Aluminum powder can increase the specific impulse and improve the combustion performance of a solid propellant; however, agglomeration can result in the loss of two-phase flow, a decrease in specific impulse of the propellant, and an increase in the thermal protection pressure of the motor structure. This study employs digital inline holography, which offers the advantage of non-contact three-dimensional measurements, to investigate the agglomeration particle size near the burning surface. This study aims to quantitatively analyze these particle size data to determine the effects of pressure, ammonium perchlorate particle size, coarse and fine ammonium perchlorate content ratio, and aluminum particle size on the agglomeration particle size distribution. The experimental results indicate that increasing the pressure from 0.1 MPa to 0.8 MPa reduces the average particle diameter of agglomeration by at least 9.6%, results in a more concentrated agglomeration particle size distribution, and decreases the volume and number proportion of agglomeration by approximately 7% and 17%, respectively. Furthermore, when the particle size of ammonium perchlorate decreases from 250 μm to 90 μm, the agglomeration particle size distribution becomes more concentrated, the average diameter of agglomeration decreases by at least 37.4%, and the number and volume proportion of agglomeration decrease by approximately 13% and 44%, respectively. The ratio of coarse and fine ammonium perchlorate content has a nonlinear effect on agglomeration. When this ratio is 0.6, the average agglomerate diameter decreases by at least 16%, the agglomeration particle size distribution is more concentrated than that the ratio is 0.39 and 1.29, and the agglomeration number and volume fraction decrease by more than 6% and 32%, respectively. Moreover, decreasing the initial aluminum particle size from 30 μm to 15 μm reduces the average agglomeration particle diameter by more than 21.6%, results in a more concentrated agglomeration particle size distribution, however, increases the number and volume proportion of agglomeration by approximately 17% and 8%, respectively. The conclusions of this study are expected to be significantly helpful in optimizing propellant formulation, reducing the particle size of aluminum agglomeration, and improving the combustion performance of propellants.

铝粉可以增加比冲，提高固体推进剂的燃烧性能；但团聚会导致两相流损失，推进剂比冲降低，电机结构热保护压力增加。本研究采用数字在线全息术，它提供了非接触式三维测量的优势，以研究燃烧表面附近的团聚粒径。本研究旨在对这些粒径数据进行定量分析，以确定压力、高氯酸铵粒径、高氯酸铵粗细含量比和铝粒径对团聚粒径分布的影响。实验结果表明，将压力从 0.1 MPa 增加到 0. 8 MPa使团聚平均粒径至少降低9.6%，团聚粒径分布更加集中，团聚体积和数量比例分别降低约7%和17%。此外，当高氯酸铵粒径由250 μm减小到90 μm时，团聚粒径分布更加集中，团聚平均直径至少降低37.4%，团聚数量和体积比例降低约13 % 和 44%，分别。高氯酸铵粗细比对团聚具有非线性影响。当该比率为 0.6 时，平均团聚体直径至少减少 16%，团聚粒径分布比0.39和1.29更集中，团聚数和体积分数分别下降6%和32%以上。此外，将初始铝粒径从 30 μm 降低到 15 μm，平均团聚粒径降低 21.6% 以上，导致团聚粒径分布更加集中，但团聚数量和体积比例增加了约 17%和 8%，分别。该研究结论对优化推进剂配方、降低铝团聚粒径、提高推进剂燃烧性能具有重要意义。分别。此外，将初始铝粒径从 30 μm 降低到 15 μm，平均团聚粒径降低了 21.6% 以上，导致团聚粒径分布更加集中，但团聚数量和体积比例增加了约 17%和 8%，分别。该研究结论对优化推进剂配方、降低铝团聚粒径、提高推进剂燃烧性能具有重要意义。分别。此外，将初始铝粒径从 30 μm 降低到 15 μm，平均团聚粒径降低了 21.6% 以上，导致团聚粒径分布更加集中，但团聚数量和体积比例增加了约 17%和 8%，分别。该研究结论对优化推进剂配方、降低铝团聚粒径、提高推进剂燃烧性能具有重要意义。使团聚的数量和体积比例分别增加了约 17% 和 8%。该研究结论对优化推进剂配方、降低铝团聚粒径、提高推进剂燃烧性能具有重要意义。使团聚的数量和体积比例分别增加了约 17% 和 8%。该研究结论对优化推进剂配方、降低铝团聚粒径、提高推进剂燃烧性能具有重要意义。