We numerically investigate the premixed flame acceleration (FA) and the subsequent deflagration to detonation transition (DDT) of pure and vitiated fuel/oxidizer mixtures in a microchannel under two extreme wall thermal conditions—an adiabatic wall and a hot, preheated isothermal wall. The numerical simulations are conducted using AMReX-Combustion PeleC, an exascale compressible reacting flow solver that leverages load-balanced block-structured adaptive mesh refinement to enable high-fidelity direct numerical simulation. We perform these simulations for a hydrogen combustion system. While it is widely known that adiabatic walls strongly promote the occurrence of DDT via FA, such a mechanism of DDT is found to be strongly limited by the flame speeds of the unreacted mixture and hence is intrinsically tied to the mixture composition. We demonstrate that the addition of water (i.e., vitiation) to the unreacted mixture leads to a significant reduction in the flame speed, thereby slowing down the FA process and subsequent DDT. With isothermal preheated walls, the pure fuel cases preferentially propagate along the wall after an auto-ignition event, leading to the formation of a “secondary” finger-flame. This secondary front subsequently undergoes transverse expansion, following which deceleration of the flame is observed. The vitiated fuel cases also exhibit a similar behavior, nonetheless exhibit much longer time-scales of auto-ignition and propagation, in addition to stronger deceleration. In summary, this study presents one of the very few simulations in the FA and DDT literature that employ detailed chemical kinetics for both adiabatic and isothermal walls.
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July 2023
Research Article|
July 06 2023
A numerical investigation of deflagration propagation and transition to detonation in a microchannel with detailed chemistry: Effects of thermal boundary conditions and vitiation
Special Collection:
Hydrogen Flame and Detonation Physics
Suryanarayan Ramachandran
;
Suryanarayan Ramachandran
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Mechanical Engineering, University of Minnesota–Twin Cities
, Minneapolis, Minnesota 55455, USA
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Navneeth Srinivasan
;
Navneeth Srinivasan
(Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Validation, Visualization, Writing – review & editing)
1
Department of Mechanical Engineering, University of Minnesota–Twin Cities
, Minneapolis, Minnesota 55455, USA
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Zhiyan Wang;
Zhiyan Wang
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Supervision, Writing – review & editing)
2
Process Innovation and Scale-Up Department, ExxonMobil Technology and Engineering Company
, Spring, Texas 77389, USA
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Arsam Behkish;
Arsam Behkish
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Supervision, Writing – review & editing)
3
Process Innovation and Scale-Up Department, ExxonMobil Technology and Engineering Company
, Annandale, New Jersey 08801, USA
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Suo Yang
Suo Yang
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Writing – review & editing)
1
Department of Mechanical Engineering, University of Minnesota–Twin Cities
, Minneapolis, Minnesota 55455, USA
a)Author to whom correspondence should be addressed: suo-yang@umn.edu
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a)Author to whom correspondence should be addressed: suo-yang@umn.edu
Note: This paper is part of the special topic, Hydrogen Flame and Detonation Physics.
Physics of Fluids 35, 076104 (2023)
Article history
Received:
April 22 2023
Accepted:
June 16 2023
Citation
Suryanarayan Ramachandran, Navneeth Srinivasan, Zhiyan Wang, Arsam Behkish, Suo Yang; A numerical investigation of deflagration propagation and transition to detonation in a microchannel with detailed chemistry: Effects of thermal boundary conditions and vitiation. Physics of Fluids 1 July 2023; 35 (7): 076104. https://doi.org/10.1063/5.0155645
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