Vortex stretching in a laminar boundary layer flow

被引：8
|
作者：
Petitjeans, P [1 ]
Wesfreid, JE [1 ]
Attiach, JC [1 ]
机构：
[1] LOT ORIEL,F-91951 LES ULIS,FRANCE
来源：
EXPERIMENTS IN FLUIDS | 1997年 / 22卷 / 04期
关键词：
Vortex; Boundary Layer; Vorticity; Velocity Flow; Velocity Profile;
D O I：
10.1007/s003480050059
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
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 ultrasonic pulsed Doppler velocimeter. Several modes of destabilization are observed and include pairing of two vortices, hairpin deformation, and vortex breakdown into a coil shape.
引用
收藏
页码：351 / 353
页数：3
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