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An Investigation on the Structure of Spray Flames Using the Spectral Analysis and the Image Processing of Light Emissions and Mie-scattering from Droplets

Research Project

Project/Area Number 01460118
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionOsaka University

Principal Investigator

MIZUTANI Yukio  Osaka University, Engineering, Professor, 工学部, 教授 (80028993)

Co-Investigator(Kenkyū-buntansha) NAKABE Kazuyoshi  Osaka University, Engineering, Research Associate, 工学部, 助手 (80164268)
KATSUKI Masashi  Osaka University, Engineering, Associate Professor, 工学部, 助教授 (20029292)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsCombustion / Visualization Technique / Image Processing / Radical / Chemiluminescence / Luminous Light Emission / Mie-scattering / Signal Processing / 燃焼 / 固体発光
Research Abstract

(1) The chemiluminescence characteristics of OH, CH, and C_2 radicals in flames were investigated and the visualization technique for radical luminescences was examined in terms of computer simulation based on the spectroscopic observation of a Wolfhard-Parker burner flame which had a geometry suitable for optical observation. Then, we developed an optical system which enabled us to separate the radical luminescences from the background flame luminosity (principally solid emission from soot) and to visualize them after processing simultaneously a few flame images obtained through different optical interference filters.
(2) We constructed two identical imaging systems consisting of one or a few interference filters, an image intensifier, a set of coupling lenses and a CCD camera, and installed in each a focalーplane shutter controlled by a personal computer. Then, we manufactured a control device which enabled us to obtain the most suitable combination of flame images ; e. g., an OH radic … More al luminescence image coupled with a flame image at C_2 radical emission band (principally solid emission from soot) or a Mie-scattering image of droplets, simultaneously, as well as to obtain two successive frames of a flame image.
(3) We also manufactured an optical system for monitoring through appropriate filters the light emissions in OH- and CH-bands as well as the light scattered by droplets at a point in the flame.
(4) The flame structure of premixed sprays was observed by visualizing the light emissions in various radical bands and the droplet Mie-scattering using the above mentioned optical devices. The image informations were combined with those of local continuous monitoring of radical emissions and Mie-scattering. The experimental results were summarized as follows : (a) Flame propagated preferentially through the regions where gaseous fuel and droplets coexisted ; (b) In case of a small liquid-fuel fraction in the total fuel (consisting of liquid kerosene, and the vapors of kerosene and/or propane), the liquid fuel (droplets) completed evaporation and combustion in a thin reaction zone, and the gas-phase reaction in premixed-combustion mode prevailed throughout a whole droplet cluster ; (c) In case of a large liquid-fuel fraction in the total fuel, the gas-phase reaction occurred outside a large-scaled droplet cluster, whereas small dense clusters involved in it burned with diffusion flame-lets emitting intense solid emissions from soot, which implied that sprays burned not in a simple group combustion mode but in a hierarchic one. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Yukio MIZUTANI: "Processing of Lumimescent Radical Images for Flame Diagnostics" JSME International Journal Ser.II. 32. 455-463 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 中部 主敬: "火炎発光と油滴ミ-散乱による噴霧火炎と気液混焼火炎の構造観察" 日本機械学会論文集(B編). 55. 2517-2525 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "Detailed Flame Structures of Liquid Sprays and GasーLiquid Coburning Mixtures" Extended Abstracts: Joint Conference Australia/New Zealand and Japanese Sections. 254-256 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "Simultaneous Visualization of Droplet Clusters, Chemiluminescence and Spectral Luminosity in Spray Flames" The 3rd ASMEーJSMEThermal Engineering Joint Conference. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "An Experimental Study on Detailed Flame Structure of Liquid Fuel Sprays with and without Gaseous Fuel" Combustion and Flame. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Yukio MIZUTANI: "Processing of Luminescent Radical Images for Flame Diagnostics" JSME International Journal Series II. 32-3. 455-463 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "A Study on the Structure of Spray Flames in Terms of Their Light Emission and Mie-Scattering of Droplets" Journal of JSME Series. B, 55-516. 2517-2525 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "Detailed Flame Structures of Liquid Sprays and Gas-Liquid Coburning Mixtures" Extended Abstracts : Joint Conference Australia/New Zealand and Japanese Sections. 254-256 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "Simultaneous Visualization of Droplet Clusters, Chemiluminescence and Spectral Luminosity in Spray Flames" The 3rd ASME-JSME Thermal Engineering Joint Conference.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Kazuyoshi NAKABE: "An Experimental Study on Detailed Flame Structure of Liquid Fuel Sprays with and without Gaseous Fuel" Combustion and Flame.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 赤松 史光: "火炎発光と油滴ミ-散乱による噴霧火炎と気液混焼火炎の構造観察(第4報)" 日本機械学会関西支部第65期定期総会講演会講演概要集. 904ー2. 47-48 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 赤松 史光: "火炎発光と油滴ミ-散乱による噴霧火炎と気液混焼火炎の構造観察(第5報)" 日本機械学会関西支部第249回講演会講演論文集. 904ー4. 109-111 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kazuyoshi NAKABE: "Simultaneous Visualization of Droplet Clusters,Chemiluminescence and Spectral Luminosity in Spray Flames" The 3rd ASMEーJSME Thermal Engineering Joint Conference. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kazuyoshi NAKABE: "An Experimental Study on Detailed Flame Structure of Liquid Fuel Sprays with and without Gaseous Fuel" Combustion and Flame. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yukio MIZUTANI: "Processing of Luminescent Radical Images for Flame Diagnostics" JSME International Journal Series II. 32. 455-463 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 中部主敬: "火炎発光と油滴ミ-散乱による噴霧火炎と気液混焼火炎の構造観察" 日本機械学会論文集(B編). 55. 2517-2525 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Kazuyoshi NAKABE: "Detailed Flame Structures of Liquid Sprays and Gas-Liquid Coburning Mixtures" Extended Abstracts:Joint Conference Australia/New Zealand and Japanese Sections. 254-256 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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