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Dye visualisation of inclined and skewed synthetic jets in a cross flow

Published online by Cambridge University Press:  03 February 2016

S. Zhong ,
L. Garcillan  and
N. J Wood
S. Zhong
Affiliation:
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
L. Garcillan
Affiliation:
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
N. J Wood
Affiliation:
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
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Abstract

Dye visualisation of both inclined synthetic jets and skewed synthetic jets was undertaken in a cross-flow experiment and the results were compared with those of normal synthetic jets. The process of vortex roll-up near the orifice exit and how the structure develops and interacts with the cross-flow as it propagates downstream was investigated so as to obtain an understanding of the effect of orifice orientation on the behaviour of synthetic jets. The effects of varying Reynolds number, velocity ratio and Strouhal number due to changes in diaphragm displacements and freestream velocities on the characteristics of synthetic jets were also examined. It is observed that in comparison to the normal jets vortical structures produced by both inclined and skewed jets tend to stay closer to the near wall region where maximum flow control effect is required. In both cases, at a relatively low Reynolds number and velocity ratio the active structures produced by the synthetic jet appear to be hairpin vortices which turn into vortex rings that migrate away from the wall as the Reynolds number and velocity ratio increase. These hairpin vortices are persistent in the near wall region hence are believed to be desirable structures for delaying flow separation.

Type
Research Article
Information
The Aeronautical Journal , Volume 109 , Issue 1093 , March 2005 , pp. 147 - 155
Copyright
Copyright © Royal Aeronautical Society 2005 

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