換気支配火災における未燃焼ガス流出に関する実験 Experiment on Out-flowing Unburned Combustible Gus on Ventilation Control Fire

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換気支配火災に至る室火災において,流出する煙の性状を,特に未燃焼ガス濃度に着目して,模型実験を行い,開口の形状および固体(PMMA)火源,液体(メタノール)火源の可燃物特性の差異との関連を主に求めた。結論として,<br>1)火源材料の固体,液体の違いは発熱量変化にのみ差があり,流出煙特性と発熱量自体との関係には本質的な差がみられなかった。<br>2)未燃焼ガスは換気支配火災時に多く発生するが燃料支配で終始する開口に近い大きさで濃度が最大となり,より小さい開口での換気支配火災ではかえって濃度が低くなる。<br>3)横長開口の場合は,新鮮空気の流入経路が深く関係するため同一開口定数でも開口の高さ位置によって流出煙の未燃焼ガス濃度が大きく変わる。<br>(オンラインのみ掲載)

This paper presents the characteristics of the compartment fire, especially the concentration of unburned decomposed gas, flowing out from a fire room at the ventilation control fire phase, which were investigated by the experimental study using a scale model. The experiment was conducted using an about 1/4 scale model of 600 width, 600 height and 1,200 depth constructed by 10 mm gypsum boards. The enclosure was set only one opening which is either vertically narrow or horizontally narrow with various sizes. PMMA plates or methanol in pan were burned at the center of the compartment. The concentration of hydrocarbon as an indicator of unburned gas and other terms such as ventilation rate, consumption rate of burning source and temperature field were measured. <br>The experimental results are summerized as follows. (1) As compared with liquid fuel, solid fuel like PMMA burned more slowly, of which consumption rate was proportioned to the square of time as the former being nearly constant. But in a compartment fire the relationship of burning rate with temperature, flow rate and gas concentration was not substantially different between both fuels except for their own material characteristics. (2) The consumption rate on the fuel control fire was nearly proportional to the opening factor and the rate on the ventilation control fire was larger than the value at free space burning condition for reasons of heat reception of fuel in room. (3) Though the unburned decomposed gas is essentially generated at the ventilation control fire, we can point out that the concentration was not monotonously inverse proportion to the opening factor and the maximum point of gas concentration was found in the ventilation control range near the border with fuel control range. (4) In case of vertically narrow opening such as 300 width and 100 height, fire characteristics were considerably changed with the disparity of the vertical position of the opening. The experimental evidences showed that it resulted from the change of in-flowing route of fresh air. In case of the opening touched with the floor, the out-flowing unburned gas became dangerously high concentration.

収録刊行物

  • 日本火災学会論文集

    日本火災学会論文集 43(1), 1-9, 1995-09-30

    日本火災学会

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各種コード

  • NII論文ID(NAID)
    10002685771
  • NII書誌ID(NCID)
    AN0018688X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05460794
  • NDL 記事登録ID
    3621034
  • NDL 刊行物分類
    M036(環境科学・自然災害・防災科学--火災)
  • NDL 雑誌分類
    ZN1(科学技術--建設工学・建設業)
  • NDL 請求記号
    Z16-105
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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