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Flame acceleration in the early stages of burning in tubes

V. Bychkov ; V. Akkerman ; G. Fru ; A. Petchenko ; Lars-Erik Eriksson (Institutionen för tillämpad mekanik)
Combustion and Flame (0010-2180). Vol. 150 (2007), 4, p. 263-276.
[Artikel, refereegranskad vetenskaplig]

Acceleration of premixed laminar flames in the early stages of burning in long tubes is considered. The acceleration mechanism was suggested earlier by Clanet and Searby [Combust. Flame 105 (1996) 225]. Acceleration happens due to the initial ignition geometry at the tube axis when a flame develops to a finger-shaped front, with surface area growing exponentially in time. Flame surface area grows quite fast but only for a short time. The analytical theory of flame acceleration is developed, which determines the growth rate, the total acceleration time, and the maximal increase of the flame surface area. Direct numerical simulations of the process are performed for the complete set of combustion equations. The simulations results and the theory are in good agreement with the previous experiments. The numerical simulations also demonstrate flame deceleration, which follows acceleration, and the so-called '' tulip flames.'' (c) 2007 Published by Elsevier Inc. on behalf of The Combustion Institute.

Nyckelord: premixed flames, flame acceleration, tulip flames, direct numerical, simulations, HYDRODYNAMIC INSTABILITY, NUMERICAL-SIMULATION, CYLINDRICAL-TUBES, WEAKLY TURBULENT, CURVED FLAMES, VELOCITY, DETONATION, DYNAMICS, NONSLIP, WALLS



Denna post skapades 2009-01-19.
CPL Pubid: 88499

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur