Experimental investigation of a synthetic jet impinging on a fixed wall

Experimental investigation of a synthetic jet impinging on a fixed wall The process of laminar vortex rings periodically impinging on a fixed wall is investigated experimentally using flow visualization and two-dimensional particle image velocimetry. The secondary vortex is found after the third impingement cycle, which is the first such observation at low Reynolds number of 126. In comparison, it does not form during the first three cycles, indicating that there exist obvious differences in the impingement process between the first few cycles and the rest. However, as the vortex ring continues to impinge on the wall, the differences eliminate gradually after about five cycles and similar impingement process among different cycles is found. The proper orthogonal decomposition fields and the statistical characteristics of the flow fields are also studied. In particular, both the streamwise velocity before the impingement and the radial velocity after the impingement exhibit self-similar behavior. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Experimental investigation of a synthetic jet impinging on a fixed wall

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Publisher
Springer-Verlag
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-013-1512-8
Publisher site
See Article on Publisher Site

Abstract

The process of laminar vortex rings periodically impinging on a fixed wall is investigated experimentally using flow visualization and two-dimensional particle image velocimetry. The secondary vortex is found after the third impingement cycle, which is the first such observation at low Reynolds number of 126. In comparison, it does not form during the first three cycles, indicating that there exist obvious differences in the impingement process between the first few cycles and the rest. However, as the vortex ring continues to impinge on the wall, the differences eliminate gradually after about five cycles and similar impingement process among different cycles is found. The proper orthogonal decomposition fields and the statistical characteristics of the flow fields are also studied. In particular, both the streamwise velocity before the impingement and the radial velocity after the impingement exhibit self-similar behavior.

Journal

Experiments in FluidsSpringer Journals

Published: Apr 17, 2013

References

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