The University of Southampton
University of Southampton Institutional Repository

Shock-wave/boundary-layer interactions in transitional rectangular duct flows

Shock-wave/boundary-layer interactions in transitional rectangular duct flows
Shock-wave/boundary-layer interactions in transitional rectangular duct flows
Shock-wave/boundary-layer interactions (SBLI) are an important feature of high-speed gas dynamics. In many numerical studies of SBLI span-periodicity is assumed to reduce computational complexity. However, span-periodicity is not a valid assumption for aeronautical applications such as supersonic engine intakes where lateral confinement leads to highly three-dimensional behaviour. In this work transitional oblique SBLI are simulated for a rectangular duct with θsg = 5º shock generator ramp at Mach 2. The baseline configuration is a duct with an aspect ratio of 0.5. Time-dependent disturbances are added to the base laminar flow via wall localised blowing/suction strips to obtain intermittent transition upstream of the SBLI. Two forcing configurations are evaluated to assess the response of the SBLI to different tripping locations. The transition is observed to develop first in the low-momentum corners of the duct and spread out in a wedge shape. The central separation bubble is seen to react dynamically to oncoming turbulent spots, shifting laterally across the span. While instantaneous corner separations do occur, the time-averaged corner flow remains attached. Comparisons to a one-to-one aspect ratio duct show that the SBLI is heavily dependent on aspect ratio; the wider duct exhibited significantly larger regions of flow-reversal due to a strengthened interaction.
SBLI, flow-confinement, transition, flow-separation
1386-6184
Lusher, David
44ff9096-3c84-440a-9f64-946636aff985
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
Lusher, David
44ff9096-3c84-440a-9f64-946636aff985
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97

Lusher, David and Sandham, Neil (2020) Shock-wave/boundary-layer interactions in transitional rectangular duct flows. Flow Turbulence and Combustion. (doi:10.1007/s10494-020-00134-0).

Record type: Article

Abstract

Shock-wave/boundary-layer interactions (SBLI) are an important feature of high-speed gas dynamics. In many numerical studies of SBLI span-periodicity is assumed to reduce computational complexity. However, span-periodicity is not a valid assumption for aeronautical applications such as supersonic engine intakes where lateral confinement leads to highly three-dimensional behaviour. In this work transitional oblique SBLI are simulated for a rectangular duct with θsg = 5º shock generator ramp at Mach 2. The baseline configuration is a duct with an aspect ratio of 0.5. Time-dependent disturbances are added to the base laminar flow via wall localised blowing/suction strips to obtain intermittent transition upstream of the SBLI. Two forcing configurations are evaluated to assess the response of the SBLI to different tripping locations. The transition is observed to develop first in the low-momentum corners of the duct and spread out in a wedge shape. The central separation bubble is seen to react dynamically to oncoming turbulent spots, shifting laterally across the span. While instantaneous corner separations do occur, the time-averaged corner flow remains attached. Comparisons to a one-to-one aspect ratio duct show that the SBLI is heavily dependent on aspect ratio; the wider duct exhibited significantly larger regions of flow-reversal due to a strengthened interaction.

Text
Lusher_APPL-D-19-00261R1 - Accepted Manuscript
Restricted to Repository staff only until 31 March 2021.
Request a copy

More information

Accepted/In Press date: 31 March 2020
e-pub ahead of print date: 23 April 2020
Keywords: SBLI, flow-confinement, transition, flow-separation

Identifiers

Local EPrints ID: 439135
URI: http://eprints.soton.ac.uk/id/eprint/439135
ISSN: 1386-6184
PURE UUID: b0d27546-4d58-49a2-88a2-184b82eed526
ORCID for Neil Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 06 Apr 2020 16:30
Last modified: 16 Jul 2020 00:26

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×