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Decay of Turbulence near the Local Reaction Zone of A Turbulence Premixed Flame

Research Project

Project/Area Number 07650271
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionTokyo Metropolitan Technical College

Principal Investigator

FURUKAWA Junichi  Tokyo Metropolitan Technical College, Department of Mechanical Engineering, Professor, 機械工学科, 教授 (70173523)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥1,000,000 (Direct Cost: ¥1,000,000)
Keywordscombustion / premixed flame / flame structure / turbulence / LDV / electrostatic probe / 予混合火災 / 火災構造
Research Abstract

An attempt has been made to measure the Kolmogorov scale of turbulence within the local reaction zone of a turbulent premixed flame established in a regime in which the Kolmogorov scale of turbulence in the non-reacting flow is smaller than the laminar premixed flame thickness. in order to measure the Kolmogorov scale of turbulence within the local reaction zone, the specially arranged diagnostics composed of the LDV system and the micro-electrostatic probe has been adopted. By using this technique, the velocity fluctuation within the local reaction zone can be successfully distinguished from that in unburned mixture or burned gas stream. Thus, the Kolmogorov scale of turbulence in the local reaction zone could be evaluated on the basis of the power spectrum density function derived from the velocity fluctuations.
The powers spectrum density function, the turbulence intensity and the Kolmogorov scale of turbulence derived from velocity fluctuations in the approach flow are shown to be the same as those in the non-reacting flow. Also, the small scale eddies in the non-reacting flow, which are smaller than the laminar premixed flame thickness, are confirmed to exist in the approach flow.
It is found that the approach flow turbulence increases in the local reaction zone because of the expansion of gases due to heat release. The Kolmogorov scale of turbulence derived from velocity fluctuations in the local reaction zone is shown to be much larger than the laminar premixed flame thickness. this result implies that the small scale eddies in the approach flow may not survive through the preheat zone.

Report

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

    (5 results)

All Other

All Publications (5 results)

  • [Publications] J.Furukawa: "Turblence Characteristics within the Local Reaction" 26th Symposium on Combustion.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Junichi Furukawa, Kyoko Okamoto, Toshisuke Hirano: "Turbulence Characteristics within the Local Reaction Zone of A High Intensity Turbulent Premixed Flame" Twenty-sixth Symposium (International) on Combustion. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] J.Furukawa: "Turbulence Characteristcs within the Local Reaction Zone of A" 26th Symposim on Combustion. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 古川純一: "乱流予混合火災の局所的な反応帯近傍における乱れの特性" 日本機械学会第73期全国大会講演論文集. 218-219 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 古川純一: "乱流予混合火災の局所的な反応帯近傍における乱れの特性" 第33回燃焼シンポジウム講演論文集. 508-510 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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