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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。
In order to study the reaction characteristics of Mg / H2O in a wide range of temperature numerically, the Mg / H2O diffusion combustion model and the Mg / H2O reaction kinetics model were established respectively considering the partial condensation of MgO on the droplet surface. The laws of Mg / H2O reaction rate changing with reaction conditions under diffusion control and chemical kinetics were numerically investigated. The results show that the calculation results of diffusion and burning time of Mg droplets are consistent with the literatures. Increasing the temperature and water vapor concentration will increase the diffusion combustion rate and increase the pressure to reduce the burning rate. Different temperature Mg / H2O reaction rate control factors are different, the low temperature reaction rate is controlled by the kinetics, high temperature reaction rate diffusion controlled.