Flame propagation and temperature distribution characteristics of magnesium dust clouds in an open space

Abstract

In order to explore the flame propagation behaviors and temperature characteristics of magnesium dust clouds, the measurement system and the two-color pyrometer technique were used to study the spatial-temporal distribution of flame temperature fields and flame propagation behaviors with different particle sizes. The experiment results showed that the flame propagation characteristics largely depended on the particle size and the flame propagation velocity was higher with decreasing particle sizes. The flame temperatures of the leading edges were kept stable between 3100 and 3300 K, and the average flame temperature was related to the dust concentrations and particle sizes. The average flame temperature of −400 mesh magnesium with 830 g/m3 dust concentration was the highest, and the descent speed of the average flame temperature had a negative correlation with the particle size. The two-color pyrometer technique could evaluate the severity of magnesium dust clouds explosion, which provides a theoretical basis for the prevention.