대한기계학회:학술대회논문집 (Proceedings of the KSME Conference)
- 대한기계학회 2003년도 추계학술대회
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- Pages.320-325
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- 2003
희석된 수소/공기 확산화염의 비정상 음향파 응답특성 해석
Unsteady Analysis of Acoustic-Pressure Responses of $N_{2}$ Diluted $H_{2}$ and Air Diffusion Flames
초록
Acoustic-Pressure Response of diluted hydrogen-air diffusion flames is investigated numerically by adopting a fully unsteady analysis of flame structures. In the low-pressure regime, the amplification index remains low and constant at low frequencies. As acoustic frequency increases, finite-rate chemistry is enhanced through a nonlinear accumulation of heat release rate, leading to a high amplification index. Finally, the flame responses decrease at high frequency due to the response lag of the transport zone. For a medium-pressure operation and low-frequency excitation, the amplification index is low and constant. It then decreases at moderate frequencies. As frequency increases further, the amplification index increases appreciably due to an intense accumulation effect.
키워드