The direct exposure to fire is not the most immediate threat to passengers& / #8217 / life in case
of fire in an underground transportation system. Most of the casualties in fire are the
results of smoke-inhalation. Numerical simulation of fire and smoke propagation
provides a useful tool when assessing the consequence and deciding the best
evacuation strategy in case of a train fire inside the underground transportation
system. In a station fire the emergency ventilation system must be capable of
removing the heat, smoke and toxic products of combustion from the evacuation
routes to ensure safe egress from the underground transportation system station to a
safe location. In recent years Computational Fluid Dynamics has been used as a tool
to evaluate the performance of emergency ventilation systems. In this thesis,
Computational Fluid Dynamics technique is used to simulate a fire incidence in
underground transportation systems station. Several case studies are performed in two different stations in order to determine the safest evacuation scenario in
CFDesign 7.0. CFD simulations utilize three dimensional models of the station in
order to achieve a more realistic representation of the flow physics within the
complex geometry. The steady state and transient analyses are performed within a
simulation of a train fire in the subway station. A fire is represented as a source of
smoke and energy. In transient analyses, a fast t2 growth curve is used for the heat
release rate and smoke release rate. The results of the studies are given as contour
plots of temperature, velocity and smoke concentration distributions. One of the case
studies is compared with a code well known in the discipline, the Fire Dynamics
Simulator, specifically developed for fire simulation. In selection of the preferred
direction of evacuation, fundamental principles taken into consideration are stated.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12606115/index.pdf |
| Date | 01 June 2005 |
| Creators | Kayili, Serkan |
| Contributors | Eralp, Osman Cahit |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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