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Updated: Oct 15, 2025

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
Published on: June 1, 2016
Large Eddy Simulation of Premixed CH4/Air Deflagration in a Duct with Obstacles at Different Heights
Qingling Dai1, Shengbo Zhang1, Shiwei Zhang1
1School of Mechanical and Intelligent Manufacturing, Jiu Jiang University, Jiujiang, Jiangxi 332005, China.
Abstract:
In this work, the propagation of CH4/air deflagration flames in three semi-confined ducts with different obstacles was numerically investigated using large eddy simulation (LES). The shape of the premixed flame, flow field structure, and overpressure characteristics of the interaction between the flame and the obstacle are simulated accurately in three ducts with obstacles of different heights. The results show that the structure of the flame is changed by the presence of obstacles, and a change in the shape of the hemispherical conical brush appears, and a flame vortex is generated by the entrapment of unburned premixed gas on the left side of the obstacles. In the process of CH4/air deflagration, the existence of obstacles would lead to the change in combustion velocity and overpressure relief velocity and then have a certain influence on the peak of overpressure and the shape of the premixed flame.
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