Accession Number : AD0672688

Title :   MASS EXCHANGE DURING BURNING OF CONDENSED MIXTURES (MASSOOBMEN PRI GORENII KONDENSIROVANNYKH SMESEI),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Bakhman,N. N.

Report Date : 19 SEP 1967

Pagination or Media Count : 12

Abstract : An evaluation was made of the effect of the solid propellant particle size on the burning velocity. Kinetic and diffusional combustion regimes are considered, and it is shown that when the oxidizer-fuel interface is divided by a thin polymer film, the burning velocity can be either decreased (polyterephthalate or polyfluoroethylene) or increased (polyethylene). These experiments made with plexiglass-KClO4 showed that kinetic factors are also important when the diameter of the gasifying component approaches infinity. The effect of turbulent diffusion of the gasifying component becomes more pronounced as the particle size increases. It is concluded that the dependence of the burning velocity on the particle size is less pronounced with components which are gasified in the pre-reaction zone. When the particle size is sufficiently small, mixing is completed in the pre-reaction zone, and, therefore, the burning velocity becomes independent of the particle size, and the combustion takes place in a purely kinetic regime.

Descriptors :   (*COMBUSTION, MASS TRANSFER), FUELS, SOLIDS, OXIDIZERS, PROPELLANTS, PYROTECHNICS, PARTICLE SIZE, INTERFACES, FILMS, POLYMERS, BURNING RATE, VAPORIZATION, STABILITY

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE