Numerical studies on turbulent flame propagation in premixed gas deflagration inside a tube

被引：0
作者：
W. P. Fan
Y. Gao
Y. M. Zhang
C. L. Chow
Wan-ki Chow
机构：
[1] Harbin Engineering University,College of Aerospace and Civil Engineering
[2] Hangzhou Steam Turbine & Power Group Co.,Department of Architecture and Civil Engineering
[3] Ltd,Research Centre for Fire Engineering, Department of Building Services Engineering
[4] City University of Hong Kong,undefined
[5] The Hong Kong Polytechnic University,undefined
来源：
Building Simulation | 2020年 / 13卷
关键词：
large eddy simulation; deflagration; flame propagation; flow field characteristics;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Numerical simulation on turbulent flame propagation in premixed gas deflagration process in a tube will be reported in this paper, aiming at identifying the key factors affecting flame shape and flame velocity. Large eddy simulation with premixed gas combustion model is used to obtain results validated by full-scale experimental data. The effect of flow velocity and turbulence on flame propagation is discussed. The flow velocity of premixed gas is observed to be one of the main factors determining flame shape and affecting flame propagation process. The velocity difference of different parts of the flame front, both in magnitude and direction, will lead to tulip-shaped flame. Turbulence would accelerate the propagation of flame periodically. The cause of flame acceleration of low-intensity turbulence originates from two factors, namely, combustion and flow field, which transfer the heat and mass of chemical reaction from diffusion to vortex transport. As high-intensity turbulence will not affect the chemical reaction and the turbulent burning velocity, flame acceleration is controlled only by the characteristics of the flow field.
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页码：849 / 864
页数：15
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