基于多层氧化层结构的硼颗粒点火模型研究
发布时间：2019-05-07 21:18
【摘要】：为了研究相关因素对硼颗粒点火过程的影响规律,基于多层氧化层结构,改进了硼颗粒的点火模型。该模型考虑了颗粒氧化层表面物质成分的变化、表面火焰面形成的物理过程,模型计算结果与实验数据具有较高的吻合度。应用该模型研究了环境压强、颗粒直径、气相氧化剂浓度以及环境温度对硼颗粒点火过程的影响规律。结果表明,环境压力越大,颗粒点火时间越短;颗粒粒径越大,颗粒表面氧化层越厚,从而延长了颗粒的点火时间;在较大颗粒直径(5μm)下增加环境内氧气浓度有利于颗粒点火,对小颗粒直径(≤5μm)则无明显影响;水蒸气浓度越大,颗粒点火时间越短;环境温度越高,越有利于颗粒点火。
[Abstract]:In order to study the influence of related factors on the ignition process of boron particles, the ignition model of boron particles was improved on the basis of multi-layer oxide structure. The model takes into account the physical process of the formation of flame surface and the change of material composition on the surface of the particle oxide layer. The calculated results of the model are in good agreement with the experimental data. The effects of ambient pressure, particle diameter, gas-phase oxidant concentration and ambient temperature on the ignition process of boron particles were studied by using the model. The results show that the larger the ambient pressure is, the shorter the ignition time is, the larger the particle size is, the thicker the oxide layer on the surface of the particle is, thus prolonging the ignition time of the particle. Increasing oxygen concentration in the environment at larger particle diameter (5 渭 m) is beneficial to particle ignition, but has no obvious effect on small particle diameter (鈮，
本文编号：2471391
[Abstract]:In order to study the influence of related factors on the ignition process of boron particles, the ignition model of boron particles was improved on the basis of multi-layer oxide structure. The model takes into account the physical process of the formation of flame surface and the change of material composition on the surface of the particle oxide layer. The calculated results of the model are in good agreement with the experimental data. The effects of ambient pressure, particle diameter, gas-phase oxidant concentration and ambient temperature on the ignition process of boron particles were studied by using the model. The results show that the larger the ambient pressure is, the shorter the ignition time is, the larger the particle size is, the thicker the oxide layer on the surface of the particle is, thus prolonging the ignition time of the particle. Increasing oxygen concentration in the environment at larger particle diameter (5 渭 m) is beneficial to particle ignition, but has no obvious effect on small particle diameter (鈮，
本文编号：2471391
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