TY - EJOU AU - Liu, Chong AU - Du, Yang AU - Liang, Jianjun AU - Meng, Hong AU - Wang, Jian AU - Zhang, Peili TI - Large Eddy Simulation of Gasoline-Air Mixture Explosion in Long Duct with Branch Structure T2 - Fluid Dynamics \& Materials Processing PY - 2020 VL - 16 IS - 3 SN - 1555-2578 AB - Gas explosion is a process involving complex hydrodynamics and chemical reactions. In order to investigate the interaction between the flame behavior and the dynamic overpressure resulting from the explosion of a premixed gasoline-air mixture in a confined space, a large eddy simulation (LES) strategy coupled with sub-grid combustion model has been implemented. The considered confined space consists of a long duct and four branches symmetrically distributed on both sides of the long duct. Comparisons between the simulated and experimental results have been considered with regard to the flame structure, flame speed and overpressure characteristics. It is shown that the explosion process can qualitatively be reproduced by the numerical simulation. Due to the branch structure, vortices are generated near the joint of the branch and long duct. Vortices rotate in opposite directions in the different branches. When the flame propagates into the branch, the flame front is influenced by the flow field structure and becomes more and more distorted. The overpressure displays a similar behavior in the two branches which have a different distance from the ignition point. It is finally shown that the overpressure change law can directly be put in relation with the shape of flame front. KW - Branch structure; large eddy simulation; premixed gasoline-air mixture explosion DO - 10.32604/fdmp.2020.09119