Flow Fields and Extinction of Stretched Cylindrical PremixedFlames

The flow fields were measured for the stretched cylindrical premixed flame and the counterflowtwin flames with stoichiometric methane-air mixtures using LOV. A quantitative comparison of the flowstructure was made based on the actual velocity gradients and flame stretch rates. The similarity betweenthe flow structures for both flame types was clarified over a wide range of velocity gradients. The extinctioncharacteristics were compared with each other and it was shown that the cylindrical flame was extinguishedat a lower velocity gradient and a lower stretch rate than the twin flames. The flame diameter of thecylindrical flame at the state of flame extinction was larger than the flame distance for the twin flames. Themechanism behind these characteristics was discussed from the view point of investigating the effects ofhigh curvature on the extinction for highly stretched flames.

[1]  Hideaki Kobayashi,et al.  Extinction characteristics of a stretched cylindrical premixed flame , 1989 .

[2]  B. Rogg.  Response and flamelet structure of stretched premixed methaneair flames , 1988 .

[3]  Hideaki Kobayashi,et al.  An Analysis of a Stretched Cylindrical Premixed Flame , 1988 .

[4]  C. Law,et al.  Propagation and extinction of stretched premixed flames , 1988 .

[5]  Hideaki Kobayashi,et al.  A Study on the Extinction of a Stretched Cylindrical Premixed Flame : Series B : Fluids Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties , 1987 .

[6]  S. Ishizuka.  On the behavior of premixed flames in a rotating flow field: Establishment of tubular flames , 1985 .

[7]  C. Law,et al.  On the determination of laminar flame speeds from stretched flames , 1985 .

[8]  Moshe Matalon,et al.  On Flame Stretch , 1983 .

[9]  C. Law,et al.  On the Opening of Premixed Bunsen Flame Tips , 1982 .

[10]  Hiroshi Tsuji,et al.  Structure and extinction of near-limit flames in a stagnation flow , 1982 .

[11]  T. Kawamura,et al.  Explanation of the blowoff of inverted flames by the area-increase concept , 1979 .

[12]  J. Buckmaster.  The quenching of a deflagration wave held in front of a bluff body , 1979 .

[13]  J. Chomiak.  Dissipation fluctuations and the structure and propagation of turbulent flames in premixed gases at high reynolds numbers , 1977 .

[14]  G. Sivashinsky,et al.  On a distorted flame front as a hydrodynamic discontinuity , 1976 .

[15]  S. B. Lwakabamba,et al.  Turbulence and turbulent flame propagation—A critical appraisal , 1975 .

[16]  Y. Otsuka,et al.  The Flammability Limits of Counter-Flow Premixed Flames , 1975 .

[17]  G. Andrews,et al.  The burning velocity of methane-air mixtures , 1972 .