Oscillating combustion characteristics of micro-aluminum powder in sound field

To understand the combustion characteristics of aluminum powders in the sound field, a methane flat burner was established. The combustion experiment of micro-aluminum powders was carried out by an external horn to generate oscillation. The distribution and combustion response characteristics of aluminum powder under different oscillating frequency and the combustion characteristics and damping characteristics of products for aluminum powder with particle size of 10, 20, 30μm were studied. The results show that when the oscillation frequency changes, the gain effect of the aluminum powder combustion to the oscillating pressure is different, the gain effect of 20μm aluminum powder combustion is obvious when the oscillation frequency is 200Hz and 300Hz. The larger the particle size, the greater the gain of distribution combustion. The damping of aluminum powder with the particle size of 10 μm to high-frequency oscillation of burner is the maximum. With increasing the particle size of aluminum, the damping of combustion product particles on high frequency pressure oscillation reduces.