火災時におけるトンネル内熱気流の温度成層特性

概要

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The temperature stratification of heated air flow in a fire tunnel is investigated by the two- and three-dimensional experiments and numerical models described in previous papers. It is found that the heated air flow can appear to be either a stratified or a mixed flow pattern in accordance with different ventilation velocities, heat release rates, and downstream positions. To deal with tunnel fire circumstances, the mixed convection is evaluated by a macro nondimensional variable Gr^*/Re_H^<5/2>, and a quantitative relationship between Gr^*/Re_H^<5/2> and a parameter which identifies the varying degrees of the stratification at each tunnel crossection has been established. By comparing the results from two- and three-dimensional analysis, the effects of secondary flow on temperature stratification are discussed. The conclusions obtained are directly relevant to the safety considerations in tunnel fires.
一般社団法人日本機械学会の論文
1992-02-25