| Project/Area Number |
04452214
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶構造・建造
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| Research Institution | KYUSU UNIVERSITY |
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Principal Investigator |
FUKUCHI Nobuyoshi Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (80039677)
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| Co-Investigator(Kenkyū-buntansha) |
THOMAS George Kyushu University, Faculty of Engineering, Research Associate, 工学部, 助手 (40243919)
WAKANA Hirotaka Kyushu University, Faculty of Engineering, Research Associate, 工学部, 助手 (00167082)
SHINODA Takeshi Kyushu University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80235548)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1993: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1992: ¥3,700,000 (Direct Cost: ¥3,700,000)
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| Keywords | Damage control / Anisotropic turbulent / Gas diffusion / Smoke interface / Keulegan number / Archimedes number / Smoke control / Atrium |
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| Research Abstract |
In the event of spontaneous outbreak of fire in a large enclosed space such as an atrium, it is necessary that the personnel can be safely evacuated, whereby, the faultless design of the smoke management system becomes important. The natural tendency to form smoke layrs below the ceiling in the absence of properly balanced heat and gas distribution in the air convection, could make the phenomenon of smoke scattering complicated.
This study makes an investigation of smoke interface formation and diffusion characteristics in an atrium-like space under fire for the purpose of effective smoke control. The formation condition of smoke layr interface is deduced by applying the profile method to the state equations, which was also confirmed experimentally. The analysis of smoke diffusino takes into account of an anisotropic turbulent blow with the buoyancy effects included in the momentum, heat and smoke transfer equations with a few basic assumptions made on some smoke properties. From the results of the numerical calculation in a three decked large atrium, it was clarified that by driving a smoke exhaust fan at the top of the atrium could effectively prevent the smoke diffusion.
The results are summarized as follows.
(1) It can be seen that the present analytecal method in general can be used to predict smoke diffusion characteristics in enclosed spaces.
(2) Smoke tendds to accumulate the highest decked space.
(3) It is very effective for purging smoke to operate the exhaust fan installed at top ceilling.
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