トンネル内火災時の縦流換気風に逆らった熱気流の遡上距離（模型トンネルによる火災実験）

概要

論文の詳細を見る
The backlayering phenomenon is the most important behavior in a tunnel fire. However, the backlayering distance, which is the upwind propagation length of thermal fume, has not been systematically examined so far. The backlayering distance of thermal fume in a tunnel fire was examined by using large-scale model tunnel in this study. Various longitudinal ventilation velocities and four kinds of fire size were set as experimental parameters. The following conclusions were obtained. A new expression was proposed to estimate the non-dimensional backlayering distance Lb / H by using the non-dimensional heat release rate Q* and Froude number Fr. Lb / H = a (Q*1/3 / Fr) - b. The included constants a and b in this expression are obtained from experimental data by using the least square method. The proposed expression can predict not only the backlayering distance but also the critical velocity. This expression was applied to the experimental results of other researchers.