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2001 Fiscal Year Final Research Report Summary

Study on the improvement mechanism of the premixed turbulent combustion by preferential diffusion effect

Research Project

Project/Area Number 11450087
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

KIDO Hiroyuki  Kyushu University, Graduate School of Engineering, Professor, 大学院・工学研究院, 教授 (50037959)

Co-Investigator(Kenkyū-buntansha) NAKAHARA Masaya  Kyushu University, Graduate School of Engineering, Research Associate, 大学院・工学研究院, 助手 (20315112)
NAKASHIMA Kenshiro  Kyushu University, Graduate School of Engineering, Research Associate, 大学院・工学研究院, 助手 (60037869)
Project Period (FY) 1999 – 2001
KeywordsPremixed Turbulent Combustion / Local Burning Velocity / Flame Configuration / Preferential Diffusion / Laser Tomography / Inert Gas
Research Abstract

This study has been carried out the verification and determination qualitatively of the preferential diffusion effect, which becomes important particularly for the lean mixtures, on the premixed turbulent combustion. And, an attempt has been made to be proposed a new technique to improve the premixed turbulent combustion by application of the molecular preferential diffusion effect. In order to examine it, fuel/oxygen/inert-gas mixtures with nearly identical laminar burning velocities were used. The main conclusions are as follows.
From the instantaneous tomograms of turbulent flame, the turbulent flame areas at the same turbulence intensity are nearly equal, depending slightly on the kind of fuel and inert gas. This indicates that the local burning velocity is an important factor as governing the turbulent burning velocity.
From the continuous tomograms, the local flame displacement velocities of propagating turbulent flame S_F as local burning velocity are not a constant equal to the laminar burning velocity and distributed over a wide range. This fact seems to contradict the concept of the conventional models. And, S_F of hydrogen mixture tends to distribute more extended than one of hydrocarbon mixtures.
For leaner methane and hydrogen mixtures and richer propane mixtures, S_F on the convex part toward the unburned mixture tends to be larger than that toward the burned gas. This phenomenon can be explained qualitatively by the concept of the preferential diffusion. This indicates that the quantitative value of preferential diffusion effect can be determined by using S_F.
Judging from the results, a new technique to improve the turbulent combustion can be proposed : The turbulent combustion characteristics of fuel/oxygen/inert-gas mixtures can be improved by using the smaller molecule with higher diffusion coefficient than oxygen as fuel and the heavier molecule with lower diffusion coefficient than oxygen as inert gas.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Kido: "Effect of Preferential Diffusion on Turbulent Burning Velocity of Fuel/Oxygen/Inert Gas"Memoirs of Fac. of Engineering, Kyushu Univ.. Vol.59,No.3. 231-241 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "An Experimental Study on the Configurational Characteristics of Turbulent Propagating Flames"Proc. of the 4rd KSME-JSME Thermal Engineering Conference. Vol.3. 85-90 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 城戸 裕之: "メタン・プロパン・水素の二成分燃料混合気の乱流燃焼速度特性"日本機械学会論文集. 66-651B. 3021-3026 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 城戸 裕之: "乱流予混合火炎の形状・伝ぱ特性に関する実験的検討"自動車技術会論文集. Vol.32,No.1. 11-16 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "Experimental study on the configuration and propagation characteristics of premixed turbulent flame"JSAE Review. Vol.22,No.2. 131-138 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "Experimental Study on Turbulent Burning Velocities of Two-Component Fuel Mixtures of Methane, Propane and Hydrogen"Proc. of the Third Asia-Pacific Conference on Combustion. 299-302 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "An Experimental Study on the Local Configuration of Premixed Turbulent Flame"Proc. of COMODIA 2001. 238-244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "Turbulent Burning Velocities of Two-Component Fuel Mixtures of Methane, Propane and Hydrogen"JSME International Journal. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kido: "Effect of Preferential Diffusion on Turbulent Burning Velocity of Fuel/Oxygen/Inert Gas"Memoirs of Fac. of Engineering, Kyushu Univ.. Vol.59, No.3. 231-241 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kido: "An Experimental Study on the Corifigurational Characteristics of Turbulent Propagating Flames"Proc. of the 4th KSME-JSME Thermal Engineering Conference. Vol. 3. 85-90 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kido: "Experimental study on the configuration and propagation characteristics of premixed turbulent flame"JSAE Review. Vol.22, No.2. 131-138 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kido: "Experimental Study on Turbulent Burning Velocities of Two-Component Fuel Mixtures of Methane, Propane and Hydrogen"Proc. of the Third Asia-Pacific Conference on Combustion. 299-302 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kido: "An Experimental Study on the Local Configuration of Premixed Turbulent Flame"Proc. of COMODIA 2001. 238-244 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kido: "Turbulent Burning Velocities of Two-Component Fuel Mixtures of Methane, Propane and Hydrogen"JSME International Journal. (in print). (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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