Study on Flame of Big Fire in Urban Area under Strong Wind - A Theoretical Study of Temperature Distribution Downwind from A Plane Heat Source -

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  • SAGA Takeshi
    Department of Architecture, Tohoku Institute of Technology

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  • 強風下の市街地火災における火災気流に関する基礎的研究―面熱源の風下温度分布式に関する理論的考察―
  • キョウフウカ ノ シガイチ カサイ ニ オケル カサイ キリュウ ニ カンスル

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Abstract

In order to clarify the firebreak method and evacuation planning of big fire in a built-up area of wooden houses, it is important to discuss the estimative method of temperature fields on the fire gas flow and the general behavior of the flame on big fire. <br>This study purposes to obtain a method of estimating the temperature distribution of fire gas flow in city fire under strong wind. <br>The author has considered fire spread and burning behavior, and then attempted to assume a plane heat source as the experimental model of burning area. In this paper, equations for temperature distributions downwind from this heat source are discussed by theoretical consideration. These formulas are derived by determining several parameters appearing in this model, and shown as the function of dimensionless temperature (Ψ), dimensionless velocity (Λ), Froude number (Fr), and ratio (X/D) of downwind distance (X) to wide (D) of a plane heat source. <br>Several formulas derived in this paper are discussed by experimental consideration. <br>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 square vessel for burning alcohol. <br>The validity and limitation of equations are clarified by this wind tunnel test.

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