固体推进剂定淬息距离凝相燃烧产物收集方法

Collection Method of Condensed Combustion Products of Solid Propellant Based on Constant Quenching Distance

关键词:  固体推进剂  凝相燃烧产物  团聚  收集方法  粒度分布

Key words:  Solid propellant  Condensed combustion products  Agglomeration  Collection method  Particle size distribution

摘要:

含铝固体推进剂凝相燃烧产物对发动机的能量特性、热防护以及燃烧稳定性均有重要影响。为了排除燃烧过程中推进剂燃面退移造成的凝相燃烧产物淬息距离逐渐增大的影响，设计并建立了一套基于恒定淬息距离的凝相燃烧产物收集系统，并通过典型丁羟四组元推进剂凝相燃烧产物的收集和分析，对该收集方法进行了校验。结果表明，淬息距离恒定使得凝相燃烧产物中的大粒径颗粒含量明显增大，小粒径的颗粒含量减小，产物中的单质铝含量增加。粒度分布与燃烧效率的差异验证了该收集方法的必要性及合理性。基于新的收集方法，研究发现燃烧室压力的增大使得推进剂燃面团聚程度减弱，团聚物平均粒径减小，收集到的凝相燃烧产物的平均粒径随压力增大而减小。

Abstract:

The condensed combustion products （CCPs） of aluminized propellants are critical to the energy performance， thermal ablation and combustion stability of solid rocket motor. In order to eliminate the effect of the gradual increasing quenching distance by retreat of propellant burning surface， a new collection system of CCPs based on constant quenching distance was designed and established. The collection method is verified through the collection and analysis of the condensed phase combustion products of typical AP/RDX/Al/HTPB propellant. Results show that constant quenching distance does affect the CCPs significantly， increasing the agglomeration content， reducing the amount of small oxide particles， and increasing the content of activated aluminum in the CCPs. The difference between particle size distribution and combustion efficiency verifies the necessity and rationality of the collection method. Based on the new collection method， it is found that increasing pressure in chamber can reduce degree of agglomeration and average particle size of the agglomerate. Average particle size of the CCPs decreased with the increase of pressure.