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Theoretical Analyses of Combustion Characteristics of Diluted and Preheated Combustible Gas Mixtures

Research Project

Project/Area Number 08455108
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

FUKUTANI Seishiro  Okayama Prefectural Unversity, Department of System Engineering, Professor, 情報工学部, 教授 (40026208)

Co-Investigator(Kenkyū-buntansha) KUNIOSHI Nilson  Okayama Prefectural Unversity, Department of System Engineering, Associate Profe, 情報工学部, 助教授 (30254577)
Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1996: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordshydrocarbon flames / preheating / dilution / combustion characteristics / 炭化水素火災 / 燃料流束 / 予混合火災 / NOx
Research Abstract

The combustion characteristics of diluted and preheated methane-air premixed and diffusion flames were analysed through flat-flame and counterfiow diffusion flame models. The results concerning to the premixed flame, or the flame in which the mixing rate of methane and air is very high, can be summarized as follows :
1. In flames whose adiabatic flame temperature is higher than 2200 K, the fuel flux can be raised by diluting and preheating the metane-air mixture, independently of the air ratio. For the NO emission, in general, the greater the oxygen ratio the better, but there are optimum values for both the oxygen ratio and the preheating temperature.
2. For flames whose adiabatic flame temperature is below 2000 K, both fuel flux and NO emission do not show strong dependence with neither dilution nor preheating. For these flames, preheating and dilution should be considered as the means to keep the condition of excess of enthalpy.
For the diffusion flame, or the flame in which the mixing between methane and air is very slow, the following results were achieved :
1. The NO emission level can be expressed as a function of the maximum flame temperature. In other words, neither the dilution nor the preheating of the air have any special effect in reducing the NO level.
2. Therefore, the effect of dilution and preheating can not be achieved in flames in which the mixing between fuel and air is slow.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Nilson Kunioshi and Seishiro Fukutani: "Structure of Diluted Methane Flames" Proceedings, of The First Asia-Pacific Conference on Combustion. 456-459 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 福谷征史郎,大地裕之 国吉ニルソン: "希釈されたメタン-空気予熱予混合気の燃焼特性" 日本機械学会論文集(B編). 64巻618号. 568-573 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Kuniyoshi and S.Fukutani: ""Structure of Diluted Methane Flames"" Proceedings of the First Asia-Pacific Conference on Combustion. 456-459 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Fukutani, H.Ooike and N.Kuniyoshi: ""Combustion Characteristics of Preheated and Diluted Methane-Air Mixtures"" Transactions of the Japan Society of Mechanical Engineers. vol.64. 568-573 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Nilson Kunioshi, Seishiro Fukutani: "Structure of Diluted Methane Flames" Proceedings of the Firsy Asia-Pasific Confereuce on Combustion. 456-459 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 福谷征史郎 大池裕之 国吉ニルソン: "希釈されたメタン-空気予熱予混合気の燃焼特性" 日本機械学会論文集(B編). 64巻618号. 568-573 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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