Vortex stretching in a laminar boundary layer flow

被引：0
|
作者：
P. Petitjeans
J. E. Wesfreid
J. C. Attiach
机构：
[1] Laboratoire de Physique et de Mécanique des Milieux Hétérogènes URA CNRS 857 Ecole Supérieure de Physique et de Chimie Industrielles (ESPCI) 10,
[2] rue Vauquelin,undefined
[3] F-75005 Paris,undefined
[4] France,undefined
[5] Lot Oriel,undefined
[6] 9 avenue de Laponie,undefined
[7] F-91951 Les Ulis Cedex,undefined
[8] France,undefined
来源：
Experiments in Fluids | 1997年 / 22卷
关键词：
Vortex; Boundary Layer; Vorticity; Velocity Flow; Velocity Profile;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
 A new technique to produce controlled stretched vortices is presented. The initial vorticity comes from a laminar boundary layer flow and the stretching is parallel to the initial vorticity. This low velocity flow enables direct observations of the formation and destabilization of vortices. Visualizations are combined with quasi-instantaneous measurements of a full velocity profile obtained with an ultra-sonic pulsed Doppler velocimeter. Several modes of destabilization are observed and include pairing of two vortices, hairpin deformation, and vortex breakdown into a coil shape.
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页码：351 / 353
页数：2
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