The behavior of aluminum particles during Al/AP propellant combustion is studied by 25 kHz high-speed digital off-axis holography and high-speed microscopic imaging. The advantage of off-axis holography is that the effects of the enveloping flame are suppressed, thereby, achieving better burning particle imaging. Three-dimensional dynamics of the aluminum particles from a series of time-resolved holograms are given in order to study the motion behaviors of particles during combustion. Typical processes, e.g., formation and change of the condensed phase products, micro-explosion behavior, and diameter ratio of enveloping flame and Al particle, are analyzed. This work provides a new 3D approach, that is, high-speed digital off-axis holographic imaging, for studying solid propellant combustion.

通过25 kHz高速数字离轴全息照相术和高速显微成像研究了Al / AP推进剂燃烧过程中铝颗粒的行为。离轴全息术的优点是抑制了包围火焰的影响，从而实现了更好的燃烧粒子成像。为了研究颗粒在燃烧过程中的运动行为，从一系列时间分辨全息图中给出了铝颗粒的三维动力学。分析了冷凝相产物的形成和变化，微爆炸行为以及包络火焰和Al颗粒的直径比等典型过程。这项工作为研究固体推进剂燃烧提供了一种新的3D方法，即高速数字离轴全息成像。