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Study of Pollutant Formation and Its Control in the Non-Uniform Combustion

Research Project

Project/Area Number 05452159
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

IKEGAMI Makoto  Kyoto Univ., Energy Sci.&Engr., Professor, 工学部, 教授 (70025914)

Co-Investigator(Kenkyū-buntansha) YAMANE Koji  Kyoto Univ., Mech.Engr., Lecturer, 工学部, 講師 (10210501)
SHIOJI Masahiro  Kyoto Univ., ibid, Assoc.Professor, 工学部, 助教授 (80135524)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥5,000,000 (Direct Cost: ¥5,000,000)
KeywordsNon-Unifrom Combustion / Turbulent Mixing / Nitrogen Oxides / Chemical Kinetics / Two-Stage Combustion / Jet Diffusion Flame / Particle Image Velocimetry / Laser Light-Sheeting Method / バロクリニック効果 / 粒子画像流速測定
Research Abstract

This study aims at the clarification of the non-uniform combustion process in highly-turbulent flowfields for controlling pollutant formation during combustion. The contents of the prsent study are summarized as follows :
1.Turbulence in jet diffusion flames was investigated based on observations of instantaneous LLS (laser-light sheet method) images of turbulent eddies. Results show that only larger eddies can be seen mainly on the azimuthal cross-section, and that mixing between fuel and air mainly proceeds by stretching of the interfacial layr during development of vortex rings due to an ejecting flow. Furthermore, the capability of inducing vortices near the zone of a higher density gradient due to baroclinic effect was discussed using a vorticity-transport equation.
2.Particle image velocimetry (PIV) for measuring velocity vectors in a turbulent flow was developed based on a two dimensional cross-correlation coefficient between two images with a small time interval. An accuracy of P … More IV was assessed at probable errors using the simulated images. The measured results in jets and jet flames reveal that vortex rings produced associated with the unsteady motion in the shear layr promote the mixing, whereas in the reacting region fluctuating motions are laminarized due to an increase in temperature, causing the complicated pattern of soot layrs in the downstream of flame.
3.Production and destruction of nitrogen oxides in the two-stage combustion was investigated based on a detailed chemical kinetics. From the analysis of dilution processes of methane-air fuel-rich burnt gas, it is shown that fast mixing due to strong turbulence causes a considerable NOx reduction, and that a further reduction can be achieved if the temperature decreases with the volume expansion prior to the heat-release due to the dilution. In addition, reaction paths into NOx formation were discussed in the conditions of different presure and air-temperature, and contributions of individual elementary reactions were given by the integration of each NO formation rate. Less

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] M.Ikegami: "Turbulent Eddies in Gaseous Jet Diffusion Flames" Ninth Symposium on Turbulent Shear Flows. 31-4. 1-6 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 塩路昌宏: "相互相関PIVによる噴流内流速分布の測定" 第31回燃焼シンポジウム講演論文集. 268-270 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 山田修: "過濃および過薄ガスの混合を伴う燃焼における窒素酸化物の生成と分解" 日本機械学会講演論文集(関西支部第69期定時総会講演会). No.944-2. 286-288 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 塩路昌宏: "温度低下と希薄化を受ける燃焼ガスのNOx生成および分解" 日本機械学会講演論文集. No.944-4. 209-211 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 塩路昌宏: "相互相関PIVによる噴流火炎内ガス流動の解析" 第32回燃焼シンポジウム講演論文集. 434-436 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 塩路昌宏: "燃焼ガスの希薄化過程におけるNOxの生成および分解" 日本機械学会講演論文集(関西支部第69期定時総会講演会). No.954-2. 172-174 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Ikegami: "Turbulent Eddies in Gaseous Jet Diffusion Flames" Ninth Symposium on "Turbulent Shear Flows". 31-4. 1-6 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Shioji: "Measurements of Velocity Distribution in a Jet using Cross-Correlation PIV" 31st Symposium on Combustion. 268-270 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] O.Yamada: "Production and Destruction of Oxides of Nitrogen During Combution with Mixing of Fuel-Rich and Lean Burnt Gases" Proc.JSME Meeting (Kansai Branch). No.944-2. 286-288 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Shioji: "Production and Destruction of NOx During Combustion Associated with Temperature Drop and Mixture Dilution" Proc.JSME Meeting (Kansai Branch). No.944-4. 209-211 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Shoji: "Analysis of Gas Flows in a Trubulent Jet Flame using Cross-Correlation PIV" 32nd Symposium on Combus-tion. 434-436 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] M.Shioji: "Production and Destruction of NOx in Dilution Process of Fuel-Rich Burnt Gases" Proc.JSME Meeting (Kansai Branch). No.954-2. 172-174 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 塩路 昌宏: "温度低下と希薄化を受ける燃焼ガスのNOx生成および分解" 日本機械学会講演論文集(関西支部第253回講演会). No.944-4. 209-211 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 塩路 昌宏: "相互相関PIVによる噴流火炎内ガス流動の解析" 第32回燃焼シンポジウム講演論文集. 434-436 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 塩路 昌宏: "燃焼ガスの希薄化過程におけるNOxの生成および分解" 日本機械学会講演論文集(関西支部第70期定時総会講演会). No.954-2. (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.IKEGAMI: "Turbulent Eddies in Gaseous Diffusion Flames" 9th Symposium on “Turbulent Shear Flows". 31.4.1-31.4.6 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 山田 修: "過濃および過薄ガスの混合を伴う燃焼における窒素酸化物の生成と分解" 日本機械学会関西支部第69期定時総会講演会. (発表予定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 池上 詢: "拡散火炎面に及ぼす圧力・密度勾配の作用" 日本機械学会第71期通常総会講演会. (発表予定). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 塩路 昌宏: "相互相関PIVによる噴流内流速分布の測定" 第31回燃焼シンポジウム講演前刷集. 268-270 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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