Flow visualisation of a normal shock impinging over a rounded contour bump in a Mach 1.3 free-stream

Lo, K. H. and Kontis, K. (2017) Flow visualisation of a normal shock impinging over a rounded contour bump in a Mach 1.3 free-stream. Journal of Visualization, 20(2), pp. 237-249. (doi: 10.1007/s12650-016-0392-4)

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An experimental study has been conducted to visualise the instantaneous streamwise and spanwise flow patterns of a normal shock wave impinging over a rounded contour bump in a Mach 1.3 free-stream. A quartz-made transparent shock generator was used, so that instantaneous images could be captured during the oil-flow visualisation experiments. Fluorescent oil with three different colours was used in the surface oil-flow visualisation experiment to enhance the visualisation of flow mixing and complicated flow features that present in the flow field. Experimental data showed that the rounded contour bump could split the impinging normal shock wave into a or a series of lambda-shaped shock wave structure(s). In addition, it was found that the flow pattern and the shock wave structures that appeared over the rounded contour bump depended highly on the impinging location of the normal shock wave. The flow pattern shown in this study agreed with the findings documented in literature. Moreover, it was observed from the instantaneous oil streaks that the normal shock impinging location also affected the size and the formation location of the spanwise counter-rotating vortices downstream of the bump crest. Finally, it was concluded that the terminating shock could distort the oil streaks that left over the surface of the contour bump. Therefore, the use of the transparent normal shock wave generator is recommended when conducting experiments with normal shock wave impingement involved.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Lo, Dr Kin Hing and Kontis, Professor Konstantinos
Authors: Lo, K. H., and Kontis, K.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Journal of Visualization
ISSN (Online):1875-8975
Published Online:02 September 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Journal of Visualization 20(2): 237-249
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