本文采用时变粒子图像速度场测试技术(TR-PIV),研究了低速循环水槽中近壁(G/D=0.1)二维方柱绕流的非定常流动特性.通过对实验得到的20000个连续瞬态速度场进行分析,得到了时均速度矢量场,速度大小分布和流向速度脉动强度分布.根据回流间歇系数的分布确定了时均再附点的位置.通过对原始速度场进行互相关分析,得到了流场中低频大尺度相干结构输运速度Uc=0.4U0.
参考文献
| [1] | Acharya S;Dutta S;Myrum TA et al.Turbulent Flow Past a Surface-Mounted Two-Dimensional Rib[J].Journal of Fluids Engineering,1994,116:238-246. |
| [2] | Bearman PW;Zdravkovich MM .Flow Around a Circular Cylinder Near a Plane Boundary[J].Journal of Fluid Mechanics,1978,89(01):33-47. |
| [3] | S. J. Price;D. Sumner;J. G. Smith;K. Leong;M. P. Paidoussis .Flow visualization and around a circular cylinder near to a plane wall[J].Journal of Fluids and Structures,2002(2):175-191. |
| [4] | Durao DFG;Gouveia PST;Pereira JCF .Velocity Characteristics of the Flow Around a Square Cross Section Cylinder Placed Near a Channel Wall[J].Experiments in Fluids,1991,11:341 350. |
| [5] | Y. Z. Liu;F. Ke;H. J. Sung .Unsteady separated and reattaching turbulent flow over a two-dimensional square rib[J].Journal of Fluids and Structures,2008(3):366-381. |
| [6] | Westerweel J;Dabiri D;Gharib M .The Effect of a Discrete Window Offset on the Accuracy of Cross-Correlation Analysis of Digital PIV Recordings[J].Experiments in Fluids,1997,23:20-28. |
| [7] | Yasuhiko Sugii;Shigeru Nishio;Taketoshi Okuno;Koji Okamoto .A highly accurate iterative PIV technique using a gradient method[J].Measurement Science & Technology,2000(12):1666-1673. |
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