QUANTIFICATION OF MASS FLOW RATE OF FIRE PLUME AND DOWNWARD-MOVING GASES

DOI Web Site 1 Citations 3 References
  • OTA Mitsuru
    Graduate School of Science and Technology, Tokyo University of Science
  • OHMIYA Yoshifumi
    Faculty of Sciences and Technology, Tokyo University of Science, Dr. Eng.
  • MATSUYAMA Ken
    Center for Fire Science and Technology, Tokyo University of Science, Dr. Eng.
  • NOAKI Masaki
    Center for Fire Science and Technology, Tokyo University of Science
  • YAMAGUCHI Jun-ichi
    Obayashi Corporation Technical Research Institute, Dr. Eng.

Bibliographic Information

Other Title
  • 散水時の火災プルーム流量と下層貫入流量の定量化
  • A study on smoke behavior in a compartment with sprinkler system activation Part 2
  • スプリンクラー設備作動時の区画内煙性状　その2

Abstract

It is necessary to determine quantitatively a mass flow rate of downward-moving gases penetrated the boundary between upper and lower layer and fire plume in order to calculate smoke behavior in a compartment with sprinkler activation. A calculating formula of the mass flow rate of fire plume and downward-moving gases was found using a suggested gas analysis in the previous report of this study. The mass flow rate of downward-moving gases is mE/mSP=0.003(ρa-ρS)-1 in inverse proportion to density differences between upper layer and lower layer. The mass flow rate of fire plume was corrected by the location of the virtual source in the sprinkling. The effective virtual source with sprinkler activation is ZSP=0.04(ρa-ρS)-1 in inverse proportion to density differences between upper layer and lower layer. As a result, the mass flow rate of fire plume was proportional to Qf2/3(ZS+ZSP)5/3 and given by mp=0.03 Qf2/3(ZS+ZSP)5/3+mE.

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