Effect of back-pressure forcing on shock train structures in rectangular channels

Gnani, F., Zare-Behtash, H., White, C. and Kontis, K. (2018) Effect of back-pressure forcing on shock train structures in rectangular channels. Acta Astronautica, 145, pp. 471-481. (doi:10.1016/j.actaastro.2018.02.010)

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Abstract

The deceleration of a supersonic flow to the subsonic regime inside a high-speed engine occurs through a series of shock waves, known as a shock train. The generation of such a flow structure is due to the interaction between the shock waves and the boundary layer inside a long and narrow duct. The understanding of the physics governing the shock train is vital for the improvement of the design of high-speed engines and the development of flow control strategies. The present paper analyses the sensitivity of the shock train configuration to a back-pressure variation. The complex characteristics of the shock train at an inflow Mach number M = 2 in a channel of constant height are investigated with two-dimensional RANS equations closed by the Wilcox k-ω turbulence model. Under a sinusoidal back-pressure variation, the simulated results indicate that the shock train executes a motion around its mean position that deviates from a perfect sinusoidal profile with variation in oscillation amplitude, frequency, and whether the pressure is first increased or decreased.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:White, Dr Craig and Kontis, Professor Konstantinos and Gnani, Francesca and Zare-Behtash, Dr Hossein
Authors: Gnani, F., Zare-Behtash, H., White, C., and Kontis, K.
Subjects:Q Science > Q Science (General)
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:Acta Astronautica
Publisher:Elsevier
ISSN:0094-5765
ISSN (Online):0094-5765
Published Online:15 February 2018
Copyright Holders:Copyright © 2018 Crown Copyright
First Published:First published in Acta Astronautica 145: 471-481
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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