通常用计算燃烧室内部小振幅振荡的增长或衰减速率来确定固体推进剂火箭燃烧室的线性稳定性。用纯增一衰系数αgd 表示燃烧室压力扰动状态的通用表达式为:P_1(z,t)-P(z)e~(αgdt) e~(iωt) (1)此表达式中,以系数αgd 的符号确定扰动的增衰。可证明,αgd 能以下列关系表示: The linear stability of a solid propellant rocket combustion chamber is usually determined by calculating the rate of increase or decrease of small amplitude oscillations inside the combustion chamber. The general expression of the pressure disturbance in the combustion chamber with the purely added-decay coefficient αgd is: P 1 z z z z e α α α α α α α θ (8) In this expression, The sign of αgd determines the increase or decrease of the disturbance. It can be shown that αgd can be expressed in the following relationship: