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Investigate of Effective Parameters on Critical Ventilation Velocity in Tunnels

Amnian Some’e kouchak, Javad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42208 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. Suitable design of ventilation systems is one of the strategies to deal with phenomenon like fire in tunnels. For design a ventilation system first should recognize fire and effective parameters on it. So we need a good modeling of fire. Whereas the aim of this research is investigate the critical ventilation velocity, we only studying the effects of fire. Two effective parameter of fire is the rate of heat release and rate of smoke release, therefore with studying physics and nature of fire, obtain these parameters. After calculation of fire effects, we should investigate the effective parameters on critical ventilation velocity. The critical velocity is the air flow that helps prevent backlayering of smoke and heat to upstream of region. If the air velocity is lower than critical velocity, smoke and heat and effects of fire is spread in upstream of fire and the visibility and fresh air is reduced in tunnel. In air velocities higher than critical velocity, smoke, heat and other effects of fire moving to the downstream of fire and we have a fresh and safe way for escape passengers. Heat release rate, the cross section of train in tunnel, ambient temperature and pressure, curvature and slope of tunnel are the effective parameters on critical ventilation velocity. After modeling fire and smoke and investigate the effective parameters on critical ventilation velocity, we verify the modeling with experimental data. After verifying the, obtain the critical ventilation velocity for a real tunnel.
  9. Keywords:
  10. Back Mixing ; Critical Ventilation Velocity ; Fire Modeling ; Smoke Modeling ; Tunnel Ventilation

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