Some effects on natural ventilation system for subway tunnel fires

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ConferenceFifth International Symposium on Tunnel Safety & Security. Proceedings: 14 March 2012, New York, N.Y. USA
Pages19; # of pages: 9
SubjectTunnels, fires, emergency ventilation, fire and smoke control and visibility; Tunnels
AbstractA series of experiments, using a 1:15 model tunnel, were designed in accordance with the Froude conservation approach to investigate the influential parameters on temperature distributions in tunnel fires with natural ventilation. The effect of parameters such as fire size, shaft length and height were investigated. A natural ventilation system was achieved by introducing four vertical shafts spaced at 4 m in the ceiling of the tunnel. In the study reported in this paper, propane gas, located on the floor of the tunnel, was used to simulate the fire source which produced heat release rates in the range of 3.61kW to 12.2 kW. The smoke temperature distributions along the tunnel ceiling and in the vertical direction along the tunnel length were measured using K-type thermocouples trees. Based on the fire plume theory, a dimensionless temperature was defined and it was found that the fire size did not have a major effect on the dimensionless temperature. Despite the fact that the shaft sizes did not significantly affect the distribution of the temperature in the near-field of the fire, they did influence the temperature values with the temperatures dropping with the increase of shaft size. Based on the one-dimensional theory and rational assumptions, two formulas were developed to predict the ceiling longitudinal temperature distribution in tunnel fires with natural ventilation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number54599
NPARC number20375041
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Record identifier1d5f7a9c-7b99-444d-a2a6-02140f9625a2
Record created2012-07-23
Record modified2016-05-09
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