Impacts of Rectangular Obstacle Lengths on Premixed Methane-Air Flame Propagation in a Closed Tube
G. Luo1, J.-Q. Tu1, Y.-L. Qian1, K.-K. Jin1, T.-J. Ye2, Y. Bai3, S. Gao1
1Zhejiang College of Security Technology, Zhejiang, 325016 China
2Wenzhou Vocational College of Science and Technology, Zhejiang, 325006 China
3Oujiang College, Wenzhou University, Zhejiang, 325035 China
Keywords: Methane-air flame, OpenFOAM, obstacle length, flame-vortex interaction, flame acceleration
Abstract
To investigate the mechanism of the flame-vortex interaction induced by an obstacle, a numerical research of premixed methane-air flame dynamics in an obstructed chamber is described. Numerical simulations are performed with the OpenFOAM open-source CFD code. The simulation images show that the flame propagation process can be divided into four typical stages. A series of instabilities are captured in the simulation during flame propagation. More importantly, the numerical results demonstrate that a longer obstacle allows a sufficient accelerating time, which can give rise to a higher explosion overpressure and faster flame tip speed.
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