Vortex ring pinchoff in the presence of simultaneously initiated uniform background co-flow

被引:33
作者
Krueger, PS [1 ]
Dabiri, JO
Gharib, M
机构
[1] So Methodist Univ, Dept Mech Engn, Dallas, TX 75275 USA
[2] CALTECH, Grad Aeronaut Labs, Pasadena, CA 91125 USA
关键词
D O I
10.1063/1.1584436
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Vortex rings were formed with a piston-cylinder mechanism in the presence of uniform background co-flow supplied through a shroud surrounding the cylinder. The jet and co-flow were started simultaneously. Ratios of the co-flow to jet velocity (R-v) in the range 0-1 were considered. The formation number (F) as a function of R-v was determined using the procedure of Gharib [J. Fluid Mech. 360, 121 (1998)] and a generalized definition of formation time. The results show a sharp decrease in F as R-v increases from 0.5-0.75, suggesting possible performance limitations for pulsed-jet propulsion. (C) 2003 American Institute of Physics.
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页码:L49 / L52
页数:4
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