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Research Article

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

W.P. Fan1, Y. Gao1, Y.M. Zhang2, C.L. Chow3, Wan-ki Chow4( )
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, Heilongjiang, China
Hangzhou Steam Turbine & Power Group Co., Ltd Hangzhou, Zhejiang, China
Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China
Research Centre for Fire Engineering, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
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Abstract

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.

Keywords

large eddy simulationdeflagrationflame propagationflow field characteristics

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Building Simulation
Volume 13 Issue 4,
August 2020
Pages 849-864
DOI: 10.1007/s12273-020-0618-1
Cite this article:
Fan W, Gao Y, Zhang Y, et al. Numerical studies on turbulent flame propagation in premixed gas deflagration inside a tube. Building Simulation, 2020, 13(4): 849-864. https://doi.org/10.1007/s12273-020-0618-1

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Received: 25 March 2019
Accepted: 12 February 2020
Published: 14 April 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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