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http://dx.doi.org/10.3795/KSME-B.2003.27.8.1158

Nonlinear Acoustic-Pressure Responses of H2/Air Counterflow Diffusion Flames  

Kim, Hong-Jip (한국항공우주연구원 엔진그룹)
Chung, Suk-Ho (서울대학교 기계항공공학부)
Sohn, Chae-Hoon (조선대학교 항공우주공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.8, 2003 , pp. 1158-1164 More about this Journal
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.
Keywords
Acoustic-Pressure Responses; Hydrogen/Air Diffusion Flame; Nonlinear Response;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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