Study on Enhanced Combustion by Mixed Loading of Combustible Cartridge Case and Propellant

To systematically investigate the combustion characteristics of combustible cartridge cases and propellants under various charge configurations, an experimental study was conducted employing two novel combustible cartridge cases (designated as K1 and K2) and two distinct propellants (F1 and F2). The research focused on analyzing the structural properties of the combustible cartridge cases, as well as evaluating their combustion behavior, thermal decomposition characteristic, and interior ballistic performance across different charge architectures. Results demonstrate that the novel combustible cartridge case features a porous structure, which significantly enhances its combustion efficiency and leads to an irregular osmotic combustion process. Closed-bomb tests reveal that the K1+F1 combination achieves a peak pressure of 205.6 MPa under equal-proportion mixing, which is superior to other combinations. Additionally, increasing the proportion of combustible cartridge cases improves the pressure rise rate during the initial combustion phase and accelerates the attainment of peak pressure. Ignition experiments and thermal decomposition analyses indicate that, compared to single-propellant systems, the composite charge structure exhibits a more intense but shorter combustion process with higher energy release, albeit with a slight reduction in thermal stability. Interior ballistic tests conducted at varying temperatures confirm the stable performance of the composite charge structure comprising combustible cartridge case K1 and propellant F1, with further performance enhancements observed at elevated temperatures. These findings provide valuable insights for the design and optimization of large-caliber gun charge systems, highlighting the importance of charge configuration in achieving desired combustion and ballistic performance.

为系统探究可燃药筒（combustible cartridge cases）与发射药（propellants）在多种装药构型下的燃烧特性，本研究采用两款新型可燃药筒（编号为K1与K2）以及两种不同发射药（编号为F1与F2）开展了实验研究。研究重点围绕可燃药筒的结构特性展开分析，并对不同装药结构下的燃烧行为、热分解特性与内弹道性能（interior ballistic performance）进行了系统评估。实验结果显示，该新型可燃药筒具备多孔结构，可显著提升其燃烧效率，并催生不规则的渗透燃烧过程。密闭爆发器试验（closed-bomb tests）结果表明，等比例混合的K1+F1组合可达到205.6 MPa的峰值压力，性能优于其余装药组合。此外，提高可燃药筒的占比可提升燃烧初始阶段的压力上升速率，并加快峰值压力的到达时刻。点火实验与热分解分析表明，相较于单一发射药体系，复合装药结构的燃烧过程更剧烈但持续时长更短，能量释放效率更高，不过热稳定性存在小幅下降。变温度条件下的内弹道测试证实，由可燃药筒K1与发射药F1组成的复合装药结构性能稳定，且在高温环境下其性能还可得到进一步提升。上述研究结果为大口径火炮装药系统的设计与优化提供了极具价值的参考依据，同时凸显了装药构型对实现理想燃烧与弹道性能的重要意义。