Influence of orifice-to-wall distance on synthetic jet vortex rings impinging on a fixed wall

被引:0
|
作者
Yang Xu
LiHao Feng
机构
[1] Beijing University of Aeronautics and Astronautics,Fluid Mechanics Key Laboratory of Education Ministry
来源
Science China Technological Sciences | 2013年 / 56卷
关键词
vortex ring; orifice-to-wall distance; impingement; wall; secondary vortex; statistical characteristic;
D O I
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中图分类号
学科分类号
摘要
Two-dimensional particle image velocimetry (PIV) is used to investigate the influence of the orifice-to-wall distance on synthetic jet vortex rings impinging on a fixed wall. Both evolutions of vortical structures and statistical characteristics of flow fields at different orifice-to-wall distances are presented. It is found that different orifice-to-wall distances have different effects in terms of the vortex strength and impinging speed when the vortex rings are approaching the wall. The secondary vortex ring can be observed within the shear layer only when the dimensionless orifice-to-wall distance is close to or less than the dimensionless stroke length. Consequently, an appropriate orifice-to-wall distance plays a vital role in the sense of impingement effect. The statistical analysis of the flow field indicates that a wall jet forms after impingement, while both the decay rate of the maximum radial velocity and the spreading rate of the half-width decrease with the increasing orifice-to-wall distance. The non-dimensional wall jet velocity profiles at different orifice-to-wall distances all exhibit self-similar behaviors, which is consistent with the theoretical solution of the laminar wall jet.
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页码:1798 / 1806
页数:8
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