| Summary: | 碩士 === 國立臺灣大學 === 機械工程學系 === 86 === The propagation of a premixed laminar flame in an adiabatic closed circular
tube is numerically investigated in this study. An axisymmetric flow is assumed
and a global one-step chemical reaction with reaction rate governed by the
Arrhenius law is adopted.
A comparison between the numerical results and the experimental results shows
that the numerical simulation can predict the flame transient behavior quite
well. The numerical results indicate that the cause of the tulip-shaped flame
formation is determined by the interaction between the hydrodynamics and
the Darrieus-Landau instability. Although the flame behaviors differ in closed
tubes with fixed tube aspect ratio, they are the same if the additional
condition of fixed tube diameter to the flame thickness ratio is enforced.
In this study, the effects on the flame development of the tube diameter,
the shape of the ignition source, the gravity and the rotating speed of
the tube are also investigated.
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