Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Nonlinear Acoustic-Pressure Responses of H2/Air Counterflow Diffusion Flames

수소/공기 대향류 확산화염의 비선형 음향파 응답특성에 관한 연구

  • 김홍집 (한국항공우주연구원 엔진그룹) ;
  • 정석호 (서울대학교 기계항공공학부) ;
  • 손채훈 (조선대학교 항공우주공학과)
  • Published : 2003.08.01
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Abstract

Steady-state structure and acoustic-pressure responses of $H_2$/Air counterflow diffusion flames are studied numerically with a detailed chemistry in view of acoustic instability. The Rayleigh criterion is adopted to judge acoustic amplification or attenuation from flame responses. Steady-state flame structures are first investigated and flame responses to various acoustic-pressure oscillations are numerically calculated in near-equilibrium and near-extinction regimes. The acoustic responses of $H_2$/Air flame show that the responses in near-extinction regime always contribute to acoustic amplification regardless of acoustic-oscillation frequency Flames near extinction condition are sensitive to pressure perturbation and thereby peculiar nonlinear responses occur, which could be a possible mechanism in generating the threshold phenomena observed in combustion chamber of propulsion systems.

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References

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