Large eddy simulation of impacted obstacles' effects on premixed flame's characteristics

被引：0
|
作者：
Wang G. [1 ,2 ]
Zhang J. [2 ]
Li D. [2 ]
Chen X. [2 ]
机构：
[1] School of Safety Engineering, Henan Institute of Engineering, Zhengzhou, 451191, Henan
[2] Department of Safety Science and Engineering, Wuhan University of Technology, Wuhan, 430070, Hubei
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2017年 / 37卷 / 01期
关键词：
Large eddy simulation; Mechanics of explosion; Obstacles; Premixed flame; Thickened flame model;
D O I：
10.11883/1001-1455(2017)01-0068-09
中图分类号：
学科分类号：
摘要：
In the process of the premixed gas flame propagation, obstacles have vital influence on the flame's structure and propagation, and will enhance the flame acceleration and the DDT process. Through the methane/air premixed flame propagation experiment with obstacles in the visual pipe, the flame microstructure changes and the propagation characteristics were captured. By means of the three-dimensional physical model, a large eddy simulation mode (LES) with the WALE sub-grid scale models, and the thickened flame model (TFM) were used to repeat experiment process. The complex changes of the flow field were obtained when the premixed flame climbed over the obstacle, and the characteristics of the flow turbulence transition were analyzed. Finally, the direct cause of the premixed flame disturbance instability under the influence of the obstacles was revealed. It was induced by the coupling effect of the Kelvin-Helmholtz instability and the Rayleigh-Taylor instability, which in turn was affected by three vortexes as a result of the obstacle. © 2017, Editorial Board of EXPLOSION AND SHOCK WAVES. All right reserved.
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页码：68 / 76
页数：8
相关论文
共 11 条
  • [1] Ciccarelli G., Johansen C., Kellenberger M., High-speed flames and DDT in very rough-walled channels, Combustion and Flame, 160, 1, pp. 204-211, (2013)
  • [2] Chen X., Zhang Y., Zhang Y., Effect of CH<sub>4</sub>-Air ratios on gas explosion flame microstructure and propagation behaviors, Energies, 5, 10, pp. 4132-4146, (2012)
  • [3] Sklavounos S., Rigas F., Validation of turbulence models in heavy gas dispersion over obstacles, Journal of Hazardous Materials, 108, 1, pp. 9-20, (2004)
  • [4] Arntzen B.J., Modelling of turbulence and combustion for simulation of gas explosions in complex geometries, Journal of Loss Prevention in the Process Industries, 18, 4-6, pp. 225-237, (1998)
  • [5] Sarli V.D., Benedetto A.D., Long E.J., Et al., Time-resolved particle image velocimetry of dynamic interactions between hydrogen-enriched methane/air premixed flames and toroidal vortex structures, International Journal of Hydrogen Energy, 37, 21, pp. 16201-16213, (2012)
  • [6] Masri A.R., Ibrahim S.S., Cadwallader B.J., Measurements and large eddy simulation of propagating premixed flames, Experimental Thermal and Fluid Science, 30, 7, pp. 687-702, (2006)
  • [7] Gubba S.R., Ibrahim S.S., Malalasekera W., Et al., Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles, Combustion and Flame, 158, 12, pp. 2465-2481, (2011)
  • [8] Kessler D.A., Gamezo V.N., Oran E.S., Simulations of flame acceleration and deflagration-to-detonation transitions in methane-air systems, Combustion and Flame, 157, 11, pp. 2063-2077, (2010)
  • [9] Gamezo V.N., Ogawa T., Oran E.S., Flame acceleration and DDT in channels with obstacles: Effect of obstacle spacing, Combustion and Flame, 155, 1-2, pp. 302-315, (2008)
  • [10] Ogawa T., Gamezo V.N., Oran E.S., Flame acceleration and transition to detonation in an array of square obstacles, Journal of Loss Prevention in the Process Industries, 26, 2, pp. 355-362, (2013)
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