Numerical simulation of methane-air explosion flame in a long closed vessel

作者：Bi Ming Shu^*; Dong Cheng Jie; Zhou Yi Hui

来源：Journal of China Coal Society, 2012, 37(1): 127-131.

• Closed vessels
• Flame propagation
• Flame speed
• Gas explosions
• Inner diameters
• Large L/D closed vessel
• Methane-air
• Middle section
• Near-wall
• Numerical results
• Premixed combustion
• Turbulence modeling

A numerical model was built and a series of numerical simulations of methane-air explosions were carried out in a long closed pipe which was 104 mm in inner diameter and 2400 mm in length. The model was based on the large eddy simulation for turbulence modeling and the premixed combustion for calculating chemical reaction. The simulated pressures and total explosion time were in good agreement with experimental results. It is found that, after ignition, flame darts forward firstly, then the flame speed decreases sharply. Tulip flame appears during explosion and its formation is related to the interaction of vortices in the middle section and near walls. The vortices near walls moves backward after tulip flame, which is an important factor to the transform from laminar to turbulence combustion. The numerical results reveal the characteristics of flame propagation and flow field during gas explosion in such pipe.

• 出版日期2012