Abstract
By means of computer simulation, using CFD - models, have studied the nature of the spread of fire and products of combustion, depending on the profile and of the longitudinal gradient of the tunnel, the type of ventilation system, the effect of the thermal effect of gravity and other important parameters. Established that in order to implement the evacuation is possible to use thermal effect of gravity in the event that it causes the emergence of reverse flow relative to main air flow. As a result of the marked, the rate of air flow on the place of the fire will continue to be zero, which will extend the period of the feasibility of the evacuation. To get the same effect may also use the transformable systems, which has to be folded and after disclosure covers the perimeter of the tunnel, provides isolation place of the fire and prevents the spread of fire and combustion products along the tunnel.
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