A Numerical Study of Flame Propagation in an Adiabatic Closed Tube

• Main Authors: Ciang, Wen-Dong, 張文東
• Other Authors: Shin-Tuen Lee
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/99890911620984791156

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.