Transverse jet-cavity interactions with the influence of an impinging shock

Zare-Behtash, H. , Lo, K.H., Kontis, K. , Ukai, T. and Obayashi, S. (2015) Transverse jet-cavity interactions with the influence of an impinging shock. International Journal of Heat and Fluid Flow, 53, pp. 146-155. (doi: 10.1016/j.ijheatfluidflow.2015.03.004)

Abstract

For high-speed air breathing engines, fuel injection and subsequent mixing with air is paramount for combustion. The high freestream velocity poses a great challenge to efficient mixing both in macroscale and microscale. Utilising cavities downstream of fuel injection locations, as a means to hold the flow and stabilise the combustion, is one mechanism which has attracted much attention, requiring further research to study the unsteady flow features and interactions occurring within the cavity. In this study we combine the transverse jet injection upstream of a cavity with an impinging shock to see how this interaction influences the cavity flow, since impinging shocks have been shown to enhance mixing of transverse jets. Utilising qualitative and quantitative methods: schlieren, oilflow, PIV, and PSP the induced flowfield is analysed. The impinging shock lifts the shear layer over the cavity and combined with the instabilities generated by the transverse jet creates a highly complicated flowfield with numerous vertical structures. The interaction between the oblique shock and the jet leads to a relatively uniform velocity distribution within the cavity.

• Item Type: Articles
• Additional Information: NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Heat and Fluid Flow. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Fluid Flow, [VOL 53, 2015] DOI http://dx.doi.org/10.1016/j.ijheatfluidflow.2015.03.004
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ukai, Dr Takahiro and Kontis, Professor Konstantinos and Lo, Dr Kin Hing and Zare-Behtash, Dr Hossein
• Authors: Zare-Behtash, H., Lo, K.H., Kontis, K., Ukai, T., and Obayashi, S.
• Subjects: Q Science > Q Science (General); T Technology > TA Engineering (General). Civil engineering (General); T Technology > TJ Mechanical engineering and machinery
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: International Journal of Heat and Fluid Flow
• Publisher: Elsevier
• ISSN: 0142-727X
• ISSN (Online): 1879-2278
• Copyright Holders: Copyright © 2015 Elsevier Ltd.
• First Published: First published in International Journal of Heat and Fluid Flow 53:146-155
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher