Reaction kinetics of an Mg/CO2 power system for Mars exploration
Reaction kinetics of an Mg/CO2 power system for Mars exploration
复制标题
用于火星探测的 Mg/CO2 动力系统的反应动力学
DOI：
10.1016/j.actaastro.2021.12.029
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发表时间：
2021-12
影响因子：
3.5
通讯作者：
Chunbo Hu
中科院分区：
文献类型：
--
作者：
Xiaofei Zhu;Yang Li;Peng He;Feng Ren;Zhaoming Sha;Xu Hu;Chunbo Hu
采用热分析动力学和量子化学计算方法分别研究了Mg/CO2和Mg/CO共存体系的非均相和均相反应特性。相应的动力学参数随后得到使用详细的理论计算。由于火星大气中丰富的二氧化碳资源，Mg/CO2动力系统是未来火星探测的一种非常有前途的推进方式。目前，镁在CO2中燃烧的研究主要集中在宏观着火和燃烧特性上，而微观反应特性的数据库很少。在CO2和CO气氛中进行了三组不同升温速率下的热分析实验，以提取动力学参数。结果表明，Mg与CO2/CO的非均相反应符合一级反应模型（F1），即线性动力学。Mg与CO2的均相反应存在两个中间过渡态，而Mg与CO2的均相反应没有发现合适的过渡态结构，该反应的总能垒明显高于Mg/CO2反应体系.在Mg沸点~ 2000 K温度范围内，Mg/CO_2均相反应的速率常数比Mg/CO均相反应的速率常数高10-17个数量级。研究结果对Mg/CO2系统燃烧模型的建立具有一定的参考价值，可为火星探测用Mg/CO2火箭发动机或燃烧室的结构设计和优化提供参考。
This study investigates the heterogeneous and homogeneous reaction characteristics of the Mg/CO2and coexisting Mg/CO systems using thermal analysis kinetics and quantum chemical calculation methods, respectively. The corresponding kinetic parameters are subsequently obtained using detailed theoretical calculations. The Mg/CO2power system is a very promising propulsion mode for future Mars exploration due to the abundant carbon dioxide resources in the atmosphere of Mars. At present, much of the research on Mg combustion in CO2has focused on the ignition and combustion characteristics at the macro level and few databases exist for microreaction characteristics. Three sets of thermal analysis experiments at different temperature rise rates are carried out in CO2and CO atmospheres to extract the kinetic parameters. The results show that the heterogeneous reactions between Mg and CO2/CO are controlled by the first-order reaction model (F1), that is, by linear kinetics. There are two intermediate transition states in the homogeneous reaction between Mg and CO2.However, a suitable transition state structure is not observed in the homogeneous reaction between Mg and CO. The total energy barrier of this reaction is significantly higher than that of the Mg/CO2reaction system. In addition, the rate constant of the Mg/CO2homogeneous reaction is 10–17 orders of magnitude higher than that of the Mg/CO homogeneous reaction in the temperature range between the boiling point of Mg and 2000 K. The conclusions of this study are valuable for the combustion models of Mg/CO2systems, which are expected to contribute to the structural design and optimisation of Mg/CO2rocket engines or burners for Mars exploration.
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影响因子：
3.5
作者：
V. Babuk;N. Budnyi
通讯作者：
V. Babuk;N. Budnyi
影响因子：
5.6
作者：
F. Arias;S. Heras
通讯作者：
F. Arias;S. Heras
DOI：
10.1016/s0082-0784(06)80804-0
发表时间：
1992
期刊：
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影响因子：
--
作者：
S. Yuasa;A. Fukuchi
通讯作者：
S. Yuasa;A. Fukuchi
DOI：
10.1007/bf00742263
发表时间：
1990-07
期刊：
Combustion, Explosion and Shock Waves
影响因子：
--
作者：
E. Shafirovich;U. I. Gol'dshleger
通讯作者：
E. Shafirovich;U. I. Gol'dshleger
DOI：
10.1007/bf00790146
发表时间：
1994
期刊：
Combustion, Explosion and Shock Waves
影响因子：
--
作者：
A. Valov;Yu. A. Kustov;V. Shevtsov
通讯作者：
A. Valov;Yu. A. Kustov;V. Shevtsov