| 引用本文: | 周星,张炜,杨栋,等.基于动力学和扩散分段控制的Mg/H2O反应模型及数值分析.[J].国防科技大学学报,2011,33(1):35-38.[点击复制] |
| ZHOU Xing,ZHANG Wei,YANG Dong,et al.Numerical Analysis of Reaction Characteristics of Mg with Vapor Based on Diffusional and Chemical Dynamic Control[J].Journal of National University of Defense Technology,2011,33(1):35-38[点击复制] |
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| 基于动力学和扩散分段控制的Mg/H2O反应模型及数值分析 |
| 周星, 张炜, 杨栋, 鲍桐, 姚汝亮 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 为了数值研究宽广温度范围内Mg/H2O的反应特性，分别建立了考虑部分MgO在液滴表面凝聚的Mg/H2O扩散燃烧模型和基于Arrhenius公式的Mg/H2O反应动力学模型。数值研究了Mg/H2O反应速率在扩散控制和化学动力学控制下随反应条件变化的规律。研究结果表明，Mg液滴扩散燃烧时间计算结果与文献值相符；提高温度和水蒸汽浓度有利于扩散燃烧速率增大，增大压强使燃速降低。不同温度段Mg/H2O反应速率控制因素不同，低温段反应速率受动力学控制，高温段反应速率受扩散控制。 |
| 关键词: 水冲压发动机 镁-水反应 扩散控制 化学动力学控制 |
| DOI： |
| 投稿日期：2010-10-15 |
| 基金项目:国家安全重大基础研究资助项目(613500103) |
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| Numerical Analysis of Reaction Characteristics of Mg with Vapor Based on Diffusional and Chemical Dynamic Control |
| ZHOU Xing, ZHANG Wei, YANG Dong, BAO Tong, YAO Ruliang |
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(College of Aerospace and Materials Engineering，National Univ. of Defense Technology，Changsha 410073，China)
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| Abstract: |
| In order to numerically study the reaction characteristics of magnesium and vapor in broad temperature range, the reaction model based on diffusional and chemical dynamic control respectively was established. The diffusional control model considered the partial condensation of gaseous MgO on the surface of magnesium droplet. The chemical dynamic model of Mg/H2O reaction was based on the Arrhenius equation. The reaction rate of Mg/H2O at different conditions was studied numerically. The results show that the calculated results are consistent with the experimental results. The reaction rate is great at high temperature and concentration of vapor, but low at high pressure. The reaction rate of magnesium and vapor is controlled by different factors at different temperature region. The reaction rate is controlled by chemical dynamic below the critical transition temperature, but by diffusional dynamic above the critical transition temperature. |
| Keywords: water ramjet Mg/H2O reaction diffusional control chemical dynamic control |
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