Tomographic PIV measurements of a regenerating hairpin vortex
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- 作者：D. R. Sabatino ; T. Rossmann
- 刊名：Experiments in Fluids
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：57
- 期：1
- 全文大小：6,571 KB
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T. Rossmann (1)
1. Department of Mechanical Engineering, Lafayette College, Easton, PA, 18042, USA - 刊物类别：Engineering
- 刊物主题：Engineering Fluid Dynamics
Fluids
Industrial Chemistry and Chemical Engineering
Measurement Science and Instrumentation
Thermodynamics
Theoretical and Applied Mechanics - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1114
文摘
The three-dimensional formation and regeneration of a hairpin vortex in a laminar boundary layer is studied in a free-surface water channel. The vortex is generated by fluid injection through a narrow slot into a laminar boundary layer \((Re_{\delta ^*} = 485)\) and recorded with tomographic particle image velocimetry. The swirling strength based on the \(\lambda _2\) criterion shows that the hairpin initially forms at the upstream edge of the elongated ring vortex produced by the injection. The elongated ring vortex decays while the hairpin vortex strengthens. Because the hairpin vortex is of sufficient strength, it forms a kink in the legs as a result of inviscid induction. A bridging structure forms between the legs initially upstream of the kink. As this structure dissipates, another bridging structure forms downstream of the kink and closes the vortex loop between the legs. This pinches off the original hairpin head such that two distinct vortices result. The formation of the secondary hairpin head does not appear to be preceded by a reduction in the spanwise gap between the legs or significant change in height above the wall as has been seen when exposed to a mean turbulent profile. Instead, the formation is preceded by the stretching of the hairpin legs downstream of the kink, exposes the ejected fluid between the legs to boundary layer flow producing conditions similar to those that formed the initial hairpin vortex. Supported by the National Science Foundation under Grant CBET-1040236.