An experimental study of large-scale vortices over a blunt-faced flat plate in pulsating flow

An experimental study of large-scale vortices over a blunt-faced flat plate in pulsating flow  Laboratory measurements are made of flow over a blunt flat plate of finite thickness, which is placed in a pulsating free stream, U=U o (1+A o cos 2πf p t). Low turbulence-intensity wind tunnel experiments are conducted in the ranges of St p≤1.23 and A o ≤0.118 at Re H=560. Pulsation is generated by means of a woofer speaker. Variations of the time-mean reattachment length x R as functions of St p and A o are scrutinized by using the forward-time fraction and surface pressure distributions (C p). The shedding frequency of large-scale vortices due to pulsation is measured. Flow visualizations depict the behavior of large-scale vortices. The results for non-pulsating flows (A o =0) are consistent with the published data. In the lower range of A o , as St p increases, x R attains a minimum value at a particular pulsation frequency. For large A o , the results show complicated behaviors of x R. For St p≥0.80, changes in x R are insignificant as A o increases. The shedding frequency of large-scale vortices is locked-in to the pulsation frequency. A vortex-pairing process takes place between two neighboring large-scale vortices in the separated shear layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

An experimental study of large-scale vortices over a blunt-faced flat plate in pulsating flow

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Publisher
Springer-Verlag
Copyright
Copyright © 2001 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/s003480000155
Publisher site
See Article on Publisher Site

Abstract

 Laboratory measurements are made of flow over a blunt flat plate of finite thickness, which is placed in a pulsating free stream, U=U o (1+A o cos 2πf p t). Low turbulence-intensity wind tunnel experiments are conducted in the ranges of St p≤1.23 and A o ≤0.118 at Re H=560. Pulsation is generated by means of a woofer speaker. Variations of the time-mean reattachment length x R as functions of St p and A o are scrutinized by using the forward-time fraction and surface pressure distributions (C p). The shedding frequency of large-scale vortices due to pulsation is measured. Flow visualizations depict the behavior of large-scale vortices. The results for non-pulsating flows (A o =0) are consistent with the published data. In the lower range of A o , as St p increases, x R attains a minimum value at a particular pulsation frequency. For large A o , the results show complicated behaviors of x R. For St p≥0.80, changes in x R are insignificant as A o increases. The shedding frequency of large-scale vortices is locked-in to the pulsation frequency. A vortex-pairing process takes place between two neighboring large-scale vortices in the separated shear layer.

Journal

Experiments in FluidsSpringer Journals

Published: Feb 6, 2001

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