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Flame Behavior and Thermal Propertoifes a Jet Flame with a HighInitial Discharging Velocity

Research Project

Project/Area Number 22310105
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Social systems engineering/Safety system
Research InstitutionTokyo University of Science, Suwa

Principal Investigator

SUGAWA Osami  諏訪東京理科大学, システム工学部, 教授 (60162856)

Co-Investigator(Kenkyū-buntansha) IMAMURA Tomohiko  諏訪東京理科大学, システム工学部, 助教 (50450664)
Project Period (FY) 2010 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2010: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
Keywords火災 / バックドラフト / 噴出時火炎 / 乱流拡散火炎 / 火炎性状 / 物理モデル / 噴出角度 / 液体燃料 / 噴出時火災 / 乱流拡散火災 / 火災性状
Research Abstract

In order to investigate flame behavior and thermal properties of the jet flame with comparatively high initial velocity, a series of experiments was carried out. The jet flame was made vertically in the present experiment, and to investigate the influence of the flame formation direction on the flame behavior and thermal properties, present experimental datum were compared with the datum of the flame length and temperature of hydrogen jet flame in reference. The fuel releasing time and the mass flow rate of fuel were varied as experimental conditions. At least one second is necessary to reach a quasi steady state for the height of the jet flame with comparatively high initial velocity, and at least three seconds is necessary for the temperature around the jet flame. The range that the flame height (flame formation direction: vertical) and/or flame length (flame formation direction: horizontal) depend on the Q*2/5 and the range that the flame height and/or flame length don't deped the heat rlease rate can be divided by the range of RM which implies the ratio of the gas release momentum to the momentum generated by a purely buoyant diffusion flame, regardless of the range of Q*. The temperature along the central axis of the jet flame maintains similarity with the change of the heat release rate. The starting point of the temperature decrease was moved further position from the fire source which was the outlet of the fuel releasing nozzle. But once the temperature decrease starts, the temperature decreased more rapid than McCaffrey's relation. The empirical formulae on the temperature along the central axis of the jet flame were developed which can predict regardless of the formation direction of the jet flame.

Report

(4 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (11 results)

All 2011 2010

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (7 results)

  • [Journal Article] Flame Height of a Turbulent Diffusion Jet Flame with a Comparatively High Initial Discharging Velocity2011

    • Author(s)
      Tomohiko Imamura, Osami Sugawa, Kyoko Kamiya, Yasushi Oka, Tosimitsu Suzuki and Yutaka Yamamoto
    • Journal Title

      Journal of Fire Science and Technology

      Volume: Vol.29 Pages: 15-26

    • NAID

      130004503351

    • Related Report
      2012 Final Research Report
  • [Journal Article] Flame Behavior and Thermal Properties of a Jet Flame with a High Initial Discharging Velocity2011

    • Author(s)
      Tomohiko Imamura, Osami Sugawa, Kyoko Kamiya, Yasushi Oka, Tosimitsu Suzuki and Yutaka Yamamoto
    • Journal Title

      Proceedings of 8th Asia-Oceania Symposium on Fire Science and Technology

      Volume: CD-ROM

    • Related Report
      2012 Final Research Report
  • [Journal Article] Flame Height of a Turbulent Diffusion Jet Flame with a Comparatively High Initial Discharging Velocity2011

    • Author(s)
      Imamura, T., Sugawa, O., Kamiya, K., Oka, Y., Suzuki, T., Yamamoto, Y.
    • Journal Title

      Journal of Fire Science and Technology

      Volume: 29(印刷中)

    • NAID

      130004503351

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Flame Behavior and Thermal Properties of a Jet Flame with a High Initial Discharging Velocity2011

    • Author(s)
      Imamura, T., Sugawa, O., Kamiya, K., Oka, Y., Suzuki, T., Yamamoto, Y.
    • Journal Title

      Proceedings of 8th Asia-Oceania Symposium on Fire Science and Technology

      Volume: (CD-ROM)

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Presentation] 高速噴出時火炎の形状に及ぼす噴射角度の影響2011

    • Author(s)
      今村友彦、塚原瑞貴、石川亮、須川修身、上矢恭子
    • Organizer
      平成23年度日本火災学会研究発表会
    • Place of Presentation
      東京理科大学森戸記念館
    • Year and Date
      2011-05-17
    • Related Report
      2011 Annual Research Report
  • [Presentation] 高速噴出時火炎の形状に及ぼす噴出角度の影響2011

    • Author(s)
      今村友彦,塚原瑞貴,石川亮,須川修身,上矢恭子
    • Organizer
      日本火災学会研究発表会概要集
    • Related Report
      2012 Final Research Report
  • [Presentation] Flame Behavior and Thermal Properties of a Jet Flame with a High Initial Discharging Velocity2010

    • Author(s)
      Imamura, T., Sugawa, O., Kamiya, K., Oka, Y., Suzuki, T., Yamamoto, Y.
    • Organizer
      8th Asia-Oceania Symposium on Fire Safety Technology (AOSFST)
    • Place of Presentation
      Rydges on Swanston Hotel, Melbourne, Australia
    • Year and Date
      2010-12-09
    • Related Report
      2010 Annual Research Report
  • [Presentation] 比較的大きな初速度をもつ噴出時火炎の性状 その1実験概要2010

    • Author(s)
      須川修身、今村友彦、上矢恭子、鈴木俊光、山本豊
    • Organizer
      平成22年度 日本火災学会研究発表会
    • Place of Presentation
      北海道大学
    • Year and Date
      2010-05-18
    • Related Report
      2010 Annual Research Report
  • [Presentation] 比較的大きな初速度をもつ噴出時火炎の性状 その2実験結果及び考察2010

    • Author(s)
      今村友彦、須川修身、上矢恭子、鈴木俊光、山本豊
    • Organizer
      平成22年度 日本火災学会研究発表会
    • Place of Presentation
      北海道大学
    • Year and Date
      2010-05-18
    • Related Report
      2010 Annual Research Report
  • [Presentation] 比較的大きな初速度を持つ噴出時火炎の性状その1実験概要2010

    • Author(s)
      須川修身,今村友彦,上矢恭子,鈴木俊光,山本豊
    • Organizer
      日本火災学会研究発表会概要集
    • Related Report
      2012 Final Research Report
  • [Presentation] 比較的大きな初速度を持つ噴出時火炎の性状その1実験結果及び考察2010

    • Author(s)
      今村友彦,須川修身,上矢恭子,鈴木俊光,山本豊
    • Organizer
      日本火災学会研究発表会概要集
    • Related Report
      2012 Final Research Report

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Published: 2010-08-23   Modified: 2019-07-29  

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