Combustion Research // Premixed Combustion

Premixed flames propagate in a mixture of fuel and air due to heat conducted from the burned hot products to fresh cold reactants. Premixed combustion often occurs in a thin reaction zone separating reactants and products. Turbulent premixed flames are particularly complicated due to very strong coupling of the flame with the small-scale structure of  turbulence.

Intrinsic Disturbed Flame Equations (IDFE)

IDFE is a special asymptotic technique that is designed  to characterise the structure and propagation speed of premixed flames curved by a fluid flow. This technique uses a skillfully selected system of coordinates attached to the flame and basic tensor analysis. IDFE has been demonstrated to simplify dramatically the treatments of problems whose solutions are known and, at the same time, IDFE has been used to solve a series of previously unsolved problems in the area.  

Axiomatic formulation of the cascade hypothesis and the 4/7 power law

Effective propagation speed of turbulent premixed flames is very difficult to predict. The most notable effort to analyse and parameterise the known experimental data  for turbulent propagation speed has been undertaking by  Bradley, Lau and Lawes (1992, BLL). The axiomatic approach to cascade hypothesis in premixed turbulent combustion suggested by Klimenko (1998) results in the 4/7 power law that, as it is illustrated by the Figure, explains some of the behaviour observed in the BLL data