Coherent helical structures in swirl flows

被引：0
|
作者：
S. I. Shtork
C. E. Cala
E. C. Fernandes
M. V. Heitor
机构：
[1] Russian Academy of Sciences,Institute of Thermophysics, Siberian Division
[2] Technical University of Lisbon,Laboratory of Thermofluids, Combustion, and Energy Systems, Center for Innovation, Technology, and Policy Research
来源：
Technical Physics Letters | 2005年 / 31卷
关键词：
Vortex; Opposite Direction; Flow Field; Output Signal; Velocity Gradient;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A nonstationary flow with rotating helical filaments formed in the region of swirl flow breakdown has been studied using the method of phase averaging of the output signal of a laser Doppler velocimeter. Vortices in the measured flow field were separated using the λ2 technique based on an analysis of the velocity gradient tensor. It is shown for the first time that precession of the central monopolar vortex is accompanied by the formation of a pair of secondary vortices with the opposite directions of circulation, which form a helical dipole structure.
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页码：660 / 662
页数：2
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