigations of the cross flow around four cylinders arranged in an in-line square configuration with spacing ratio of 4 were conducted at low Reynolds number using laser-induced-fluorescence (LIF) visualization in this paper. The particle image velocimetry (PIV) measurements on the same flow field at Re = 200 were also carried out, and it was found that the experimental results of these two different methods showed the same flow patterns, i.e., the vortex shedding existed only after the downstream cylinders. However, the numerical results based on two dimensional N-S equations showed a completely different flow pattern. It is hard to explain this discrepancy at present.更多还原