大規模プール火災の時間・空間的放射特性 Temporal and Spatial Characteristics of Radiation from Large Scale Pool Fires

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著者

    • 高橋 伸英 TAKAHASHI Nobuhide
    • 東京大学工学部化学システム工学科 Depatment of Chemical System Engineering, School of Engineering, The University of Tokyo
    • 古積 博 KOSEKI Hiroshi
    • 自治省消防庁消防研究所 National Research Instiute of Fire and Disaster, Fire and Disaster Management Agency
    • 平野 敏右 HIRANO Toshisuke
    • 東京大学工学部化学システム工学科 Depatment of Chemical System Engineering, School of Engineering, The University of Tokyo

抄録

直径20mの大規模プール火災実験の熱画像データを解析し,放射特性を詳細に検討した。計算により熱画像データを放射輝度分布に変換し,火炎の各部の放射への寄与を調べた。リム近傍の定在火炎からの放射は全放射の20%程度の寄与であること,煙からの放射の寄与は60%にも達し従来言われているよりも大きいこと,間欠的に出現する輝炎は輝度が高く瞬間的な放射が問題となる場合には考慮する必要があることなどがわかった。<br>(オンラインのみ掲載)

Thermography gives detailed information on thermal radiation from fires. An apparent temperature distribution of thermography can be converted into a radiance distribution of a pool fire by simple calculations. Irradiance can be also calculated from the radiance distribution. The calculations have been validated by comparing irradiance measured by a wide view angle thermopile-type radiometer. Thus, radiative characteristics of a large-scale crude oil pool flame formed above a 20 m-diam. pan have been examined in detail by analyzing thermographic data. The results can be summarized as follows:. <br>(1) A mean radiance distribution of a large-scale pool fire represents the appearance of the largest radiance immediately above the rim of the pan and another local maximum at 0.6<i>D</i> (<i>D</i> is a pan diameter and equals 20 m) in height. The local maximum is due to intermittent luminous zones appearing among the smoke. <br>(2) The fire plume up to 0.3<i>D</i> including the continuous diffusion flame at the rim contributes to the total irradiance by about 40% and the fire plume up to 1<i>D</i> contributes to by 85%. <br>(3) The radiance of intermittent luminous zones appearing among the smoke is higher than that of continuous luminous flames and reaches 85 kW/m<sup>2</sup>/sr. The intermittent luminous zones are inferred to bring about large thermal radiation to the surroundings. <br>(4) The radiance of smoke parts on the recorded video image has been estimated to be smaller than 20 kW/m<sup>2</sup>/sr (apparent temperature; 1026K), comparing the video image with a simultaneous radiance distribution. An average proportion of irradiance emitted from the smoke parts in the total irradiance is estimated to be about 64%.

収録刊行物

  • 日本火災学会論文集

    日本火災学会論文集 49(1), 27-33, 1999-06-30

    日本火災学会

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各種コード

  • NII論文ID(NAID)
    10004570463
  • 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
    4769422
  • 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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