Detonation simulations in supersonic flow under circumstances of injection and mixing
Detonation simulations in supersonic flow under circumstances of injection and mixing
The unsteady, reactive Navier-Stokes equations with a detailed chemical mechanism of 11 species and 27 steps were employed to simulate the mixing, flame acceleration and deflagration to detonation transition (DDT) triggered by transverse jet obstacles. Results show that multiple transverse jet obstacles ejecting into the chamber can be used to activate DDT. But the occurrence of DDT is tremendously difficult in a supersonic non-uniform mixture so that it required several groups of transverse jets with increasing stagnation pressure. The jets introduce flow turbulence and produce oblique and bow shock waves even in an inhomogeneous supersonic mixture. The DDT is enhanced by multiple explosion points that are generated by the intense shock wave focusing of the leading flame front. It is found that the partial detonation front decouples into shock and flame, which is mainly caused by the fuel deficiency, nevertheless the decoupled shock wave is strong enough to reignite the mixture to detonation conditions. The resulting transverse wave leads to further mixing and burning of the downstream non-equilibrium chemical reaction, resulting in a high combustion temperature and intense flow instabilities. Additionally, the axial and transverse gradients of the supersonic non-uniform mixture induce a highly dynamic behavior with sudden propagation speed increase and detonation front instabilities.
Deflagration-to-detonation transition, Detonation propagation, Flame acceleration, Non-uniform supersonic mixture
2895-2903
Zhao, Wandong
d9c8a7b9-8e16-4e9e-9c18-d5ee83d1d979
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Jiang, Liang
039743e1-94f5-497f-a7c8-c67d1bd0ac15
Cai, Xiaodong
293bf621-f0e1-48ba-abaa-b41da81ea244
Wang, Xinxin
faafb881-5948-40d5-b2bb-df56f6687c32
7 June 2023
Zhao, Wandong
d9c8a7b9-8e16-4e9e-9c18-d5ee83d1d979
Deiterding, Ralf
ce02244b-6651-47e3-8325-2c0a0c9c6314
Jiang, Liang
039743e1-94f5-497f-a7c8-c67d1bd0ac15
Cai, Xiaodong
293bf621-f0e1-48ba-abaa-b41da81ea244
Wang, Xinxin
faafb881-5948-40d5-b2bb-df56f6687c32
Zhao, Wandong, Deiterding, Ralf, Jiang, Liang, Cai, Xiaodong and Wang, Xinxin
(2023)
Detonation simulations in supersonic flow under circumstances of injection and mixing.
Proceedings of the Combustion Institute, 39 (3), .
(doi:10.1016/j.proci.2022.08.111).
Abstract
The unsteady, reactive Navier-Stokes equations with a detailed chemical mechanism of 11 species and 27 steps were employed to simulate the mixing, flame acceleration and deflagration to detonation transition (DDT) triggered by transverse jet obstacles. Results show that multiple transverse jet obstacles ejecting into the chamber can be used to activate DDT. But the occurrence of DDT is tremendously difficult in a supersonic non-uniform mixture so that it required several groups of transverse jets with increasing stagnation pressure. The jets introduce flow turbulence and produce oblique and bow shock waves even in an inhomogeneous supersonic mixture. The DDT is enhanced by multiple explosion points that are generated by the intense shock wave focusing of the leading flame front. It is found that the partial detonation front decouples into shock and flame, which is mainly caused by the fuel deficiency, nevertheless the decoupled shock wave is strong enough to reignite the mixture to detonation conditions. The resulting transverse wave leads to further mixing and burning of the downstream non-equilibrium chemical reaction, resulting in a high combustion temperature and intense flow instabilities. Additionally, the axial and transverse gradients of the supersonic non-uniform mixture induce a highly dynamic behavior with sudden propagation speed increase and detonation front instabilities.
Text
PCI-revised-detonation in supersonic non-uniform mixture-abb-4-RD
- Accepted Manuscript
More information
Accepted/In Press date: 25 August 2022
e-pub ahead of print date: 16 November 2022
Published date: 7 June 2023
Additional Information:
Funding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 11925207 and 91741205 ) and the China Scholarship Council (No. 202106110005 ).
Publisher Copyright:
© 2022
Keywords:
Deflagration-to-detonation transition, Detonation propagation, Flame acceleration, Non-uniform supersonic mixture
Identifiers
Local EPrints ID: 470543
URI: http://eprints.soton.ac.uk/id/eprint/470543
ISSN: 1540-7489
PURE UUID: b61c0d52-845f-4818-8c28-5be62226b4e3
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Date deposited: 12 Oct 2022 16:47
Last modified: 17 Mar 2024 07:31
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Contributors
Author:
Wandong Zhao
Author:
Liang Jiang
Author:
Xiaodong Cai
Author:
Xinxin Wang
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