探究微米铝颗粒群在不同环境低压下燃烧行为的控制机理
林诗泉 唐明轩 祝相开^{（通讯作者）}

西南交通大学物理科学与技术学院，四川成都，610031；

摘要：针对微米级铝颗粒群燃烧机理问题，基于自主构建的可控气氛激光点火同步测温诊断平台，结合光谱诊断与温度测量方法，系统研究了环境压强对颗粒点火与燃烧特性的影响规律。通过约束液滴法制备特定颗粒间距的单层铝颗粒样品，在保证氧化剂总量一致且充足的条件下，分别在不同压强环境中开展激光点火实验。以AlO自由基特征辐射作为燃烧诊断判据，提取点火延迟时间及燃烧持续时间等关键参数，并分析其演化规律。结果表明：随着环境压强降低，铝颗粒点火延迟显著增加，而燃烧持续时间明显延长，AlO辐射强度整体减弱。环境压强通过调节气体密度与对流强度，进而影响颗粒升温速率及氧化剂输运效率：高压强化对流作用，使点火提前、燃烧加快；低压削弱对流作用，导致点火滞后及燃烧过程延长。机理分析表明，在该颗粒间距条件下，颗粒间热耦合作用较弱，燃烧过程主要受外部气相对流以及主导的热质传递控制。

关键词：激光点火；环境压强；AlO辐射光谱

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