Shen Ye-Wei, Yang Mao-Fa, Zhang Hong-Guang, Huang Li-Ping, Xing Shu-Min, Zhang Xian-Ren, Luo Yi-Min, Xu Sen, Wu Xing-Liang
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, People's Republic of China.
Shanghai Space Propulsion Technology Research Institute, Huzhou, 313000, Zhejiang, China.
Sci Rep. 2025 Apr 15;15(1):12968. doi: 10.1038/s41598-025-97596-x.
Solid propellant slurry is a high solid content suspension, and its rheological properties are very complex. In order to solve the problem that it is hard to estimate the process propertie of 3,3-bis(azidomethyl) oxetane-tetrahydrofuran copolyether (PBT) solid propellant slurry, the concept of liquid film thickness in propellant was proposed by analyzing the mesoscopic structure of PBT solid propellant slurry, and the calculation method of liquid film thickness under different propellant packing grade ratios is given. Four kinds of filler particle size are used as examples, the theory of tight packing of tertiary particles was extended to multi-gradation. Furthermore, based on the theory of packing, the relationship between the liquid film thickness of the propellant and the particle size of the filler is obtained, that is, the liquid film thickness becomes thinner with the decrease of the particle radius and changes proportionally with the particle radius. In this work, the analysis method provides theoretical guidance for propellant formulation design, thereby reducing the number of experiments, shortening the propellant formulation development cycle, and reducing labor and material costs.
固体推进剂浆料是一种高固含量悬浮液，其流变特性非常复杂。为了解决3,3-双（叠氮甲基）氧杂环丁烷-四氢呋喃共聚醚（PBT）固体推进剂浆料过程特性难以预估的问题，通过分析PBT固体推进剂浆料的细观结构，提出了推进剂中液膜厚度的概念，并给出了不同推进剂堆积级配比下液膜厚度的计算方法。以四种填料粒径为例，将三次颗粒紧密堆积理论推广到多粒径级配。此外，基于堆积理论，得出推进剂液膜厚度与填料粒径的关系，即液膜厚度随颗粒半径减小而变薄，且与颗粒半径成比例变化。本工作中的分析方法为推进剂配方设计提供了理论指导，从而减少实验次数，缩短推进剂配方研发周期，降低人力和物力成本。
