The flame propagation, stretching, and global quenching in terms of straining rates for premixed turbulent combustion were studied. A new methodology was presented which was based upon downward propagating premixed CH4/air and/or C3H8/air flames through a nearly isotropic turbulent flow with very high intensities. The burner includes two vessels with a cruciform shape. The long vertical vessel provided a stable downward propagating premixed flame, while the horizontal vessel was equipped with a pair of counter-rotating fans and perforated plates at each end to generate high-intensity (near) isotropic turbulence. The improvements were that flame-turbulence interactions were not affected by the ignition source and the unwanted turbulence from walls and effects of buoyancy and pressure rise due to burning were minimized. Velocity profiles and visualization of turbulent flame fronts were achieved from laser Doppler velocimetry and high-speed laser sheet imaging, respectively. Turbulent burning velocities of both methane-air and propane-air mixtures were quantitatively measured over a greater parameter range than hitherto. Both the turbulent burning velocity bending and the vitality of turbulent premixed flames were certain and surprising. Original is an abstract.
|Number of pages||1|
|Journal||International Symposium on Combustion Abstracts of Accepted Papers|
|State||Published - 2000|
|Event||28th International Symposium on Combustion - Edinburgh, United Kingdom|
Duration: 30 Jul 2000 → 4 Aug 2000