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Evaporation and Ignition of Liquid Fuels at Critical Pressure Regime.

Research Project

Project/Area Number 06452180
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionTohoku University

Principal Investigator

NIIOKA Takashi  Institute of Fluid Science, Tohoku University, Professor, 流体科学研究所, 教授 (90208108)

Co-Investigator(Kenkyū-buntansha) MARUTA Kaoru  Institute of Fluid Science, Tohoku University, Research Associate, 流体科学研究所, 助手 (50260451)
JU Yiguang  Faculty of Engineering, Tohoku University, Lecturer, 工学研究科, 講師 (60261468)
KOBAYASHI Hideaki  Institute of Fluid Science, Tohoku University, Associate Professor, 流体科学研究所, 助教授 (30170343)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1994: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsCritical Pressure / Liquid Fuel / Spray Combustion / Droplet Combustion / High-Pressure Combustion / 液滴 / 蒸発 / 着火
Research Abstract

Ignition times of a fuel droplet were measured in a high-pressure high-temperature ambient. Suspended n-heptane, n-octane, n-decane, and n-hexadecane droplets with diameters of 0.35 to 1.4mm were quickly immersed in an electric furnace at temperatures up to 950. Attachment of a droplet, movement of the furnace and measurement of ignition were carried out in an air vessel with pressures from atmospheric pressure to over the critical pressure.
Relatively long ignition times of small droplets measured under atmospheric pressure could not be observed at high pressures and the diameter below which a droplet does not ignite became smaller with pressure for every fuel used in this research. Ignition time decreased monotonously with pressure, and even at supercritical pressures, the ignition time behavior did not change much. Being different from the case of combustion, it is suggested that drastic change of properties did not take place in ignition processes. This is basically because the surf … More ace temperature of the droplet is much lower for droplet ignition phenomena in comparison with the droplet burning.
At the second stage of the research, flame spread phenomena in a suspended fuel droplet array were investigated for n-decane and n-hexadecane in a high-pressure ambience. Seven droplets of the same size were arranged horizontally at equal spacings. Flame spread rates were measured based on OH emission histories detected by a high-speed video camera with an image intensifier for droplet diameters of 0.50,0.75, and 1.0mm at ambient pressure from 0.1 to 2.0MPa.
Results showed that, as droplet spacing became smaller, flame spread rate increased and had a maximum value at a certain spacing. A further decrease in droplet spacing caused the spread rate to decrease due to the large latent heat of vaporization. Flame spread rate decreased with pressure and no flame spread was observed at the pressure over the critical pressure. This is due to the rapid decrease in flame diameter with pressure. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Tsukamoto Tatsuro: "Numerical Simulatioh of Fuel Droplet Evaporation and Ignition under High Temperature and High Pressurc,Dynamlcs of Heterogeneous Combustion and Reacting Systems (Ed.A.L.Kuhlet al.)" Progress in Astronautics and Aeronautics. Vol.152. 263-279 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nakanishi Ryota: "Ignition Experiment of a Fuel Droplet in High-Pressure High-Temperature Ambient" Twenty-Fifth Symposium(International)on Combustion. 447-453 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Niioka Takashi: "Ignition Experiment on Droplet Array in Normal and Microgravity Environments" IUTAM Symposium on the Mechanics and Combustion of Droplets and Sprays. 367-377 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kato Shinichiro: "Flame Spread Experiment of a Fuel Droplet Array in High Pressure Ambience" Third KSME-JSME Thermal Engineerirg Conference Kyongju,KSME-JSME. 263-268 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 加藤 伸一郎: "微小重力場における燃料液滴列の燃え拡がり実験" 日本マイクログラビティー応用学会誌. 第13巻4号. 263-268 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Tsukamoto: "Numerical Simulation of Fuel Droplet Evaporation and Ignition under High Temperature and High Pressure, Dynamics of Heterogeneous Combustion and Reacting Systems (Ed.A.L Kuhl et al.)" Progress in Astronautics and Aeronautics. Vol.152. 263-279 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] R.Nakanishi: "Ignition Experiment of a Fuel Droplet in High-Pressure High-Temperature Ambient" Twenty-fifth Symposium (International) Ignition on Combustion, The Combustion Institute. 447-453 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Niioka: "Reply to the Comment by Hallett" Combustion and Flame. Vol.96. 188-189 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Niioka: "Ignition Experiment on Droplet Array in Normal and Microgravity Environments" IUTAM Symposium on the Mechanics and Combustion of Droplets and Sprays. 367-377 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.Kato: "Flame and Spread Experiment of a Fuel Droplet Array in High Pressure Ambience" Third KSME-JSME Thermal Engineering Conference, Kyongju, KSME-JSME. II-263-II-268 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 加藤伸一郎: "微小重力場における燃料液滴列の燃え拡がり実験" 日本マイクログラビティー応用学会誌. 第13巻 4号. 347-348 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kato Shinichiro: "Flame Spread Experiment of a Fuel Droplet Array in High-Pressure Ambience" The Third KSME-JSME Thermal Engineering Conference. 263-268 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] R.Nakanishiほか: "Ignition Experiment of a Fuel Droplet in High-Pressure High-Temperature Ambient" Twenty-fifth Symposium (Int.) on Combustion. 25. 447-454 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小林秀昭ほか: "高圧燃焼試験装置" 東北大学流体科学研究所報告. 6. 1-14 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Niiokaほか: "Ignition Experiments on Droplet Array in Normal and Microgravity Environments" IUTAM Symp.on Mech.and Combustion of Droplets. (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] R.Nakanishiほか: "Igniton Experiment of a Fuel Droplet in High-Pressure High-Temperature Ambient" Twenty-fifth Symposium(Int.)on Combustion. (in press).

    • Related Report
      1994 Annual Research Report
  • [Publications] 小林秀昭ほか: "高圧燃焼流試験装置" 東北大学流体科学研究所報告. (印刷中).

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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