Analysis of experimental data on the burning time of boron particles in a flat burner

The main part of available data on boron particles combustion was obtained in flat-flame burner experiments. Boron particles were injected into flat-flame burner post-flame zone with a transporting jet of cold nitrogen; the combustion process of boron particles was registered with a number of optical methods. Systematization of ignition delay and combustion times of boron particles obtained in that type of experiment was done. Combustion times are represented in the form of particles linear combustion speeds. Combustion speed shows classic dependence on temperature, at low temperatures the reaction is temperature dependent and seems to be kinetically controlled, at high temperatures the reaction is diffusion controlled one. Most of the combustion data was obtained in wet environment. Kinetically controlled combustion depends on surrounding gas temperature, so the heat generation doesn’t significantly heat the particle above the ambient temperature, such an effect is possible if heat release of the reaction on the surface of the particle is reduced. The boron oxide gasification process through formation on boric meta acid is studied. Equilibrium pressures are enough to provide observed in combustion experiments particles combustion rates.