The intermediate wake of a body of revolution at high Reynolds numbers
The intermediate wake of a body of revolution at high Reynolds numbers
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DOI：
10.1017/s0022112010002715
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发表时间：
2010-07
影响因子：
3.7
通讯作者：
J. Jiménez;M. Hultmark;A. Smits
中科院分区：
文献类型：
--
作者：
J. Jiménez;M. Hultmark;A. Smits
给出了模型长度为1.1×106~67×106的回转体下游流场的雷诺数计算结果。最大雷诺数比以前的实验室尾迹研究结果大一个数量级以上。在中线平面上，在船尾下游3、6、9、12和15直径处的中间尾迹处进行测量。该模型是以理想的潜艇外形(DARPA SUBOFF)为基础，安装在风洞中的一个半无限风帆形状的支架上。支撑体相对一侧的平均速度分布在所有位置和雷诺数上都表现出自相似性，而支撑体一侧的平均速度分布则表现出明显的支撑尾迹效应。流动的雷诺应力分布没有一个是自相似的，除了最低雷诺数外，支承在尾迹中引入了显著的不对称性，导致支承侧径向和流向湍流强度的降低。随着下游位置和雷诺数的增加，分布继续演变，但随着下游距离的增加，接近预期渐近行为的速度很慢。
Results are presented on the flow field downstream of a body of revolution for Reynolds numbers based on a model length ranging from 1.1 × 106 to 67 × 106. The maximum Reynolds number is more than an order of magnitude larger than that obtained in previous laboratory wake studies. Measurements are taken in the intermediate wake at locations 3, 6, 9, 12 and 15 diameters downstream from the stern in the midline plane. The model is based on an idealized submarine shape (DARPA SUBOFF), and it is mounted in a wind tunnel on a support shaped like a semi-infinite sail. The mean velocity distributions on the side opposite the support demonstrate self-similarity at all locations and Reynolds numbers, whereas the mean velocity distribution on the side of the support displays significant effects of the support wake. None of the Reynolds stress distributions of the flow attain self-similarity, and for all except the lowest Reynolds number, the support introduces a significant asymmetry into the wake which results in a decrease in the radial and streamwise turbulence intensities on the support side. The distributions continue to evolve with downstream position and Reynolds number, although a slow approach to the expected asymptotic behaviour is observed with increasing distance downstream.