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LES investigation of flame acceleration and DDT of methane-air mixture in rectangular channel
  • yongyao zhao,
  • yanmin zhang
yongyao zhao
Jinzhong University

Corresponding Author:zhaoyongyao555@163.com

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yanmin zhang
Shanxi Vocational University of Engineering Science and Technology
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Large eddy simulation (LES) is used to simulate flame acceleration (FA) and deflagration to detonation transition (DDT) of methane–air mixtures in a small-scale 3D channel. The simulation results show that, in the early stages, 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 which causes the ultrafast flame propagates in the boundary layer. 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.
02 Jun 2022Submitted to Engineering Reports
14 Jun 2022Submission Checks Completed
14 Jun 2022Assigned to Editor
17 Jun 2022Reviewer(s) Assigned
17 Aug 2022Editorial Decision: Revise Major
23 Aug 20221st Revision Received
23 Aug 2022Submission Checks Completed
23 Aug 2022Assigned to Editor
23 Aug 2022Reviewer(s) Assigned
25 Aug 2022Editorial Decision: Revise Minor
25 Aug 20222nd Revision Received
26 Aug 2022Submission Checks Completed
26 Aug 2022Assigned to Editor
29 Aug 2022Editorial Decision: Accept