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Analysis of flame acceleration induced by wall friction in open tubes

V. Akkerman ; C. K. Law ; V. Bychkov ; Lars-Erik Eriksson (Institutionen för tillämpad mekanik, Strömningslära)
Physics of Fluids (1070-6631). Vol. 22 (2010), 5,
[Artikel, refereegranskad vetenskaplig]

Spontaneous flame acceleration leading to explosion triggering in open tubes/channels due to wall friction was analytically and computationally studied. It was first demonstrated that the acceleration is affected when the thermal expansion across the flame exceeds a critical value depending on the combustion configuration. For the axisymmetric flame propagation in cylindrical tubes with both ends open, a theory of the initial (exponential) stage of flame acceleration in the quasi-isobaric limit was developed and substantiated by extensive numerical simulation of the hydrodynamics and combustion with an Arrhenius reaction. The dynamics of the flame shape, velocity, and acceleration rate, as well as the velocity profile ahead and behind the flame, have been determined. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3425646]

Nyckelord: channel flow, chemically reactive flow, combustion, explosions, flames, friction, thermal expansion, large-eddy simulation, premixed flames, detonation, transition, turbulent, nonslip, sound, deflagration, instability, channels



Denna post skapades 2010-06-18. Senast ändrad 2015-07-09.
CPL Pubid: 122963

 

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Institutionen för tillämpad mekanik, Strömningslära

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Chalmers infrastruktur