Two approaches for visualizing reaction layers of flames a planar laser-induced fluorescence (PLIF) of CH radicals and the product of simultaneously acquired PLIF images of OH radicals and CH2O to produce "overlap layers" were compared. Evaluation of both thin and thickened CH- and overlap layers in four flames of different turbulence intensities showed that average overlap- and CH-layer thickness exhibit the same trend with increasing turbulence levels. Additionally flame surface density profiles from both techniques agreed well showing similar magnitude values and decay rates with increasing distance from centerline. Results showed that CH-PLIF images can be acquired at a rate of 10 kHz within extremely turbulent flames thus quantifying the rate of flamelet-merging which is a significant quantity in models of turbulent premixed combustion.
- Hi-pilot burner
- Reaction layer imaging
- Turbulent premixed combustion
ASJC Scopus subject areas
- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry