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Three-dimensional detonation structures and effects of thermal confinement in a linear channel

Zhaoxin Ren Orcid Logo, Jac Clarke

Proceedings of the Combustion Institute, Volume: 41, Start page: 105873

Swansea University Authors: Zhaoxin Ren Orcid Logo, Jac Clarke

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DOI (Published version): 10.1016/j.proci.2025.105873

Abstract

This study employs three-dimensional (3D) numerical simulations to investigate the detonation wave propagation in an unwrapped annular combustor configuration, focusing on thermal confinement effects on detonation structures and blast dynamics. The compressible Navier-Stokes equations are solved for...

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Published in: Proceedings of the Combustion Institute
ISSN: 1540-7489
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa70525
first_indexed 2025-09-29T10:58:36Z
last_indexed 2025-09-30T08:56:59Z
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spelling 2025-09-29T12:06:57.5184038 v2 70525 2025-09-29 Three-dimensional detonation structures and effects of thermal confinement in a linear channel 62a1a0da0fa78e05c3deafcdee5551ce 0000-0002-6305-9515 Zhaoxin Ren Zhaoxin Ren true false e1479e5768c270417e8a2cb734295626 Jac Clarke Jac Clarke true false 2025-09-29 ACEM This study employs three-dimensional (3D) numerical simulations to investigate the detonation wave propagation in an unwrapped annular combustor configuration, focusing on thermal confinement effects on detonation structures and blast dynamics. The compressible Navier-Stokes equations are solved for stoichiometric kerosene-air mixtures under three distinct wall boundary conditions: (1) adiabatic (uncooled), (2) isothermal at 300 K (representing actively cooled walls), and (3) hybrid adiabatic-isothermal configurations. Results reveal that wall temperature critically governs detonation morphology: adiabatic boundaries produce regular cellular structures via ‘multi-kernel’ formation (intersections of four transverse waves), while cooled walls (300 K) generate stripe-like ‘line-kernel’ (formed through two-wave intersections), accompanied by double-wave structures, increased pressure fluctuations, and unburned fuel pockets. The hybrid case demonstrates asymmetric detonation development, with stable propagation on the adiabatic side contrasting with elongated cells and intensified wave-wall interactions on the cooled side. Quantitative analysis shows that cooled boundaries reduce the detonation wave height compared to adiabatic cases and promote irregular cell sizes due to suppressed boundary layer reactions. These findings present the first systematic evidence of 3D thermal confinement effects on RDW dynamics, revealing a critical trade-off in combustor design: while lower wall temperatures enhance material durability, they compromise combustion efficiency through increased flow unsteadiness and incomplete fuel consumption. The study advances the fundamental understanding of detonation physics in practical thermal gradients and provides actionable insights for optimizing cooling strategies in rotating detonation engines. Journal Article Proceedings of the Combustion Institute 41 105873 Elsevier BV 1540-7489 Rotating detonation; Thermal confinement effects; Three-dimensional structures; Kerosene-air combustion 27 9 2025 2025-09-27 10.1016/j.proci.2025.105873 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University SU Library paid the OA fee (TA Institutional Deal) 2025-09-29T12:06:57.5184038 2025-09-29T11:56:10.2016541 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Zhaoxin Ren 0000-0002-6305-9515 1 Jac Clarke 2 70525__35190__4696611a3f8d4180913945101061843d.pdf 70525.VoR.pdf 2025-09-29T11:59:42.2823151 Output 7887130 application/pdf Version of Record true This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Three-dimensional detonation structures and effects of thermal confinement in a linear channel
spellingShingle Three-dimensional detonation structures and effects of thermal confinement in a linear channel
Zhaoxin Ren
Jac Clarke
title_short Three-dimensional detonation structures and effects of thermal confinement in a linear channel
title_full Three-dimensional detonation structures and effects of thermal confinement in a linear channel
title_fullStr Three-dimensional detonation structures and effects of thermal confinement in a linear channel
title_full_unstemmed Three-dimensional detonation structures and effects of thermal confinement in a linear channel
title_sort Three-dimensional detonation structures and effects of thermal confinement in a linear channel
author_id_str_mv 62a1a0da0fa78e05c3deafcdee5551ce
e1479e5768c270417e8a2cb734295626
author_id_fullname_str_mv 62a1a0da0fa78e05c3deafcdee5551ce_***_Zhaoxin Ren
e1479e5768c270417e8a2cb734295626_***_Jac Clarke
author Zhaoxin Ren
Jac Clarke
author2 Zhaoxin Ren
Jac Clarke
format Journal article
container_title Proceedings of the Combustion Institute
container_volume 41
container_start_page 105873
publishDate 2025
institution Swansea University
issn 1540-7489
doi_str_mv 10.1016/j.proci.2025.105873
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
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description This study employs three-dimensional (3D) numerical simulations to investigate the detonation wave propagation in an unwrapped annular combustor configuration, focusing on thermal confinement effects on detonation structures and blast dynamics. The compressible Navier-Stokes equations are solved for stoichiometric kerosene-air mixtures under three distinct wall boundary conditions: (1) adiabatic (uncooled), (2) isothermal at 300 K (representing actively cooled walls), and (3) hybrid adiabatic-isothermal configurations. Results reveal that wall temperature critically governs detonation morphology: adiabatic boundaries produce regular cellular structures via ‘multi-kernel’ formation (intersections of four transverse waves), while cooled walls (300 K) generate stripe-like ‘line-kernel’ (formed through two-wave intersections), accompanied by double-wave structures, increased pressure fluctuations, and unburned fuel pockets. The hybrid case demonstrates asymmetric detonation development, with stable propagation on the adiabatic side contrasting with elongated cells and intensified wave-wall interactions on the cooled side. Quantitative analysis shows that cooled boundaries reduce the detonation wave height compared to adiabatic cases and promote irregular cell sizes due to suppressed boundary layer reactions. These findings present the first systematic evidence of 3D thermal confinement effects on RDW dynamics, revealing a critical trade-off in combustor design: while lower wall temperatures enhance material durability, they compromise combustion efficiency through increased flow unsteadiness and incomplete fuel consumption. The study advances the fundamental understanding of detonation physics in practical thermal gradients and provides actionable insights for optimizing cooling strategies in rotating detonation engines.
published_date 2025-09-27T14:18:51Z
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