強風下における帯状熱源からの熱気流の風下温度分布 : 強風下の市街地大火における火災気流の温度分布に関する基礎的研究

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  • TEMPERATURE DISTRIBUTION OF FIRE GAS FLOW FROM A BELT-SHAPED HEAT SOURCE UNDER STRONG WIND : Study on temperature distribution of big fire in urban area under strong wind
  • キョウフウカ ニ オケル タイジョウ ネツゲン カラ ノ ネツ キリュウ ノ
  • Temperature distribution of fire gas flow from a belt-shaped heat source under strong wind

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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.

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