Turbulence, Vortex and External Explosion Induced by Venting

JIANG Xiao-hai; FAN Bao-chun; YE Jin-fang

Article Contents

Article Navigation > Applied Mathematics and Mechanics > 2004 > 25(12): 1271-1277

JIANG Xiao-hai, FAN Bao-chun, YE Jin-fang. Turbulence, Vortex and External Explosion Induced by Venting[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1271-1277.

Citation:

JIANG Xiao-hai, FAN Bao-chun, YE Jin-fang. Turbulence, Vortex and External Explosion Induced by Venting[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1271-1277.

Citation:

JIANG Xiao-hai, FAN Bao-chun, YE Jin-fang. Turbulence, Vortex and External Explosion Induced by Venting[J]. Applied Mathematics and Mechanics, 2004, 25(12): 1271-1277.

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Turbulence, Vortex and External Explosion Induced by Venting

College of Dynamics, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Received Date: 2003-01-13
Rev Recd Date: 2004-06-29
Publish Date: 2004-12-15

Abstract

Abstract

The process of explosion venting to air in a cylindrical vent vessel connected to a duct,filling with a stoichiometric methane-oxygen gas mixture,was simulated numerically by using a colocated grid SIMPLE scheme based on k-epsilon turbulent model and Eddy-dissipation combustion model. The characteristics of the combustible cloud,flame and pressure distribution in the external flow field during venting were analyzed in terms of the predicted results.The results show that the external explosion is generated due to violent turbulent combustion in the high pressure region within the external combustible cloud ignited by a jet flame.And the turbulence and vortex in the external flow field were also discussed in detail.After the jet flame penetrating into the external combustible cloud,the turbulent intensity is greater in the regions with greater average kinetic energy gradient,rather than in the flame front;and the vortex in the external flow field is generated primarily due to the baroclinic effect,which is greater in the regions where the pressure and density gradients are nearly perpendicular.
- explosion,
- vented explosion,
- external explosion

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References(7)

References

[1]	Mccann D P J, Thomas G O, Edwards D H. Gasdynamics of vented explosions—Part I:Experimental studies[J].Combustion and Flame,1985,59(3):233—250. doi: 10.1016/0010-2180(85)90128-2
[2]	Cooper M G, Fairweather M, Tite J P. On the mechanisms of pressure generation in vented explosions[J].Combustion and Flame,1986,65(1):1—14. doi: 10.1016/0010-2180(86)90067-2
[3]	Ponizy B, Leyer J C. Flame dynamics in a vented vessel connected to a duct—1:Mechanism of vessel-duct interaction[J].Combustion and Flame,1999,116(2):259—271. doi: 10.1016/S0010-2180(98)00038-8
[4]	Catlin C A. Scale effects on the external combustion caused by venting of a confined explosion[J].Combustion and Flame,1991,83(4):399—411. doi: 10.1016/0010-2180(91)90086-Q
[5]	Hjertager B H. Simulation of transient compressible turbulent reactive flows[J].Combustion Science and Technology,1982,27(5):159—170. doi: 10.1080/00102208208946985
[6]	陶文铨.计算传热学的近代进展[M].北京:科学出版社,2000,181—186.
[7]	王继海.二维非定常流和激波[M].北京:科学出版社,1994,348—383.