Studies on aluminum powder combustion in detonation environment

The combustion mechanism of aluminum particles in a detonation environment characterized by high temperature (in unit 10(3) K), high pressure (in unit GPa), and high-speed motion (in units km/s) was studied, and a combustion model of the aluminum particles in detonation environment was established. Based on this model, a combustion control equation for aluminum particles in detonation environment was obtained. It can be seen from the control equation that the burning time of aluminum particle is mainly affected by the particle size, system temperature, and diffusion coefficient. The calculation result shows that a higher system temperature, larger diffusion coefficient, and smaller particle size lead to a faster burn rate and shorter burning time for aluminum particles. After considering the particle size distribution characteristics of aluminum powder, the application of the combustion control equation was extended from single aluminum particles to nonuniform aluminum powder, and the calculated time corresponding to the peak burn rate of aluminum powder was in good agreement with the experimental electrical conductivity results. This equation can quantitatively describe the combustion behavior of aluminum powder in different detonation environments and provides technical means for quantitative calculation of the aluminum powder combustion process in detonation environment.

Automated summary

The combustion mechanism of aluminum particles in a detonation environment characterized by high temperature, high pressure, and high-speed motion was studied. A combustion model and control equation for aluminum particles in this environment were established. The study found that the burning time of the particles is mainly influenced by their size, system temperature, and diffusion coefficient. Higher system temperature, larger diffusion coefficient, and smaller particle size result in faster burn rate and shorter burning time. The application of the combustion control equation to nonuniform aluminum powder showed good agreement with experimental results, providing a quantitative calculation method for the aluminum powder combustion process in detonation environment.