火药热分解特性与燃烧稳定性间相关性的分析

火药热分解过程的复杂性与其燃烧稳定性之间,存在有某种统计性的增函数关系。火药热分解特性对其燃烧特性的影响,是通过燃烧过程中亚表面热分解表观活化能的变化来实现的,当环境温度和压力较低时,亚表面的热分解特性,与常规条件下该火药的热分析结果相近。对于热分解过程较为复杂的火药,随着环境压力和温度的升高,其亚表面的分期机理和表观分解活化能将发生改变,亚表面分解速率随压力的变化规律也要发生变化,这就导致了燃烧过程的不稳定性,而对于那些热分解过程较为简单的火药,则不会出现这种情况,此外,本文还提出,火药中某些组分的爆燃是导致一些火药燃速压力指数较高的原因。

Analysis on the Relationship Between Thermal Decomposition Properties and Combustion Stability of Propellants

There exists a relationship of increasing function between the combustion stability and the thermal decomposition complexity of propellants. The relationship is more likely to be statistical than to be analytical. Through the changing of apparent decomposition activation energy ( E a ) of sub face during the combustion of propellant, the influence of thermal decomposition properties on combustion stability is exerted. When the circumstance pressure and the temperature are low, the thermal decomposition properties of sub face are similar to those determined under common thermal analysis conditions. To the propellants with relatively complex decomposition process, as the circumstance pressure and the temperature increase, the decomposition mechanism and apparent activation energy of the sub face will change. The rule by which the decomposition rate varies with pressure will be different. And unstability occurs in the combustion process. However, to propellants with relatively simple thermal decomposition process this will not happen. In addition, this paper also suggests that the reason for high burning rate pressure exponent is deflagration of some components in propellant.