A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The effect of fixed smoke barriers on evacuation environment in road tunnel fires with natural ventilation
This paper investigates the effect of fixed smoke barriers on the ceiling of a tunnel on improving the evacuation environment in the case of a tunnel fire. First, the behavior of thermal fumes around the smoke barriers was investigated by CFD simulation [1], and it was clarified that the thermal fume layer along the ceiling hit the smoke barrier and formed a refluxing thermal layer, thus reducing the smoke velocity. Additionally, the influence of longitudinal slope (s) and natural ventilation were investigated by the above-mentioned method. slope (s) and natural ventilation were investigated by the above-mentioned method, The Number of People Requiring Help (NPRH) (surrounded by thick smoke) in the case without smoke barriers was approximately 7 people for s = 1.5%. Meanwhile, it was clarified that when 2 m high smoke barriers were installed, NPRH for s = 1.5% was reduced to only one person, that is, NPRH may be zero by installing smoke barriers higher than 2 m. Moreover, natural ventilation was also improved by smoke barriers. Smoke barriers do not require control and maintenance and are very cheap, yet effectively block smoke and improve safety in tunnel fires.
The effect of fixed smoke barriers on evacuation environment in road tunnel fires with natural ventilation
This paper investigates the effect of fixed smoke barriers on the ceiling of a tunnel on improving the evacuation environment in the case of a tunnel fire. First, the behavior of thermal fumes around the smoke barriers was investigated by CFD simulation [1], and it was clarified that the thermal fume layer along the ceiling hit the smoke barrier and formed a refluxing thermal layer, thus reducing the smoke velocity. Additionally, the influence of longitudinal slope (s) and natural ventilation were investigated by the above-mentioned method. slope (s) and natural ventilation were investigated by the above-mentioned method, The Number of People Requiring Help (NPRH) (surrounded by thick smoke) in the case without smoke barriers was approximately 7 people for s = 1.5%. Meanwhile, it was clarified that when 2 m high smoke barriers were installed, NPRH for s = 1.5% was reduced to only one person, that is, NPRH may be zero by installing smoke barriers higher than 2 m. Moreover, natural ventilation was also improved by smoke barriers. Smoke barriers do not require control and maintenance and are very cheap, yet effectively block smoke and improve safety in tunnel fires.
The effect of fixed smoke barriers on evacuation environment in road tunnel fires with natural ventilation
Seike, M. (author) / Kawabata, N. (author) / Hasegawa, M. (author)
2014
7 Seiten, Bilder, 5 Quellen
Conference paper
English
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