Experimental analysis of low-Reynolds number free jets: Evolution along the jet centerline and Reynolds number effects

被引：48
|
作者：
Todde V. [1 ]
Spazzini P.G. [2 ]
Sandberg M. [1 ]
机构：
[1] Department of Indoor Environment, KTH Research School, University of Gävle
[2] I.N.Ri.M., Fluid Dynamics Group, Politecnico di Torino, Turin 10129
来源：
Experiments in Fluids | 2009年 / 47卷 / 02期
关键词：
Vortex; Reynolds Number; Shear Layer; Ring Vortex; Nozzle Exit;
D O I：
10.1007/s00348-009-0655-0
中图分类号：
学科分类号：
摘要：
The present paper analyzes the features of a low-Reynolds number free submerged jet with special regard to statistical quantities on the jet centerline. Measurements in an environment with very low disturbances allowed to observe details of turbulence and higher-order moments. Some peculiar features of the measured (natural) jet are shown to be in correspondence to observations referring to forced higher-Reynolds number jets. In particular, it is shown that, at low Reynolds numbers, the initial region of the jet is dominated by well-defined vortices in the shear layer. This result is substantiated by both the statistical moments and the spectral analysis. The presence of two distinct regimes is evidenced and discussed from a physical standpoint, also in relation to the mathematical analysis of the jet structure from the bibliography. © 2009 Springer-Verlag.
引用
收藏
页码：279 / 294
页数：15
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