Experimental investigation of impinging shock – cavity interactions with upstream transverse jet injection

Zare-Behtash, H. , Lo, K. H., Ukai, T., Kontis, K. and Obayashi, S. (2014) Experimental investigation of impinging shock – cavity interactions with upstream transverse jet injection. Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, 12(ists29), pp. 57-62. (doi: 10.2322/tastj.12.Pe_57)

Abstract

Mixing between the injected fuel and high speed free stream air is challenging at supersonic speeds. Placing cavities downstream of injection holes or slots addresses the problem of flame holding and stabilisation, however there are still open questions related to mixing enhancement, uniformity and efficiency. The present study examines experimentally the flow field interactions due to a transverse jet - cavity combination with shock impingement at supersonic speeds using PIV, Schlieren photography, and oil flow surface visualisation. The oblique shock lifts the shear layer over the cavity and combined with the instabilities generated by the transverse jet injection creates a highly complicated flowfield with numerous vortical structures. The interaction between the oblique shock and the jet leads to a relatively uniform velocity distribution within the cavity. The lifting of the shear layer is also believed to reduce the drag created by the cavity.

• Item Type: Articles (Editorial)
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lo, Dr Kin Hing and Zare-Behtash, Dr Hossein and Kontis, Professor Konstantinos and Ukai, Dr Takahiro
• Authors: Zare-Behtash, H., Lo, K. H., Ukai, T., Kontis, K., and Obayashi, S.
• Subjects: Q Science > Q Science (General); Q Science > QC Physics
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan
• Publisher: Japan Society for Aeronautical and Space Sciences
• ISSN: 1884-0485
• Copyright Holders: Copyright © 2014 Japan Society for Aeronautical and Space Sciences
• First Published: First published in Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan 12(ists29):57-62
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher.