The University of Southampton
University of Southampton Institutional Repository

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture
Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture
Two-dimensional reactive Euler equations with a detailed reaction model where the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture. Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet. It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture. After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.
0360-3199
6917-6928
Cai, Xiaodong
293bf621-f0e1-48ba-abaa-b41da81ea244
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723
Cai, Xiaodong
293bf621-f0e1-48ba-abaa-b41da81ea244
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723

Cai, Xiaodong, Liang, Jianhan, Deiterding, Ralf and Lin, Zhiyong (2016) Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture. International Journal of Hydrogen Energy, 41 (16), 6917-6928. (doi:10.1016/j.ijhydene.2016.02.144).

Record type: Article

Abstract

Two-dimensional reactive Euler equations with a detailed reaction model where the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture. Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet. It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture. After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.

Text
Adaptive simulations of cavity-based detonation.pdf - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 29 February 2016
e-pub ahead of print date: 4 April 2016
Published date: 4 May 2016
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 393661
URI: http://eprints.soton.ac.uk/id/eprint/393661
ISSN: 0360-3199
PURE UUID: b7e963fd-5311-4437-ab0d-99e452d334f2
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

Catalogue record

Date deposited: 29 Apr 2016 10:42
Last modified: 17 Dec 2019 06:50

Export record

Altmetrics

Contributors

Author: Xiaodong Cai
Author: Jianhan Liang
Author: Ralf Deiterding ORCID iD
Author: Zhiyong Lin

University divisions

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.

×