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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.
ISSN: 0142-727X
Appears in Collections:Publications
Mechanical and Aerospace Engineering
Dept of Mechanical Aerospace and Civil Engineering Research Papers

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