固体火箭发动机药柱主动段飞行时应力应变分析

为了探讨固体火箭发动机药柱主动段飞行时的形变、应力和应变变化规律,以星形药型发动机为例,采用三维粘弹性有限元法,根据推进剂药柱的燃烧规律,通过计算发动机药柱在整个工作过程中不同烧蚀情况下各构成部分的结构响应,得到了主动段飞行时发动机药柱在不同环境温度、燃气内压与轴向过载联合作用下位移、应力和应变场随时间的变化规律。结果表明,低温点火发射时,内压增压至峰值时为发动机最危险时刻。

Analysis on stress and strain of solid rocket motor grain during active flight period

In order to investigate change law of displacement,stress and strain of solid rocket motor(SRM) grain during active flight time,taking a SRM grain with star-shaped configuration as an example,the structure response of all the components under various ablation conditions was calculated by means of three-dimensional viscoelastic finite element method and based on combustion law of propellant grain.The change law of displacement,stress,strain with working time of motor grain was obtained under the interaction of different temperature,working internal pressure and axial acceleration overloading.The results show that it is the most dangerous moment of the motor during low-temperature ignition process when the working internal pressure is up to the peak value.