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Propagation of gaseous detonation across inert layers

Propagation of gaseous detonation across inert layers
Propagation of gaseous detonation across inert layers
In rotating detonation engines and explosion accidents, detonation may propagate in an inhomogeneous mixture with inert layers. This study focuses on detonation propagation in a stoichiometric H2/O2/N2 mixture with multiple inert layers normal to the detonation propagation direction. One- and two-dimensional simulations considering detailed chemistry are conducted. The emphasis is placed on assessing the effects of inert layer on detonation reinitiation/failure, detonation propagation speed, detonation cell structure and cell size. Specifically, the inert layer thickness and the spacing between two consecutive inert layers are varied. Either detonation reinitiation or failure across the inert layers is observed. It is found that successful detonation reinitiation occurs only at relatively small values of the inert layer thickness and spacing. For each given value of the inert layer spacing, there is a critical inert layer thickness above which detonation fails after crossing the inert layers. This critical inert layer thickness is found to decrease as the inert layer spacing increases. The detailed process of detonation reinitiation across the inert layers is analyzed. The interaction between the transverse shock waves is shown to induce local autoignition/explosion and eventually overdriven detonation development in the reactive layer. The averaged detonation propagation speed in the inhomogeneous mixture is compared to the CJ speed and very good agreement is achieved. This indicates that the inert layer does not affect the detonation propagation speed once successful detonation reinitiation happens. Unlike the detonation speed, the detonation cell structure and cell size are greatly affected by the inert layer results. For the first time, large cellular structure with size linearly proportional to the inert layer spacing is observed for detonation propagation across inert layers. Besides, a double cellular structure is observed for relatively large spacing between inert layers. The formation of double cellular structure is interpreted.
Cell structure, Detonation propagation, Inert layer, Inhomogeneous mixture
1540-7489
3555-3563
Wang, Yuan
55cbf3f2-22b6-4c0f-a9dc-351a288d9469
Huang, Chengyang
bf4425e8-c7a9-4b8f-ae7f-956a81fe2a17
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Chen, Haitao
f3733fde-97d5-40fb-9a5a-66cd9f02e4ef
Chen, Zheng
d07c1910-ab71-4efe-8c09-cd6adea14404
Wang, Yuan
55cbf3f2-22b6-4c0f-a9dc-351a288d9469
Huang, Chengyang
bf4425e8-c7a9-4b8f-ae7f-956a81fe2a17
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Chen, Haitao
f3733fde-97d5-40fb-9a5a-66cd9f02e4ef
Chen, Zheng
d07c1910-ab71-4efe-8c09-cd6adea14404

Wang, Yuan, Huang, Chengyang, Deiterding, Ralf, Chen, Haitao and Chen, Zheng (2020) Propagation of gaseous detonation across inert layers. Proceedings of the Combustion Institute, 38, 3555-3563. (doi:10.1016/j.proci.2020.07.022).

Record type: Article

Abstract

In rotating detonation engines and explosion accidents, detonation may propagate in an inhomogeneous mixture with inert layers. This study focuses on detonation propagation in a stoichiometric H2/O2/N2 mixture with multiple inert layers normal to the detonation propagation direction. One- and two-dimensional simulations considering detailed chemistry are conducted. The emphasis is placed on assessing the effects of inert layer on detonation reinitiation/failure, detonation propagation speed, detonation cell structure and cell size. Specifically, the inert layer thickness and the spacing between two consecutive inert layers are varied. Either detonation reinitiation or failure across the inert layers is observed. It is found that successful detonation reinitiation occurs only at relatively small values of the inert layer thickness and spacing. For each given value of the inert layer spacing, there is a critical inert layer thickness above which detonation fails after crossing the inert layers. This critical inert layer thickness is found to decrease as the inert layer spacing increases. The detailed process of detonation reinitiation across the inert layers is analyzed. The interaction between the transverse shock waves is shown to induce local autoignition/explosion and eventually overdriven detonation development in the reactive layer. The averaged detonation propagation speed in the inhomogeneous mixture is compared to the CJ speed and very good agreement is achieved. This indicates that the inert layer does not affect the detonation propagation speed once successful detonation reinitiation happens. Unlike the detonation speed, the detonation cell structure and cell size are greatly affected by the inert layer results. For the first time, large cellular structure with size linearly proportional to the inert layer spacing is observed for detonation propagation across inert layers. Besides, a double cellular structure is observed for relatively large spacing between inert layers. The formation of double cellular structure is interpreted.

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Restricted to Repository staff only until 16 July 2022.
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Accepted/In Press date: 16 July 2020
e-pub ahead of print date: 23 August 2020
Published date: 23 August 2020
Keywords: Cell structure, Detonation propagation, Inert layer, Inhomogeneous mixture

Identifiers

Local EPrints ID: 442792
URI: http://eprints.soton.ac.uk/id/eprint/442792
ISSN: 1540-7489
PURE UUID: bb356921-2fa8-4927-b106-7f1b92e54ccc
ORCID for Ralf Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

Catalogue record

Date deposited: 27 Jul 2020 16:31
Last modified: 28 Apr 2022 02:13

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Contributors

Author: Yuan Wang
Author: Chengyang Huang
Author: Ralf Deiterding ORCID iD
Author: Haitao Chen
Author: Zheng Chen

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