Combustion of Large Aluminium Agglomerate Particles in Air. III. Particle Fragmentation
O. G. Glotov1,2, N. S. Belousova1,2, G. S. Surodin3
1Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
3Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences
Keywords: aluminum agglomerate, diameter, combustion in free fall in air, fragmentation
Abstract
The combustion of aluminum agglomerate particles with a diameter of 215 ÷ 840 μm in free fall in air at atmospheric pressure is investigated. The main events of the particle combustion process after their exit from the sample into the air --- change from symmetrical combustion to asymmetrical, fragmentation, end of combustion --- are characterized by the corresponding times. Approximating dependences on the particle diameter are obtained for the characteristic times of the symmetrical combustion stage, the beginning of fragmentation, the end of fragmentation, and the end of combustion. The characteristics of particle fragmentation are determined. Data are given on the relative number of parent agglomerate particles emitting a certain number of fragments, and on the dependence of the number of fragments on the diameter of the burning particle. For larger particles, fragmentation begins later, but proceeds more intensively. In general, the observed spontaneous fragmentation of aluminum agglomerates is insignificant, therefore, in order to reduce their combustion time, a targeted intensification of the fragmentation process is necessary.
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