Abstract: To investigate the cause of incomplete combustion in solid rocket motor,a slow-burning face was set up to change the regular pattern of the burning face.The incomplete combustion through observing the thrust line of ground state of test was found.It verified that there is a free space limit in motor combustion chamber.This limit is a value that affects the stable and unstable combustion.

Key words: Solid propellant rocket engine;Incomplete combustion;Stable combustion

摘要： 用设置缓燃层改变装药燃面的变化规律观察发动机地面静止试验推力曲线变化的方法 ,研究了固体火箭发动机不完全燃烧产生的机理。结果发现 ,发动机燃烧室存在一个自由容积的阈值 ,这个值是影响发动机稳态燃烧和非稳态燃烧的界限值。

关键词: 固体推进剂火箭发动机;不完全燃烧;稳定燃烧