Flow characteristics of various three-dimensional rounded contour bumps in a Mach 1.3 freestream

Lo, K. H. and Kontis, K. (2017) Flow characteristics of various three-dimensional rounded contour bumps in a Mach 1.3 freestream. Experimental Thermal and Fluid Science, 80, pp. 228-243. (doi: 10.1016/j.expthermflusci.2016.08.027)

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Streamwise and spanwise flow pattern over three rounded contour bumps with different flow control strategies employed have been experimentally investigated in a Mach 1.3 freestream. Surface oil flow visualisation, Schlieren photography and particle image velocimetry measurements were used for flow diagnostics. Experimental data showed that in a Mach 1.3 freestream over the baseline plain bump, significant flow separation appeared at the bump crest that led to the formation of a large wake region downstream. In addition, two large counter-rotating spanwise vortices were formed in the bump valley. It was observed that the use of the passive by-pass blowing jet in the bump valley showed no obvious effects in reducing the sizes of both the wake region and the spanwise vortices in the bump valley. In contrast, it was found that the size of the wake region and the spanwise vortices could be reduced by blowing sonic jet in the bump valley. This approach of flow control found to be the most effective when the total pressure of the blowing jet was 2 bar. It is deduced that the active blowing jet hindered the formation of the spanwise vortices in the bump valley as well as deflected the shear layer downwards so that a smaller re-circulating bubble was formed downstream of the bump crest.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Lo, Dr Kin Hing and Kontis, Professor Konstantinos
Authors: Lo, K. H., and Kontis, K.
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Experimental Thermal and Fluid Science
ISSN (Online):1879-2286
Published Online:30 August 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Experimental Thermal and Fluid Science 80:228-243
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
650961ICASE student transfer from Manchester - EngineeringKonstantinos KontisEngineering & Physical Sciences Research Council (EPSRC)EP/K504488/1ENG - AEROSPACE SCIENCES