Surface heat loss and chemical kinetic response in deflagration-to-detonation transition in microchannels

Han, Wenhu; Huang, Jin; Gu, Gongtian; Wang, Cheng; Law, Chung K.

doi:10.1103/physrevfluids.5.053201

Cited by 18 publications

(1 citation statement)

References 51 publications

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“…It indicated that shortly before the DDT occurs the shockwave is formed close to the flame leading tip and practically “sits” at the tip immediately. Han 14 studied the effect of surface heat loss on flame acceleration (FA) and DDT in a microscale channel by 2D numerical simulation, and found that the pressure wave would steepen into a strong shock promoted by the positive feedback between the pressure wave and the reaction. When the incident shock wave velocity is greater than a critical value, it will ignite the combustible gas by focusing in the reflectors 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation investigation of flame acceleration and deflagration to detonation transition of methane‐air mixture in rectangular channel

Zhao

Zhang²

2022

Engineering Reports

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Large eddy simulation is used to simulate flame acceleration and deflagration to detonation transition of methane-air mixtures in a small-scale 3D channel. The simulation results show the changing of the flame surface 3D structure in the stage of flame acceleration and deflagration to detonation transition. In the first stage, the flame velocity increases exponentially because of the expansion of combustion products and the wrinkle of flame surface. In the next stage, the interaction between flame and pressure wave makes flame accelerate continuously, and the acceleration rate of the flame velocity decreases first and then increases. As the pressure of the leading shock increases, the boundary layer is heated by the preheating area in front of the flame surface at the channel wall. Because the cross section of the channel is square, the ultrafast flame first appears in the boundary layer of the four inner edges between the channel wall, then it appears in the boundary layer on the channel wall. The ultrafast flame generates oblique shock waves continuously moving to the center of the channel and colliding with each other, which promote the occurrence of local explosion and the coupling of flame surface and leading shock wave.

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Section: Introductionmentioning

confidence: 99%