造雾剂燃烧过程研究及其对凝结核生长行为的影响(英文)

• 作 者: 代梦艳 胡碧茹 吴文健
• 机 构: 国防科技大学航天与材料工程学院材料工程与应用化学系,
• 出 处: 含能材料
• 发表日期: 2009年06期
• 关键词: 雾剂 生长行为 造雾剂 燃烧过程研究 热分析 热失重法 军事化学 热气 燃烧过程 凝结核

通过高速摄影技术拍摄造雾剂燃烧过程、利用热失重法(TG)、差示扫描量热法(DTA)、扫描电子显微镜(SEM)技术分析造雾剂的燃烧过程及其对凝结核生长行为的影响。测试结果和理论计算结果表明,造雾剂燃烧后生成携带高温凝结核的热气团,热气团上升过程中其内部温度和压力迅速下降。TG、DTA和SEM分析表明,造雾剂燃烧反应后产生的凝结核主要组分为NaCl,粒度分布范围为0.2~1μm。热气团在膨胀冷却过程中温度和压力瞬间变化而造成的巨大的过饱和度对凝结核的生长过程起到关键作用。

The combustion process of aerosol was shot by high-speed photographic technique. The combustion process of aerosol was analyzed by thermogravimetry (TG), differential scanning calorimetry (DTA) and scanning electron microscopy (SEM) Impact. The test results and theoretical calculations show that the aerosol generated by combustion aerosol can generate hot air masses with high temperature condensation nuclei, and the temperature and pressure inside the hot air mass decrease rapidly during the rising of the hot air mass. The results of TG, DTA and SEM showed that the main component of coagulation nucleus produced by the aerosol combustion reaction was NaCl, and the particle size distribution ranged from 0.2 to 1 μm. The huge supersaturation caused by the instantaneous change of temperature and pressure during the expansion and cooling of hot air mass plays a key role in the growth of condensed nuclei.