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Molecular transport effects on turbulent flame propagation and structure

Andrei Lipatnikov (Institutionen för termo- och fluiddynamik) ; Jerzy Chomiak (Institutionen för termo- och fluiddynamik)
Progress in Energy and Combustion Science (2004)
[Artikel, refereegranskad vetenskaplig]

Abstract: Various experimental and DNS data show that premixed combustion is affected by the differences between the coefficients of molecular transport of fuel, oxidant, and heat not only at weak but also at moderate and high turbulence. In particular, turbulent flame speed increases with decreasing the Lewis number of the deficient reactant, the effect being very strong for lean hydrogen mixtures. Various concepts; flame instability, flame stretch, local extinction, leading point, that aim at describing the effects of molecular transport on turbulent flame propagation and structure are critically discussed and the results of relevant studies of perturbed laminar flames (unstable flames, flame balls, flames in vortex tubes) are reviewed. The crucial role played by extremely curved laminar flamelets in the propagation of moderately and highly turbulent flames is highlighted and the relevant physical mechanisms are discussed.



Denna post skapades 2006-08-25. Senast ändrad 2007-10-22.
CPL Pubid: 1693

 

Institutioner (Chalmers)

Institutionen för termo- och fluiddynamik (1989-2004)

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur