Ignition and combustion characteristics of single gas-atomized Al–Mg alloy particles in oxidizing gas flow. (1st April 2020)

• Record Type: Journal Article
• Authors: Feng, Yunchao; Ma, Likun; Xia, Zhixun; Huang, Liya; Yang, Dali
• Is Part Of: Energy. Volume 196(2020)
• Publication Date: 2020-04-01
• Subjects: Aluminum alloy particle -- Ignition delay time -- Combustion time -- Oxidizing gas flow -- Microexplosion; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.117036
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: Ignition and combustion characteristics of single gas-atomized Al–Mg alloy particles (Al:Mg = 1:1, 20–210 μm) have been studied in the context of improving the ignition and combustion performance of metal additives in composite solid propellants. In this study, a series of experimental conditions with different oxygen contents and temperatures was designed to examine their effects on the ignition and combustion times of single-alloy particles. The particle sizes, ignition delay times, combustion times, and total times of single-alloy particles were measured synchronously using a two-camera system. Experimental results indicate that the time parameters of single-alloy particles are linearly increased with particle diameters in each experimental condition. Blocked by the oxide film, the alloy particles have a relatively long ignition delay time when they are ignited in high-oxygen-content environments. However, the combustion time of alloy particles decreases as the environmental oxygen content increases. High ambient temperature can remarkably shorten the ignition delay time and total time, but its influence on the combustion time is limited. Microexplosion is also monitored during the ignition and combustion processes. Because of this phenomenon, the combustion times and total times of alloy particles are much shorter than those of same-sized aluminum particles. Highlights: Three typical kinds of microexplosion have been observed and analyzed. The ignition delay time is extended in the environment with a high oxygen content. Ambient temperature has a significant influence on particle ignition delay time. The combustion time of alloy particle is shorter than that of aluminum particle.