微重力环境金属燃烧试验研究进展

Experimental research progress in combustion of metal under microgravity

以自由落体、抛物线飞行和模拟微重力流场3种典型的微重力试验原理,综述了微重力环境下气溶胶、颗粒和棒状3种形态的金属材料燃烧研究,包括镁、铝、钛等。详细介绍了微重力对金属燃烧速度、火焰结构、相变过程及特有的燃烧现象等特性的影响机理,阐述了微重力环境对揭示金属燃烧固有属性的优势,综述了现有微重力试验系统的优缺点和模拟微重力流场方法的可行性。研究结果表明:由于创造微重力环境较难且成本较大,限制了金属燃烧固有属性及弱效应对其影响的研究。建议从微重力试验条件、弱效应对金属燃烧行为的影响、微重力下传热传质变化对燃烧化学反应的微观影响机理方面进一步研究。

The combustion characteristics of metal aerosols,particles,and rods in a microgravity environment were reviewed based on three typical microgravity experiment methods,including free fall, parabolic flight, and simulating microgravity flow field. The metals include magnesium,aluminium,titanium and so on. The influence mechanism of microgravity on metal combustion speed,flame structure,phase transition process,and unique combustion phenomena was introduced in detail. The advantages of the microgravity environment in revealing the inherent properties of metal combustion were described. The advantages and disadvantages of existing microgravity experimental system and the feasibility of simulating the microgravity flow field were summarized. Results showed that the researches on the inherent properties of metal combustion and the influence of weak effects were limited due to the costly and uncommon microgravity environment. It is suggested to further investigate the microgravity experimental methods,the influence of weak effects on the combustion characteristics of metals, and the microscopic influence mechanism of heat and mass transfer changes on combustion chemical reactions under microgravity.