Numerical Simulations of Fire in Typical Air Conditioned Railway Coach

Railways in India remain primary mode of transport
having one of the largest networks in the world and catering to
billions of transits yearly. Catastrophic economic damage and loss
to life is encountered over the past few decades due to fire to
locomotives. Study of fire dynamics and fire propagation plays an
important role in evacuation planning and reducing losses. Simulation
based study of propagation of fire and soot inside an air conditioned
coach of Indian locomotive is done in this paper. Finite difference
based solver, Fire Dynamic Simulator (FDS) version 6 has been
used for analysis. A single air conditioned 3 tier coupe closed to
ambient surroundings by glass windows having occupancy for 8
people is the basic unit of the domain. A system of three such
coupes combined is taken to be fundamental unit for the entire
study to resemble effect to an entire coach. Analysis of flame and
soot contours and concentrations is done corresponding to variations
in heat release rate per unit volume (HRRPUA) of fire source,
variations in conditioned air velocity being circulated inside coupes
by vents and an alternate fire initiation and propagation mechanism
via ducts. Quantitative results of fractional area in top and front
view of the three coupes under fire and smoke are obtained using
MATLAB (IMT). Present simulations and its findings will be useful
for organizations like Commission of Railway Safety and others in
designing and implementing safety and evacuation measures.

Authors:

• Manoj Sarda
• Abhishek Agarwal
• Juhi Kaushik
• Vatsal Sanjay
• Arup Kumar Das

Keywords:

• Air-conditioned coaches
• fire propagation
• flame contour
• soot flow
• train fire.

References:

[1] “26 die in sleep as fire breaks out on train from bangalore,” The Indian
Express, 2013-12-29.
[2] “Two howrah-dehradun express coaches catch fire, 7 dead,” India Today,
2011-11-22.
[3] “Two ac coaches of gt express from chennai catch fire,” Hindustan
Times, 2012-11-30.
[4] N. Markatos, M. Malin, and G. Cox, “Mathematical modelling of
buoyancy-induced smoke flow in enclosures,” International Journal of
Heat and Mass Transfer, vol. 25, no. 1, pp. 63–75, 1982.
[5] S.-J. MO, Z.-R. Li, D. Liang, J.-X. Li, and N.-J. Zhou, “Analysis of
smoke hazard in train compartment fire accidents base on fds,” Procedia
Engineering, vol. 52, pp. 284–289, 2013.
[6] W.-K. Chow, K. Lam, N. Fong, S. Li, and Y. Gao, “Numerical
simulations for a typical train fire in china,” Modelling and Simulation
in Engineering, vol. 2011, p. 4, 2011.
[7] N. White, V. Dowling, and J. Barnett, “Full-scale fire experiment on
a typical passenger train,” Fire Safety Science, vol. 8, pp. 1157–1168,
2005.
[8] H. Ingason and A. L¨onnermark, “Heat release rates from heavy goods
vehicle trailer fires in tunnels,” Fire Safety Journal, vol. 40, no. 7, pp.
646–668, 2005.
[9] R. D. Peacock, P. A. Reneke, W. W. Jones, R. W. Bukowski,
and V. Babrauskas, “Concepts for fire protection of passenger rail
transportation vehicles: past, present, and future,” Fire and Materials,
vol. 19, no. 2, pp. 71–87, 1995.
[10] A. Haack, “Fire protection in traffic tunnels: general aspects and results
of the eureka project,” Tunnelling and underground space technology,
vol. 13, no. 4, pp. 377–381, 1998.
[11] A. Enbaya, T. Asim, R. Mishra, and R. B. Rao, “Fire safety analysis of a
railway compartment using computational fluid dynamics,” International
Journal of COMADEM, 2015.
[12] S. Vatsal and D. Arup Kumar, “Building fire safety: Numerical
simulation and evacuation planning,” in International Conference of the
International Building Performance Simulation Association, Hyderabad,
India, December 7-9, 2015, vol. 14. IBPSA, 2016, pp. 897–904. [13] A. Yuen, G. Yeoh, R. Alexander, and M. Cook, “Fire scene
reconstruction of a furnished compartment room in a house fire,” Case
Studies in Fire Safety, vol. 1, pp. 29–35, 2014.
[14] H.-T. Chen and S.-K. Lee, “Estimation of heat-transfer characteristics
on the hot surface of glass pane with down-flowing water film,” Building
and environment, vol. 45, no. 10, pp. 2089–2099, 2010.
[15] A complete guide to Indian railway air conditioning. Indian Railways
Institute of Electrical Engineering Nasik.
[16] K. McGrattan, S. Hostikka, J. Floyd, H. Baum, R. Rehm, W. Mell, and
R. McDermott, “Fire dynamics simulator (version 5), technical reference
guide,” NIST special publication, vol. 1018, no. 5, 2004.
[17] K. B. McGrattan and G. P. Forney, Fire Dynamics Simulator: User’s
Manual. US Department of Commerce, Technology Administration,
National Institute of Standards and Technology, 2000.