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Burning Characteristics of Tubular Flame at High Pressure

Research Project

Project/Area Number 62460071
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionNagoya University (1988-1989)
The University of Tokyo (1987)

Principal Investigator

TAKENO Tadao  Nagoya University, Mechanical Engineering, Professor, 工学部, 教授 (90013672)

Co-Investigator(Kenkyū-buntansha) NISHIOKA Makihito  Nagoya University, Mechanical Engineering, Research Associate, 工学部, 助手 (70208148)
ISIZUKA Satoru  Tokyo University, Reaction Chemistry, Associate Professor, 工学部, 助教授 (70129162)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥2,900,000 (Direct Cost: ¥2,900,000)
KeywordsTubular Flame / High Pressure Combustion / Element of Turbulent Flame / 菅状火災 / 乱流火災要素 / 乱流燃焼要素
Research Abstract

The effects of pressure on stability and diameter(radius)of lean methane-air tubular flame were investigated by means of both experiment and numerical calculation with full kinetic mechanism. The pressure was varied from 1 to 4 atm. The conclusions are as follows.
1. At a given pressure, flame can only be stabilized within a region determined by fuel concentration and ejection velocity of premixed gas.
2. At a fixed pressure, when ejection velocity is increased the lean limit of fuel concentration is increased and the stable region becomes narrower.
3. When pressure is increased, the lean limit of fuel concentration increases and the stable region becomes narrower.
4. At fixed pressure and ejection velocity, flame diameter increases with fuel concentration. And at fixed pressure and fuel concentration, flame diameter decreases with ejection velocity.
5. At fixed ejection velocity and fuel concentration, flame diameter decreases with pressure.
Furthermore, the effects of radial velocity gradient on behaviors of stoichiometric methane-air tubular flame at pressure from 1 to 8 atm were investigated by means of numerical calculation mentioned above. The conclusions are as follows.
6. At any pressure, when velocity gradient increases, flame radius and flame temperature decrease. And at a critical velocity gradient the flame finally extinguishes.
7. At a fixed velocity gradient, when pressure increases, flame radius decreases and flame temperature increases.
8. The critical velocity gradient at which extinction occurs increases with pressure below 2.7 atm, and decreases above that.
9. The flame radius at extinction, which corresponds to the minimum radius, decreases with pressure and approaches to around 0.2mm. Thus, at higher pressure flame with smaller radius is not thought to be realized.

Report

(4 results)
  • 1991 Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 竹野 忠夫,石塚 悟,西岡 牧人: "管状火炎の研究" 日本航空宇宙学会誌. 36. 173-180 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T.Takeno,M.Nishioka,S.Ishizuka: "Burning Velocity of Stretched Flame" Mathematical Modeling in Combustion Science (Springer Verlag). 103-111 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Nishioka,T.Takeno,S.Ishizuka: "Effect of Variable Density on a Tubular Flame" Combustion and Flame. 73. 287-301 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Nishioka,k.Inagaki,S.Ishizuka,T.Takeno: "Effect of Pressure on Structure and Extinction of Tubular Flame" Combustion and Flame. 86. 90-100 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. Takeno, S. Ishizuka and M. Nishioka: ""Investigation of Tubular Flame"" Journal of the Japan Society for Aeronautical and Space Sciences. 36-411. 173-180 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] T. Takeno, M. Nishioka and S. Ishizuka: ""Burning Velocity of Stretched Flame"" Mathematical Modeling in Combustion Science. Springer Verlag. 103-111 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Nishioka, T. Takeno and S. Ishizuka: ""Effect of Variable Density on a Tubular Flame"" Combustion and Flame. 73. 287-301 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Nishioka, K. Inagaki, S. Ishizuka and T. Takeno: ""Effects of Pressure on Structure and Extinction" Combustion and Flame. 86. 90-100 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹野忠夫,石塚悟,西岡牧人: "菅状火災の研究" 日本航空宇宙学会誌. 36. 173-180 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Takeno,M.Nishioka,S.Ishizuka: "Burning Velocity of Stretched Flame" Mathematical Modeling in Combustion Science(Springer Verlag). 103-111 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Nishioka,T.Takeno,S.Ishizuka: "Effect of Variable Density on a Tubular Flame" Combustion and Flame. 73. 287-301 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 竹野忠夫,石塚悟,西岡牧人: 日本航空宇宙学会誌. 36. 173-180 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] T.TAKENO;M.NISHIOKA;S.ISHIZUKA: Mathematical Modeling in Combustion Science (Springer Verlag). 103-111 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.NISHIOKA;T.TAKENO;S.ISHIZUKA: Combustion and Flame. 73. 287-301 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] M.Nishioka;S.Ishizuka;T.Takeno: Combustion and Flawl.

    • Related Report
      1987 Annual Research Report
  • [Publications] 竹野忠夫;石塚悟;西岡牧人: 日本航空宇宙学会誌.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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