Numerical Study on Dynamic Ignition and Combustion Characteristics of Magnesium Powder and Carbon Dioxide

被引：0

作者：

Li J.-J. ^{[1
]}

Xu Y.-H. ^{[1
]}

Gu X. ^{[1
]}

机构：

[1] Jiangxi Key Laboratory of Micro Aeroengine, School of Aircraft Engineering, Nanchang Hangkong University, Nanchang

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 06期

关键词：

Ignition and combustion; Mg/CO[!sub]2[!/sub; Oxygen-fuel ratio; Particle size; Reynolds number;

D O I：

10.13675/j.cnki.tjjs.200648

中图分类号：

学科分类号：

摘要：

Mg powder/CO2 powder engine is an ideal in-situ resource utilization scheme in Mars exploration. In order to master the stable ignition and combustion characteristics of Mg/CO2 powder engine, considering the flameout of Mg particles affected by the thickness of the oxide layer, the ignition and combustion model was established based on eddy dissipation / finite rate model. The effects of Mg particle size, Reynolds number of premixed flow and CO2/Mg oxygen-fuel ratio on dynamic ignition and combustion of Mg powder/CO2 were calculated by using the ignition combustion model, and the particle size of Mg powder was 5μm, 10μm, 15μm, 20μm and 25μm, the Reynolds number of inlet premixed gas was 1500, 2000, 2500, 3000 and 3500, and the CO2/Mg oxygen-fuel ratio was 0.5, 1, 1.5, 2 and 2.5. The numerical results show that at constant Reynolds number and oxygen-fuel ratio, with the increase of particle size from 5μm to 10μm, the average temperature increases, the average ignition time prolongs and the combustion efficiency increases. With the increase of particle size from 10μm to 25μm, the average temperature decreases, the average ignition time prolongs and the combustion efficiency decreases. At constant particle size and oxygen-fuel ratio, the average temperature decreases with the increase of Reynolds number, while the average ignition time and combustion efficiency remain unchanged with the increase of Reynolds number. At constant particle size and Reynolds number, with the increase of oxygen-fuel ratio from 0.5 to 1.5, the average temperature increases. With the increase of oxygen-fuel ratio from 1.5 to 2.5, the average temperature decreases. The average ignition time and combustion efficiency basically remain unchanged with the increase of oxygen-fuel ratio. © 2022, Editorial Department of Journal of Propulsion Technology. All right reserved.

引用

共 22 条

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