• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1997 Fiscal Year Final Research Report Summary

The effects of volume expansion and laminarization on turbulent mixing in a diffusion flame

Research Project

Project/Area Number 08650256
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SHIOJI Masahiro  Kyoto Univ., Graduate School of Energy Science, Professor, エネルギー科学研究科, 教授 (80135524)

Co-Investigator(Kenkyū-buntansha) KAWANABE Hiroshi  Kyoto Univ., ibid, Instructor, エネルギー科学研究科, 助手 (60273471)
IKEGAMI Makoto  Kyoto Univ., ibid, Professor, エネルギー科学研究科, 教授 (70025914)
Project Period (FY) 1996 – 1997
KeywordsDiffusive Combustion / Turbulence Generation / Volume Expansion / Laminarization / Stability Analysis / Particle Image Velocimetry / Time Characteristics / Baroclinictorque
Research Abstract

This study aims at the clarification of the non-equilibrium process and turbulence generation in the diffusive combustion. The contents of the present study are summarized as follows :
1. Particle image velocimetry(PIV)for measuring velocity vectors was applied to the flow in a methane jet flame and a cold methane jet. Characteristics of turbulent eddies were clarified from the distribution of fluctuating velocity and vorticity. Results show that eddies generated inside flame front entrain the combustion products into the fuel stream, at the same time the dissipation of turbulence eddies takes place by the laminarization due to local heat-release.
2. Time-repetitive measurements of gas flow using cross-correlation particle image velocimetry is developed. The velocity vector is accurately estimated from the interpolated cross-correlation function. The application of this method to the flow in a methane jet flame and a nitrogen jet is demonstrated, and the distributions of the ensemble-averaged velocity and turbulence intensity are calculated from the change of velocity vectors with time. The results show that this method may successfully give the feasible information about turbulence characteristics.
3. Numerical simulation were performed to predict fluid motions induced by interactions between density and pressure gradients due to the presence of a vortex string situated in a deviated position from the jet flame axis. Deformation and stretching of the flame front take place once the vorticity production becomes stronger than the dissipation due to viscosity. When either the pressure gradient or the density gradient is high, the vorticity production proceeds at a high rate, which promotes the deformation of flame front and accelerates the heat release.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 川那 辺洋: "噴流火炎内乱れ特性のPIV計測" 第34回燃焼シンポジウム前刷集. 80-82 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塩路 昌宏: "相互相関PIVによるガス流動の時間的計測" 日本機械学会第74期通常総会講演会. 288-289 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Shioji: "PIV Measurement of Gas Flows in a Jet Flasme" Proc.of 'The 1st Asia-Pacific Conference on Co budion'. 306-309 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池上 詢: "拡散火炎面に及ぼす圧力・密度勾配の作用" 日本機械学会論文集(B編). 63-613. 3131-3136 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 塩路 昌宏: "高速度画像相互相関を用いた噴流火炎内ガス流動計測" 第35回燃焼シンポジウム前刷集. 386-388 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kawanabe: "PIV Measurements of the Turbulence Characteristics of a Jet Flame" Proc.of 34th Symp.(Japan)on Combust. 80-82 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Shioji: "Time-Repetitive Measurements of Gas Flow Using Cross-Correlation PIV" Proc.JSME Meeting. No.97-1. 288-289 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Shioji: "PIV Measurement of Gas Flows in a Jet Flame" Proc.of The 1st Asia-Pacific Conference on Combustion. 306-309 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ikegami: "Baroclinic Effect on Deformation of Diffusion Flame Front" Trans.JSME. 63-613, B. 3131-3136 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Shioji: "Flow measurements in a Jet Flame Using Cross-Correlation of High-Speed Particle Images" Proc.of 35th Symp.(Japan)on Combust. 386-388 (1997)

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

URL: 

Published: 1999-03-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi