450 小断面トンネル内火災時の煙挙動に関するシミュレーションによる検討(S40-2 火災科学とその応用(2),S40 火災科学とその応用)  [in Japanese] 450 Numerical Simulation of Fire Smoke in a Small Cross Sectional Tunnel  [in Japanese]

This study is an examination of the safety in case of a fire in the small cross sectional tunnel. We examined the influence that the height of the tunnel and the heat release rate give to the movement of smoke and the distance of smoke descent by means of 3-dimensional simulation. As a result, the thickness of thermal plume becomes thick in the tunnel with the ceiling higher, but the space under the thermal plume becomes large compared with the tunnel with the ceiling lower. And the distance of smoke descent becomes short in the case of the tunnel with the ceiling lower. Furthermore, it became clear that smoke is filled easily in the vicinity of the road in the small cross sectional tunnel.