Wang Gongzhong, Zhang Jianhua, Li Dengke, Chen Xianfeng. Large eddy simulation of impacted obstacles' effects on premixed flame's characteristics[J]. Explosion And Shock Waves, 2017, 37(1): 68-76. doi: 10.11883/1001-1455(2017)01-0068-09
Citation:
Wang Gongzhong, Zhang Jianhua, Li Dengke, Chen Xianfeng. Large eddy simulation of impacted obstacles' effects on premixed flame's characteristics[J]. Explosion And Shock Waves, 2017, 37(1): 68-76. doi: 10.11883/1001-1455(2017)01-0068-09
Wang Gongzhong, Zhang Jianhua, Li Dengke, Chen Xianfeng. Large eddy simulation of impacted obstacles' effects on premixed flame's characteristics[J]. Explosion And Shock Waves, 2017, 37(1): 68-76. doi: 10.11883/1001-1455(2017)01-0068-09
Citation:
Wang Gongzhong, Zhang Jianhua, Li Dengke, Chen Xianfeng. Large eddy simulation of impacted obstacles' effects on premixed flame's characteristics[J]. Explosion And Shock Waves, 2017, 37(1): 68-76. doi: 10.11883/1001-1455(2017)01-0068-09
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.
Ciccarelli G, Johansen C, Kellenberger M.High-speed flames and DDT in very rough-walled channels[J].Combustion and Flame, 2013, 160(1):204-211. doi: 10.1016/j.combustflame.2012.08.009
[2]
Chen Xianfeng, Zhang Yin, Zhang Ying.Effect of CH4-Air ratios on gas explosion flame microstructure and propagation behaviors[J].Energies, 2012, 5(10):4132-4146. doi: 10.3390/en5104132
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[J].International Journal of Hydrogen Energy, 2012, 37(21):16201-16213. doi: 10.1016/j.ijhydene.2012.08.061
[6]
Masri A R, Ibrahim S S, Cadwallader B J.Measurements and large eddy simulation of propagating premixed flames[J].Experimental Thermal and Fluid Science, 2006, 30(7):687-702. doi: 10.1016/j.expthermflusci.2006.01.008
[7]
Gubba S R, Ibrahim S S, Malalasekera W, et al.Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles[J].Combustion and Flame, 2011, 158(12):2465-2481. doi: 10.1016/j.combustflame.2011.05.008
[8]
Kessler D A, Gamezo V N, Oran E S.Simulations of flame acceleration and deflagration-to-detonation transitions in methane-air systems[J].Combustion and Flame, 2010, 157(11):2063-2077. doi: 10.1016/j.combustflame.2010.04.011
Ogawa T, Gamezo V N, Oran E S.Flame acceleration and transition to detonation in an array of square obstacles[J].Journal of Loss Prevention in the Process Industries, 2013, 26(2):355-362. doi: 10.1016/j.jlp.2011.12.009
DownLoad:
