散水時の火災ブルーム流量と下層貫入流量の定量化: スプリンクラー設備作動時の区画内煙性状　その2

摘要

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 m_E/m_(SP)=0.003(ρ_a-ρ_s)~(-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 Z_(SP)=0.04(ρ_a-ρ_s)~(-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 Q_i~(2/3)(Z_S+Z_(SP))~(5/3) and given by m_p=0.03 Q_f~(2/3)(Z_S+Z_(SP))~(5/3)+m_E.%本研究では、美大の火災区画を用いて火源に直接散水しない環境下において定常火源を用いた実験を行い、区画内温度分布やガス分析法を用いて火災プルーム流量m_p及び下層貫入流量m_Eを測定した。