A series of experiments was conducted to study the ignition and combustion characteristics of aluminum particle-laden flows in a propulsion system that used powder as the main fuel. In these experiments, a laminar flame produced by hydrocarbon fuel provided a high-temperature environment for the ignition and combustion of the aluminum particles. The effective oxidant content and flow velocity were adjusted by varying the mass flow rates of three gases (methane, air, and oxygen), and the ignition delay and burning time of the aluminum particles in the particle-laden flow were determined using a high-speed camera. The total time was the sum of the ignition delay time and burning time. The experimental results showed that the ignition delay time could be fitted as a function of the particle diameter, expressed as t_i = a₀ + b₀D; the burning time and total time could also be fitted as functions of the particle diameter, expressed as t_b = aD^b. As the effective oxidant content increased, the burning time decreased significantly, and the total time decreased slightly. The ignition delay time, burning time, and total time were obviously decreased with an increase in the flow velocity of the hot gas. Compared with the effective oxidant content, the flow velocity of the hot gas played a greater role in the reduction of the total time for the aluminum particles in a low-oxidant environment. The agglomeration and separation processes for the burning particles in aluminum particle-laden flows were analyzed in detail.

进行了一系列实验，以研究以粉末为主要燃料的推进系统中载有铝颗粒的流动的着火和燃烧特性。在这些实验中，由碳氢化合物燃料产生的层流火焰为铝颗粒的点火和燃烧提供了高温环境。通过改变三种气体（甲烷，空气和氧气）的质量流量来调节有效氧化剂含量和流速，并使用高比测速照相机。总时间是点火延迟时间和燃烧时间的总和。实验结果表明，点火延迟时间可以拟合为粒径的函数，表示为t_i = a ₀ + b ₀ D；燃烧时间和总时间也可以拟合为粒径的函数，表示为t _b = aD ^b。随着有效氧化剂含量的增加，燃烧时间明显减少，总时间略有减少。随着热气体流速的增加，点火延迟时间，燃烧时间和总时间明显减少。与有效氧化剂含量相比，在低氧化剂环境中，热气的流速对减少铝颗粒的总时间起着更大的作用。详细分析了载铝颗粒流中燃烧颗粒的团聚和分离过程。