A study on ceiling jet flow behaviour
| Project/Area Number |
23310108
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Social systems engineering/Safety system
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| Research Institution | Yokohama National University |
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Principal Investigator |
OKA YASUSHI 横浜国立大学, 環境情報研究院, 准教授 (10240764)
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| Co-Investigator(Kenkyū-buntansha) |
OKA Hideyuki 海上技術安全研究所, 海洋リスク評価系システム安全技術研究グループ, 主任研究員 (80399518)
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| Research Collaborator |
IMAZEKI Osamu 鹿島建設, IT ソルーション部, 次長
MURAOKA Ko 大林組, 技術研究所, 主任研究員
YAMAGUCHI Jyunichi 大林組, 技術研究所, 主任研究員
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2012: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2011: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | 火災感知 / 天井流 / 傾斜天井 / 煙層 / 垂れ壁 / トンネル |
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| Research Abstract |
A series of experiments that focused on the flow behavior of ceiling jet, which flows under an unconfined ceiling, were conducted. Based on the experimental results, empirical formula for temperature rise and velocity decreasing, thickness and distribution against radial distance were developed considering the effect of inclination angle.
To examine the effect of fire source shape to the ceiling jet flow, the rectangular fire source was employed. By comparing the temperature rise decreasing and temperature distribution with them obtained by a square fire source, typical difference for temperature rise decreasing against radial distance was confirmed. Detailed measurements of the temperature rise and velocity in a horizontal tunnel with a rectangular cross section were conducted to examine the effect of side wall on the ceiling jet. Empirical relationship to estimate the decrease in the ceiling jet temperature rise and velocity along the horizontal axis of the tunnel was developed.
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Report
(4 results)
Research Products
(17 results)
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[Journal Article] Temperature Property of Ceiling Jet in An Inclined Tunnel2013
Author(s)
Oka, Y., Kakae, N., Imazeki, O., and Inagaki, K.
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Journal Title
Procedia Engineering . Special issue, Proceedings of 9th Asia-Oceania Symposium on Fire Science and Technology, Hefei, China
Volume: Vol.62
Pages: 234-241
Related Report
Peer Reviewed
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