Combustion of Magnesium Wires with Oxygen and Water Vapor
Combustion of Magnesium Wires with Oxygen and Water Vapor
复制标题
镁丝与氧气和水蒸气的燃烧
DOI：
10.1080/00102202.2021.2019241
复制
发表时间：
2021
影响因子：
1.9
通讯作者：
Komurasaki Kimiya
中科院分区：
文献类型：
--
作者：
Nishii Keita;Akiyama Mariko;Koizumi Hiroyuki;Komurasaki Kimiya
镁与水的燃烧因其高的燃烧热和安全性而成为一种有吸引力的动力源。对于空间推进，线状镁被认为是一种燃料，它很容易被送入燃烧室。本研究的目的是获得航天器用镁丝在水和氧气中的燃烧特性，以便与燃烧行为进行比较。我们使用了一根直径0.5毫米的电线作为燃料，长度为40或50毫米。在一个封闭的燃烧室中，电流加热金属丝，氧化剂将其加压在10-100kPa.这些电线继续加热，直到断裂，然后将行为分为自燃和不燃烧两种情况。这一结果揭示了可持续燃烧的临界条件，这与热点火理论中的点火温度相同。在水蒸气的情况下，导线的断丝温度低于在氧气的情况下，这表明气体产物改变了导线的氧化膜。光谱测量得到了几个激发光谱和燃烧温度，这是由连续光谱计算出来的。在与水反应中，测得的燃烧温度低于氧化镁的熔点。结果，氧化物沉积在表面，形成了特有的纤维状，而不是分散的。
The combustion of magnesium with water is an attractive power source because of the high combustion enthalpies and safety of the materials. For space propulsion, wire-shaped magnesium, which is easy to be fed to the combustion chamber, is considered to be used as a fuel. This study aims to obtain the combustion characteristics of magnesium wire with water for use in spacecraft and oxygen for comparison to combustion behavior. We used a 0.5 mm diameter wire with a length of 40 or 50 mm as fuel. An electric current heated the wire in an enclosed combustion chamber pressurized at 10–100kPa by the oxidizers. The wires continued to be heated until they broke, and then the behaviors were divided into cases where they self-combusted and cases where combustion did not occur. This result revealed the critical conditions of sustainable combustion, which is the same as the ignition temperature in thermal ignition theory. In the case of water vapor, the wire breakage temperature was lower than that in the oxygen case, suggesting that the gaseous products altered the oxide film of the wire. The spectroscopic measurements obtained several excitation spectra and the combustion temperature, which is calculated from a continuous spectrum. In the reaction with water, the measured combustion temperature was lower than the melting point of MgO. As a result, the oxides were deposited on the surface and formed a characteristic fibrous shape rather than dispersed.