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Numerical simulation of detonation initiation and propagation in supersonic combustible mixtures with non-uniform species

Numerical simulation of detonation initiation and propagation in supersonic combustible mixtures with non-uniform species
Numerical simulation of detonation initiation and propagation in supersonic combustible mixtures with non-uniform species
Adaptive high-resolution simulations of gaseous detonation using a hot jet initiation were conducted in supersonic combustible mixtures with spatially non-uniform species. The two-dimensional Euler equations were used as the governing equations in combination with a detailed hydrogen-oxygen reaction model. Three different groups of mixtures, which represent various degrees of chemical reactivity, were investigated. The results show that when the mixtures generally have a high degree of chemical reactivity, detonation initiation can eventually be realized successfully by Mach reflection as well as the DDT mechanism, independent of the spatial distribution of the mixture in the channel. A recurring four-stage sequence of detonation initiation, detonation attenuation, initiation failure and detonation reinitiation can be identified. When the mixtures generally have an intermediate degree of chemical reactivity, detonation combustion can be fully realized in the channel, where different degrees of overdrive are found in the upper lower half. After the shutdown of the hot jet, the overdriven detonation attenuates gradually and eventually a slightly overdriven detonation and a slightly underdriven detonation are generated, which can be regarded as a new stable state of propagation. However, whether a detonation can be initiated successfully is determined by the spatial mixture distribution. In mixtures with low degree of chemical reactivity, detonation initiation can generally not be realized. In this case, successful realization of detonation initiation should be realizable by using of a stronger hot jet.
detonation combustion, hot jet initiation, supersonic combustible mixtures, non-uniform species, chemical reactivity
0001-1452
2449-2462
Cai, Xaidong
8d778bd0-f391-488d-b998-4f851382d9f8
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723
Cai, Xaidong
8d778bd0-f391-488d-b998-4f851382d9f8
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723

Cai, Xaidong, Liang, Jianhan, Deiterding, Ralf and Lin, Zhiyong (2016) Numerical simulation of detonation initiation and propagation in supersonic combustible mixtures with non-uniform species. AIAA Journal, 54 (8), 2449-2462. (doi:10.2514/1.J054653).

Record type: Article

Abstract

Adaptive high-resolution simulations of gaseous detonation using a hot jet initiation were conducted in supersonic combustible mixtures with spatially non-uniform species. The two-dimensional Euler equations were used as the governing equations in combination with a detailed hydrogen-oxygen reaction model. Three different groups of mixtures, which represent various degrees of chemical reactivity, were investigated. The results show that when the mixtures generally have a high degree of chemical reactivity, detonation initiation can eventually be realized successfully by Mach reflection as well as the DDT mechanism, independent of the spatial distribution of the mixture in the channel. A recurring four-stage sequence of detonation initiation, detonation attenuation, initiation failure and detonation reinitiation can be identified. When the mixtures generally have an intermediate degree of chemical reactivity, detonation combustion can be fully realized in the channel, where different degrees of overdrive are found in the upper lower half. After the shutdown of the hot jet, the overdriven detonation attenuates gradually and eventually a slightly overdriven detonation and a slightly underdriven detonation are generated, which can be regarded as a new stable state of propagation. However, whether a detonation can be initiated successfully is determined by the spatial mixture distribution. In mixtures with low degree of chemical reactivity, detonation initiation can generally not be realized. In this case, successful realization of detonation initiation should be realizable by using of a stronger hot jet.

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Numerical simulation on detonation initiation and propagation in supersonic combustible mixtures.pdf - Accepted Manuscript
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Accepted/In Press date: 21 January 2016
e-pub ahead of print date: 4 May 2016
Published date: 1 August 2016
Keywords: detonation combustion, hot jet initiation, supersonic combustible mixtures, non-uniform species, chemical reactivity
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 386868
URI: https://eprints.soton.ac.uk/id/eprint/386868
ISSN: 0001-1452
PURE UUID: bb41adba-dc85-40ab-8abb-62833c0b08b4
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

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Date deposited: 05 Feb 2016 09:21
Last modified: 07 Aug 2019 00:31

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Contributors

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

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