Abstract
In order to establish the preventive method of big fire in urban area under strong wind , it is necessary to comprehend the general behavior of fire gas flow and fire-spread. This paper considers big fire area as a belt-shaped heat source, purposes to obtain temperature distribution of fire gas flow from this heat source under strong wind. Equations for temperature distributions are derived by determining several prameters appearing in this model, and shown as the function of dimensionless temperature (Φ), dimensionless velocity (Ω), Froude number (Fr) and ratio (x/D) of downwind distance (x) to wide (D) of the heat source. In order to examine the relation between theory and experiment, measurements of temperature and velocity are performed in a wind tunnel which is placed a belt-shaped vessel for burning alcohol, and the validity and limitation of equations are clarified by this wind tunnel test. If the steady state of fire source is assumed, it is possible to apply the proposed equation for estimating temperature distributions of fire gas flow under strong wind.
