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Title: | The near wall effect of synthetic jets in a boundary layer |
Authors: | Jabbal, M Zhong, S |
Keywords: | Synthetic jets;Boundary layer;Flow separation control;Vortex structures;Vortex rings;Crossflow |
Issue Date: | 2008 |
Publisher: | Elsevier Inc. |
Citation: | International Journal of Heat and Fluid Flow, 29(1): 119-130, Feb 2008 |
Abstract: | An experimental investigation to analyse the qualitative near wall effect of synthetic jets in a laminar boundary layer has been undertaken for the purpose of identifying the types of vortical structures likely to have delayed separation on a 2D circular cylinder model described in this paper. In the first instance, dye visualisation of the synthetic jet was facilitated in conjunction with a stereoscopic imaging system to provide a unique quasi three-dimensional identification of the vortical structures. Secondly, the impact of synthetic jet structures along the wall was analysed using a thermochromic liquid crystal-based convective heat transfer sensing system in which, liquid crystals change colour in response to the thermal footprints of a passing flow structure. Of the different vortical structures produced as a result of varying actuator operating and freestream conditions, the footprints of hairpin vortices and stretched vortex rings revealed a marked similarity with the oil flow pattern of a vortex pair interacting with the separation line on the cylinder hence suggesting that either of these structures was responsible in delaying separation. Conditions were established for the formation of the different synthetic jet structures in non-dimensional parameter space. |
Description: | Copyright @ 2007 Elsevier Inc. All rights reserved. |
URI: | http://www.sciencedirect.com/science/article/pii/S0142727X07001105 http://bura.brunel.ac.uk/handle/2438/5751 |
DOI: | http://dx.doi.org/10.1016/j.ijheatfluidflow.2007.07.011 |
ISSN: | 0142-727X |
Appears in Collections: | Publications Mechanical and Aerospace Engineering Dept of Mechanical and Aerospace Engineering Research Papers |
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