• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2013 Fiscal Year Final Research Report

A study on ceiling jet flow behaviour

Research Project

  • PDF
Project/Area Number 23310108
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Social systems engineering/Safety system
Research InstitutionYokohama National University

Principal Investigator

OKA YASUSHI  横浜国立大学, 環境情報研究院, 准教授 (10240764)

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)
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
Project Period (FY) 2011-04-01 – 2014-03-31
Keywords火災感知 / 天井流 / 傾斜天井 / 煙層 / 垂れ壁 / トンネル
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.

  • Research Products

    (10 results)

All 2014 2013

All Journal Article (8 results) (of which Peer Reviewed: 8 results) Presentation (2 results)

  • [Journal Article] Experimental study on temperature property along a tunnel axis with flat ceiling in natural ventilation2014

    • Author(s)
      Oka, Y., Oka, H., and Imazeki, O.
    • Journal Title

      Fire Safety and Science, Proceedings of the 11th International Symposium, International Association for Fire Safety Science

      Volume: (in press)

    • Peer Reviewed
  • [Journal Article] Temperature and Velocity Distributions of Ceiling Jet along an Inclined Ceiling -Part 1 : approximation with exponential function2014

    • Author(s)
      Oka, Y. and Imazeki, O.
    • Journal Title

      Fire Safety Journal

      Volume: Vol.65 Pages: 41-52

    • Peer Reviewed
  • [Journal Article] Temperature and Velocity Distributions of Ceiling Jet along an Inclined Ceiling -Part 2 : approximation based on cubic function and coordinate transformation2014

    • Author(s)
      Oka, Y. and Imazeki, O.
    • Journal Title

      Fire Safety Journal

      Volume: Vol.65 Pages: 53-61

    • Peer Reviewed
  • [Journal Article] Decrease of Carbon Dioxide Concentration and Entrainment of Horizontally Spreading Ceiling Jet2014

    • Author(s)
      Oka, Y., Yamaguchi, J. and Muraoka, K.
    • Journal Title

      Fire Safety Journal

      Volume: Vol.63 Pages: 37-42

    • Peer Reviewed
  • [Journal Article] Temperature Property of Ceiling Jet in An Inclined Tunnel2013

    • Author(s)
      Oka, Y., Kakae, N., Imazeki, O., and Inagaki, K.
    • 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

    • Peer Reviewed
  • [Journal Article] Scale Similarity on Ceiling Jet Flow2013

    • Author(s)
      Oka, Y. and Matsuyama, K.
    • Journal Title

      Fire Safety Journal

      Volume: Vol.61 Pages: 289-297

    • Peer Reviewed
  • [Journal Article] Temperature properties of ceiling jet in an inclined tunnel2013

    • Author(s)
      Oka, Y., Oka, H., and Matsuyama, K.
    • Journal Title

      Proceedings of 13th International Conference and Exhibition on Fire Science and Engineering (Interflam 2013)

      Pages: 73-83

    • Peer Reviewed
  • [Journal Article] Temperature and Velocity Decreasing Property of Ceiling jet Impinged on an Unconfined Inclined Ceiling2013

    • Author(s)
      Oka, Y. and Ando, M.
    • Journal Title

      Fire Safety Journal

      Volume: Vol.55 Pages: 97-105

    • Peer Reviewed
  • [Presentation] トンネル火災時の熱気流の温度性状に関する実験的研究, pp.167-1702013

    • Author(s)
      野澤孝甫,岡泰資,今関修,岡秀行
    • Organizer
      第46回安全工学研究発表会
    • Year and Date
      20131100
  • [Presentation] トンネル火災時の温度性状予測, pp.171-1742013

    • Author(s)
      藤井健,岡泰資,岡秀行
    • Organizer
      第46回安全工学研究発表会
    • Year and Date
      20131100

URL: 

Published: 2015-06-25  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi