Abstract
During the production and process of Al-Mg alloy in industrial, long-term dust accumulation poses highly explosion hazard. To investigate the deflagration pressure and flame parameter of Al-Mg alloy dust, experiments were conducted in an 18 L visualized tube at ambient temperature and pressure. The method of two-color pyrometry was employed to reconstruct the flame temperature distribution during the explosion process. The results indicated that both the peak explosion pressure Pmaxand the maximum rate of increase of explosion pressure (dP/dt)max increased and then declined as the dust concentration increases. In the course of flame propagation, the initial flame front manifested an irregular shape with a pale yellow hue. In the concentration interval of 500-800 g/m3, the flame front manifested as either "spherical" or "finger-shaped," exhibiting a bright yellow-white hue. When the concentration rose, the flame front thickened with poor continuity and turned orange-yellow. The temperature of the flame front increased sharply, and the peak temperature in the flame core region reached 3400 degrees C at a dust concentration of 600 g/m3. After reaching the maximum temperature, it gradually declined. The findings of this study could offer a theoretical foundation for the prevention, mitigation, and suppression of metal dust explosions.