Some observations of the vortex breakdown phenomenon
Some observations of the vortex breakdown phenomenon
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DOI：
10.1017/s0022112062001470
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发表时间：
1962-12
影响因子：
3.7
通讯作者：
J. Harvey
中科院分区：
文献类型：
--
作者：
J. Harvey
本文介绍了一种利用长管中形成的圆柱涡来研究细长三角翼绕流中已报道的“涡破裂”现象的实验。通过改变流体进入管内之前被赋予的旋涡量，发现破裂是两种基本类型的旋转流之间的中间阶段，即有旋转流和没有轴向速度反转的旋转流。此外，研究还表明，在破裂后建立了一种不寻常的流动模式，这种流动的某些特征表明这是一种“临界”现象。这些测试是通过测量击穿前一小段距离的旋涡角度分布，并将这些结果与Squire理论(1960)的预测进行比较而得出的。
This paper describes an experiment in which a cylindrical vortex, formed in a long tube, was used to study the ‘vortex breakdown’ that has been previously reported in investigations of the flow over slender delta wings. By varying the amount of swirl that was imparted to the fluid before it entered the tube, it was found that the breakdown was the intermediate stage between the two basic types of rotating flows, that is, those that do and those that do not exhibit axial velocity reversal. In addition, it was shown that an unusual flow pattern was established after the breakdown and that certain features of this pointed to it being a ‘critical’ phenomenon. The tests were concluded by measuring the swirl angle distribution a short distance ahead of the breakdown and comparing these results with the prediction of Squire's theory (1960).