Effects of ammonium perchlorate content on primary combustion performance and aluminum agglomeration of important components ammonium perchlorate/aluminum in aluminum-based fuel-rich propellants

doi:10.12034/j.issn.1009-606X.219193

Abstract

Abstract: The effects of ammonium perchlorate (AP) content on the combustion phenomena, ignition time, combustion diffusion time, burnout time, combustion efficiency, agglomeration phenomena of aluminum (Al) powder as well as the surface morphology and particle size distribution of condensed-phase combustion products in the primary combustion process of AP/Al were studied using a CO2 laser ignition system combined with a high speed photography system, SEM and other analysis techniques related to condensed-phase combustion products. The results showed that the primary combustion process of AP/Al mixture could be divided into three stages: surface ignition stage, combustion diffusion stage and flame extinction stage. However, there were significant differences in the combustion phenomena of each sample in different combustion stages. As the AP content increased from 10wt% to 30wt%, the burning intensity of the sample was enhanced, and the sputtering phenomenon of the solid-phase particles in the combustion process became more and more obvious, the combustion of each sample in the flame extinction stage was mainly changed from the combustion staying at the burning surface of the sample to the combustion of the sputtered particles, and the solid-phase particles that had burned at the burning surface of the sample were first extinguished with increasing the reaction time. The surface ignition time, combustion diffusion time and the combustion duration time decreased, indicating that the combustion reaction rate gradually increased. Meanwhile, as the AP content in the AP/Al sample increased, the combustion efficiency of Al powder increased. Additionally, the particle size of the condensed-phase products also increased, which indicated that the degree of agglomeration increased with the increase of the AP content in the AP/Al sample.

Key words: ammonium perchlorate, aluminum-based fuel-rich propellants, primary combustion

摘要： 采用CO2激光点火装置联合高速摄影系统及扫描电子显微镜等凝聚相燃烧产物分析技术，研究了高氯酸铵(AP)含量对高Al富燃料推进剂中重要组分AP/Al一次燃烧过程中燃烧现象、引燃时间、燃烧扩散时间、燃尽时间、燃烧效率、颗粒团聚及凝聚相燃烧产物的表面形貌、粒径及其分布的影响。结果表明，各AP/Al混合粉体的燃烧过程均可分为表面引燃、燃烧扩散和火焰熄灭3个阶段，但各样品在不同燃烧阶段的燃烧现象存在明显差异。AP含量由10wt%增至30wt%，样品燃烧剧烈程度增强，燃烧过程中固相颗粒的溅射现象越加明显；在火焰熄灭阶段，各样品燃烧由以停留在样品燃面处的燃烧为主逐渐变为以溅射颗粒的燃烧为主，且随反应进行，燃面已燃固相颗粒最先熄灭，各样品表面引燃时间、燃烧扩散时间、燃烧持续时间均缩短，即燃烧反应速率逐渐加快。在AP/Al混合物中，铝粉的燃烧效率、凝聚相燃烧产物粒度及其团聚程度随AP含量增加而增加。

关键词: AP, 高铝含量推进剂, 一次燃烧

Ying CHEN Yunlan SUN Baozhong ZHU Wei SHI Junchao XU. Effects of ammonium perchlorate content on primary combustion performance and aluminum agglomeration of important components ammonium perchlorate/aluminum in aluminum-based fuel-rich propellants[J]. Chin. J. Process Eng., 2020, 20(2): 197-204.

陈颖孙运兰朱宝忠石伟徐俊超. 高氯酸铵含量对高铝富燃料推进剂中重要组分高氯酸铵/铝一次燃烧性能和铝粉团聚的影响[J]. 过程工程学报, 2020, 20(2): 197-204.

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