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Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model
Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model
Detonation combustion initiated with a hot jet in supersonic H2-O2-Ar mixtures are investigated by large-scale three-dimensional (3D) simulations in Tianhe-2 computing system with adaptive mesh refinement method. The reactive Euler equations are utilized as the governing equations with a detailed reaction model where the molar ratio of the combustible mixture is 2:1:7 under the condition of pressure 10kPa and temperature 298K. Results show that the Mach stem surface which is formed after the shock surface reflection on the upper wall is actually a local overdriven detonation. The side walls in 3D simulations can play an important role in detonation initiation in supersonic combustible mixtures, because they can help realize triple lines collisions and reflections during the initiation process. The width of the channel has an important influence on the strength of side-wall reflections, and under certain condition there might exist a critical width between the front and back sides of the channel for the successful initiation. Both the two-dimensional (2D) and the 3D detonations are overdriven and have a constant but different overdrive after their complete initiations. Although the overdrive degree of the 3D detonation is smaller than that of the 2D case, more complex and irregular detonation fronts can be observed in the 3D case compared with the 2D detonation, which is likely because of the propagation of transverse waves and collisions of triple lines in multi-directions in 3D detonations. After the hot jet is shut down, the newly formed 2D Chapman-Jouguet (CJ) detonation has almost the same characteristic parameters with the corresponding 3D case, indicating that the 2D instabilities can be perfectly preserved in 3D simulations. However, the slapping wave reflections on the side walls in the 3D detonation result in the second oscillation along with the main one, which presents stronger instabilities compared with the 2D case. The inherent stronger 3D instabilities is also verified through the quantitative comparison between the 2D and 3D cases where the 3D result always shows stronger fluctuations than the 2D case.
initiation and propagation, three-dimensional detonation, adaptive mesh refinement, hot jet, supersonic combustible mixtures
0360-3199
3222-3239
Cai, Xiaodong
293bf621-f0e1-48ba-abaa-b41da81ea244
Liang, Jianhan
fd8229b7-c7f4-4a1b-b94f-abce393f9e9a
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Che, Yonggang
2b2494f1-abab-4e3c-89af-63a85171be91
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
Che, Yonggang
2b2494f1-abab-4e3c-89af-63a85171be91
Lin, Zhiyong
ca704069-5f56-4689-8fde-4edb13622723

Cai, Xiaodong, Liang, Jianhan, Deiterding, Ralf, Che, Yonggang and Lin, Zhiyong (2016) Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model. International Journal of Hydrogen Energy, 41 (4), 3222-3239. (doi:10.1016/j.ijhydene.2015.11.093).

Record type: Article

Abstract

Detonation combustion initiated with a hot jet in supersonic H2-O2-Ar mixtures are investigated by large-scale three-dimensional (3D) simulations in Tianhe-2 computing system with adaptive mesh refinement method. The reactive Euler equations are utilized as the governing equations with a detailed reaction model where the molar ratio of the combustible mixture is 2:1:7 under the condition of pressure 10kPa and temperature 298K. Results show that the Mach stem surface which is formed after the shock surface reflection on the upper wall is actually a local overdriven detonation. The side walls in 3D simulations can play an important role in detonation initiation in supersonic combustible mixtures, because they can help realize triple lines collisions and reflections during the initiation process. The width of the channel has an important influence on the strength of side-wall reflections, and under certain condition there might exist a critical width between the front and back sides of the channel for the successful initiation. Both the two-dimensional (2D) and the 3D detonations are overdriven and have a constant but different overdrive after their complete initiations. Although the overdrive degree of the 3D detonation is smaller than that of the 2D case, more complex and irregular detonation fronts can be observed in the 3D case compared with the 2D detonation, which is likely because of the propagation of transverse waves and collisions of triple lines in multi-directions in 3D detonations. After the hot jet is shut down, the newly formed 2D Chapman-Jouguet (CJ) detonation has almost the same characteristic parameters with the corresponding 3D case, indicating that the 2D instabilities can be perfectly preserved in 3D simulations. However, the slapping wave reflections on the side walls in the 3D detonation result in the second oscillation along with the main one, which presents stronger instabilities compared with the 2D case. The inherent stronger 3D instabilities is also verified through the quantitative comparison between the 2D and 3D cases where the 3D result always shows stronger fluctuations than the 2D case.

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More information

Accepted/In Press date: 19 November 2015
e-pub ahead of print date: 24 December 2015
Published date: 30 January 2016
Keywords: initiation and propagation, three-dimensional detonation, adaptive mesh refinement, hot jet, supersonic combustible mixtures
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 384872
URI: https://eprints.soton.ac.uk/id/eprint/384872
ISSN: 0360-3199
PURE UUID: 318e6dd4-5873-434a-b797-267b557cfeff
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

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Date deposited: 13 Jan 2016 14:26
Last modified: 06 Jun 2018 12:20

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Contributors

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

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