含铝固体复合推进剂颗粒团聚现象

秦文瑾; 邵宇; 王利坡; 齐观超; 严俊; 娄永春; 赵瑜

doi:10.13224/j.cnki.jasp.20210388

含铝固体复合推进剂颗粒团聚现象

doi: 10.13224/j.cnki.jasp.20210388

1.
上海理工大学机械工程学院，上海 200093
2.
上海交通大学密西根学院，上海 200240
3.
上海航天动力技术研究所，上海 201109

基金项目: 国家自然科学基金（51506118）

详细信息

作者简介:
秦文瑾（1981-），男，副教授、硕士生导师，博士，主要从事先进燃烧技术研究

中图分类号: V435
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-23
- 网络出版日期: 2023-09-12

Agglomeration phenomenon of aluminized solid composite propellant particles

1.
School of Mechanical Engineering，University of Shanghai for Science and Technology，Shanghai 200093，China
2.
University of Michigan-Shanghai Jiao Tong University Joint Institute，Shanghai Jiao Tong University，Shanghai 200240，China
3.
Shanghai Academy of Spaceflight Technology，Shanghai 201109，China

摘要

摘要:
含Al固体复合推进剂在燃烧过程中，燃烧表面存在Al颗粒团聚现象，其对火箭发动机性能产生重要影响。通过分子动力学算法建立固体复合推进剂三维颗粒微观模型，实现了模拟三维空间内AP颗粒和Al颗粒的随机分布特征。并建立了颗粒的团聚模型，分析研究Al颗粒在随机填充模型中的团聚现象，得到了不同的临界分离距离下Al颗粒粒径分布规律，并将之与实验数据进行对比，最终总结出了合适的临界分离距离与Al颗粒直径的经验公式。然后总结出了Al颗粒在气固交界面发生团聚后粒径的分布规律，设计了Al颗粒在气固交界面的Rosin-Rammler概率分布函数，分析得到其均匀性系数与特征系数分别为1.4453与86.49，可用于数值模拟计算固体燃料燃烧面退移过程中表面Al颗粒喷射的初始粒径。
- 固体复合推进剂 /
- 颗粒团聚 /
- 分子动力学 /
- 颗粒喷射 /
- 固体火箭
Abstract:
During the combustion process of solid composite propellants containing Al, a phenomenon of Al particle agglomeration on the combustion surface was found to have a significant impact on the performance of rocket engines. A three-dimensional particle microscopic model of solid composite propellants was established by using molecular dynamics algorithms to simulate the random distribution characteristics of AP and Al particles in three-dimensional space. And a particle aggregation model was established to analyze and study the aggregation phenomenon of Al particles in the random filling model. The distribution patterns of Al particle size under different critical separation distances were obtained, and compared with experimental data. Finally, the appropriate empirical formula for critical separation distance and Al particle diameter was summarized. Then, the distribution law of Al particle size after agglomeration at the gas-solid interface was summarized, and the Rosin Rammler probability distribution function of Al particles at the gas-solid interface was designed. The uniformity coefficient and characteristic coefficient were 1.4453 and 86.49, respectively, through analysis, which can be used for numerical simulation to calculate the initial particle size of surface Al particle injection during the retreat process of solid fuel combustion surface.
- solid composite propellant /
- particle agglomeration /
- molecular dynamics /
- particle injection /
- solid rocket

HTML

图 1 团聚流程图

Figure 1. Flow chart of agglomeration

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图 2 铝化AP/HTPB复合推进剂的随机填充模型

Figure 2. Random filling model of aluminized AP/HTPB composite propellant

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图 3 Al颗粒粒径分布图

Figure 3. Al particle size distribution diagram

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图 4 S_d=8 μm时铝颗粒粒径分布与实验数据对比图

Figure 4. Comparison of aluminum particle size distribution and experimental data when S_d=8 μm

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图 5 临界分离距离随Al颗粒初始粒径变化分布规律

Figure 5. Distribution of critical separation distance with the initial particle size of Al particles

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图 6 Al颗粒粒径分布图

Figure 6. Al particle size distribution diagram

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图 7 线性拟合

Figure 7. Linear fit

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图 8 累积分布函数随颗粒粒径的变化规律

Figure 8. Cumulative distribution function changes with particle size

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表 1 含铝复合推进剂配方组分

Table 1. Compositin of Al/AP/HTPB formulation

参数 HTPB AP Al

质量分数/% 14 68 18
密度/（g/cm³） 0.95 1.95 2.70
体积分数/% 26.11 61.99 11.90

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