ANALYSIS OF CRITICAL AIR VELOCITY FOR TUNNEL FIRES CONTROLED BY VENTILATION
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The article discusses scenarios for the development of fires in open spaces, in apartments and in tunnels. On the basis of a theoretical analysis of powerful fires, the possibility of the collapse of the ventilation system of tunnels is shown. Graphs of changes in fire power are given as a function of air velocity for fires controlled by ventilation in tunnels. Critical velocity ensuring efficient combustion product management has been analyzed for high-power tunnel fires. The dependence of the change in the critical value of the Froude criterion on the critical air velocity is shown. It is shown that it is not advisable to use the critical Froude number for analyzing the critical speed of fires with small magnitudes
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