微米级铝颗粒在水蒸气和氧气中的点火燃烧特性  

Ignition and combustion characteristics of micro-sized aluminum particles in H_(2)O and O_(2)

作　　者：胡泽君 冯运超[1] 何志成 夏智勋[1] 李明泰 HU Zejun;FENG Yunchao;HE Zhicheng;XIA Zhixun;LI Mingtai(College of Aerospace Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,长沙410073

出　　处：《航空学报》2023年第15期248-257,共10页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(52006240);湖南省自然科学基金(2021JJ30775)。

摘　　要：通过实验研究了单个微米级铝颗粒(50~160μm)在水蒸气和不同氧含量环境中的点火燃烧特性,通过铝颗粒的光学信息确定了其初始直径和火焰平均直径,划分了点火延迟时间和燃烧时间。铝颗粒的燃烧过程会发生多种不同的燃烧行为,颗粒破碎、喷射更易发生在温度更高的环境中,微爆更易发生在氧含量更高的环境中。提高环境温度和含氧量均可以减少颗粒的点火延迟时间,但是温度更高反而使颗粒的燃烧时间更长,这可能是高温氧化铝带走了颗粒大量的热量造成的。提高氧含量可以有效减少颗粒的燃烧时间,在弱氧化性环境中铝颗粒的燃烧集中在表面,并且难以完全燃烧,表面反应在燃烧过程中发挥了重要的作用。The ignition and combustion characteristics of single micro-sized aluminum particles(50-160μm)in water vapor and different oxygen contents are studied experimentally.The initial diameters and flame average diameters of the aluminum particles are determined by their optical information,and the ignition delay time and combustion time are divided.Different combustion behaviors will occur in the combustion process of aluminum particles.Particle fragmen⁃tation and injection are more likely to occur in the environment with higher temperature,and micro-explosion is more prevalent in the environment with higher oxygen content.Increasing the ambient temperature or oxygen content can reduce the ignition delay time of the particles,but the higher temperature makes the combustion time of the particles longer,which may be caused by the high temperature alumina taking away a lot of heat.Increasing the oxygen con⁃tent can effectively reduce the combustion time of the particles.In weak oxidation environment,the combustion of alu⁃minum particles is concentrated on the surface,and is difficult to burn completely.The surface reaction plays an im⁃portant role in the combustion process.

关 键 词：铝颗粒 微米级单颗粒 点火燃烧 水蒸气 氧气 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程]