A STUDY OF THE NATURAL EXHAUST EFFECT THROUGH A CHIMNEY DURING A ROAD TUNNEL FIRE -THE CASE OF A CONDITION WITH LOW LONGITUDINAL WIND SPEED-

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  • YOKOTA Masahiro
    金沢大学大学院 自然科学研究科 博士後期課程（〒920-1192 金沢市角間町） 中日本ハイウェイ・エンジニアリング東京株式会社 施設設計部
  • KAWABATA Nobuyoshi
    金沢大学 理工研究域 機械工学系

Bibliographic Information

Other Title
  • 道路トンネル火災に対する自然排煙塔による排熱特性　　‐低縦流風速の場合‐
  • A STUDY OF THE NATURAL EXHAUST EFFECT THROUGH A CHIMNEY DURING A ROAD TUNNEL FIRE
  • -THE CASE OF A CONDITION WITH LOW LONGITUDINAL WIND SPEED-
  • －低縦流風速の場合－

Description

  This paper is reviewed of the heat exhaust effectiveness during fire by installing chimney in the road tunnel, an experiment is carried out on a 1/5 scaled model tunnel, and report on this results to evaluate the numerical simulation. The model tunnel geometry and experimental conditions were set by considering Froude Number and Reynolds Number which are similarities of fire phenomenon. The amount of the heat flux that is vented from the chimney exhaust, it has shown that in the thermal fume average temperature increase in front of the vent is proportional to the 3/2 power. Results were same tendency even though it became thermal fume temperature rise. It is also shown that the heat exhaust efficiency is within a range of 0.44 to 0.61 and almost completely independent from the inside the thermal fume in front of the chimney. Furthermore, a universal validity of results of the model tunnel experiment, that LES simulator "Fireles" verified effect of the tunnel length of downward of chimney, the stream place of around chimney is almost the same, and exhaust heat flux proportional to the 3/2 power of thermal fume temperature rise have been valid similarly.

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