Smoke Propagation in an Inclined Semi-Circular Long Tunnel

Abstract:

This work used FDS to simulate tunnel fires occur in a semi-circular longitudinally ventilated tunnel. By varying the parameters such as the tunnel gradient, the fire size, and the ventilation velocity, their influence on the backlayering effect and downstream propagation rate can be recognized. Under weak ventilation, the backlayering effect either advances or vanishes depending on the slope of the tunnel. Under stronger ventilation, the backlayering effect would break up. The temperature distributions may become less and less dependent on the tunnel gradient when the ventilation velocity is increased. Although the hot gases and smoke in uphill tunnels propagate faster than those in downhill tunnels, their difference reduces with ventilation velocity.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 2143-2148
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.2143
• Online since: January 2012
• Authors: Jik Chang Leong, C.L. Chang, Y. C. Chen, L.W. Chen
• Keywords: Backlayering Effect, FDS, Semi-Circular Longitudinally Ventilated Tunnel, Smoke Propagation Rate

References

[1] R. Friedman, An International Survey of Computer Models for Fire and Smoke, J. Fire Prot. Eng. 4 (1992) 81-92.

[2] S.M. Olenick, D.J. Carpenter, An Updated International Survey of Computer Models for Fire and Smoke, J. Fire Prot. Eng. 13 (2003) 87-110.

DOI: 10.1177/1042391503013002001

[3] C.C. Hwang, R.F. Chaiken, J.M. Singer, D.N.H. Chi, Reverse Stratified Flow in Duct Fires: A Two-Dimensional Approach, 16th Symposium on Combustion (1977) 1385-1395.

DOI: 10.1016/s0082-0784(77)80423-2

[4] N.C. Markatos, M.R. Malin, G. Cox, Mathematical Modelling of Buoyancy-Induced Smoke Flow in Enclosures, Int. J. Heat Mass Transf. 25 (1982) 63-75.

DOI: 10.1016/0017-9310(82)90235-6

[5] S. Kumar, G. Cox, Radiant Heat and Surface Roughness Effects in the Numerical Modeling of Tunnel Fires, 6th Int. Symp. on Aerodynamics and Ventilation of Vehicle Tunnels, BMRA, 1998.

[6] S. Kotoh, G. Yamanaka, Air Flow Analyses in a Longitudinally Ventilated Road Tunnel on a Fire, ASME/JSME Thermal Engineering Proceedings 5 (1991) 347-354.

[7] H. Xue, E. Hihara, T. Saito, Turbulence Model of Fire-Induced Air Flow in a Ventilated Tunnel, Int. J. Heat Mass Transf. 36 (1993) 1739-1748.

DOI: 10.1016/s0017-9310(05)80160-7

[8] H. Xue, T.C. Chew, H.F. Cheong, Transient Three-Dimensional Fire-Induced Airflow in a Full Scale Ventilated Tunnel, Combust. Sci. Technol. 105 (1995) 117-129.

DOI: 10.1080/00102209508907742

[9] Y. Wu, M.Z.A. Bakar, Control of Smoke Flow in Tunnel Fires Using Longitudinal Ventilation Systems - a Study of the Critical Velocity, Fire Saf. J. 35 (2000) 363-390.

DOI: 10.1016/s0379-7112(00)00031-x

[10] P.J. Woodburn, R.E. Britter, CFD Simulations of a Tunnel Fire – Part II, Fire Saf. J. 26 (1996) 63-90.

DOI: 10.1016/0379-7112(96)00019-7

[11] S.R. Lee, H.S. Ryou, A numerical study on smoke movement in longitudinal ventilation tunnel fires for different aspect ratio, Build. Environ. 41 (2006) 719-725.

DOI: 10.1016/j.buildenv.2005.03.010

[12] L.H. Hu, R. Huo, H.B. Wang, R.X. Yang, Experimental and numerical studies on longitudinal smoke temperature distribution upstream and downstream from the fire in a road tunnel, J. Fire Sci. 25 (2007) 23-43.

DOI: 10.1177/0734904107062357

[13] R.G. Rehm, H.R. Baum, The Equations of Motion of Thermally Driven Buoyant Flows, J. Res. Natl. Inst. Stand. Technol. 83 (1978) 297-308.

DOI: 10.6028/jres.083.019

[14] K.B.McGrattan, H.R. Baum, R.G. Rehm, Large Eddy Simulation of Smoke Movement, Fire Saf. J. 30 (1998) 161-178.

DOI: 10.1016/s0379-7112(97)00041-6

[15] J. Smagorinsky, General Circulation Experiments with the Primitive Equations. I. The basic experiment, Mon. Weather Rev. 91 (1963) 99-164.

DOI: 10.1175/1520-0493(1963)091<0099:gcewtp>2.3.co;2

[16] J.E. Floyd, K.B. McGrattan, S. Hostikka, H.R. Baum, CFD Fire Simulation Using Mixture Fraction Combustion and Finite Volume Radiative Heat Transfer, J. Fire Prot. Eng. 13 (2003) 11-36.

DOI: 10.1177/1042391503013001002