Effects of Finite Reaction Rate and Molecular Transport in Premixed Turbulent Combustion.
Technical scientific rept.,
PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS
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Previous application of the Bray-Moss model for premixed turbulent combustion to planar, oblique and normal flames is extended to include the effect of large but finite values of the two dominant characteristic numbers, a turbulence Reynolds number providing a measure of the intensity of the turbulence and a Damkoehler number relating a turbulence time to a chemical time. A classical perturbation analysis involving two small parameters proportional to the inverse of these two numbers is carried out to account separately for the effects of molecular transport and of altered scalar dissipation and for the effects of finite chemical reaction rates. Two limiting cases corresponding to highly oblique confined flames and normal or unconfined oblique flames are treated. Of particular interest in the former case is the effect of the perturbations of the predicted orientation of the turbulent reaction zone. For the unconfined flames attention focuses on the effect of the perturbations on the turbulent flame speed and on the change in turbulent kinetic energy across the reaction zone.
- Combustion and Ignition