Propagation of Flat Flame Front in Air-Dispersed Systems,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The rate of flame propagation in a suspension of solid burning particles in air is usually one order higher than the flame propagation rate in a homogeneous gas mixture. This is caused by the difference in the mechanism by which the still cold volume which lies ahead is heated by the flame front. For an air suspension heating is achieved not by the conductive, but by the radiative component of the heat flux from the flame front, for which the homogeneous burning mixture is practically transparent. The suspended particles of the aerosol intensively absorb almost like a black body the radiative heat and partially warm the gas surrounding them by conduction. In order to clarify the influence of the concentration and dispersion of the aerosol and of the other parameters from flame velocity and the stability of the front the authors introduce further refinements into the simplest relationships of Nusselt.
- Combustion and Ignition