복사 열손실을 받는 대향류 확산화염의 맥동 불안정성의 비선형 거동
Nonlinear Behaviors of Pulsating Instabilities in Counterflow Diffusion Flames with Radiation Heat Loss
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초록
Nonlinear dynamics of pulsating instability in radiating counterflow diffusion flames is numerically investigated by imposing Damköhler number perturbation. Stable limit-cycle solutions occur in small ranges of Damköhler numbers past bifurcation point of instability. Period doubling cascade and chaotic behaviors appear just before dynamic extinction occurs. Nonlinear dynamics is also studied when large disturbances are imposed to flames. For weak steady flames, the dynamic extinction range shrinks as the magnitudes of disturbances are increased. However, strong steady flames can overcome relatively large disturbances, thereby the dynamic extinction range extending. Stable limit-cycle behaviors reappears prior to dynamic extinction when the steady flames are strong enough.
Abstract
Nonlinear dynamics of pulsating instability in radiating counterflow diffusion flames is numerically investigated by imposing Damköhler number perturbation. Stable limit-cycle solutions occur in small ranges of Damköhler numbers past bifurcation point of instability. Period doubling cascade and chaotic behaviors appear just before dynamic extinction occurs. Nonlinear dynamics is also studied when large disturbances are imposed to flames. For weak steady flames, the dynamic extinction range shrinks as the magnitudes of disturbances are increased. However, strong steady flames can overcome relatively large disturbances, thereby the dynamic extinction range extending. Stable limit-cycle behaviors reappears prior to dynamic extinction when the steady flames are strong enough.
참고문헌 (13)
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