In order to research the work process of the soft pulse separation device (PSD) in pulse solid rocket motor (SRM), a structural simulation model is established, the pressure bearing and opening up of PSD are simulated, and the field distribution of stress-strain is obtained. When the PSD bearing a 10 MPa pressure from pulse chamber I, the max main stress-strain of PSD and grain are within the material limit, which proves the reliability of the structure under pressure; To simulate the damaging process of PSD with XFEM method, the PSD is opened up under a 1.3 MPa pressure from pulse chamber II, and the failure form is reliable. The simulation results agree with the test well, and all kinds of indicators meet the design requirements, so the PSD is suitable for the pulse SRM. Then an internal flow field simulation model is established to investigate the characteristics of internal flow field in double-pulse motors at different time: increasing with the opening size, gas jet velocity and backflow strength decreasing, the center position of backflow moving toward the PSD, the turbulence strength in pulse chamber I decreasing dramatically, the collision position of the particle trajectory moving backward. The techniques and conclusions of this simulation method are useful for the design of pulse motor configuration.% 为了研究双脉冲发动机中软质隔层的工作过程,建立了隔层的结构仿真模型,数值模拟了隔层的承压及打开过程,得到其应力应变场分布.当隔层承受来自 I 脉冲10 MPa 内压作用时,隔层及药柱的最大主应力及应变都在安全范围内,从而证明了该结构承压可靠性；利用扩展有限元 XFEM 技术模拟了隔层的破坏过程,隔层在 II 脉冲1.3 MPa 内压下打开,且打开形式可靠.对比试验结果一致性较好,说明隔层各项指标满足设计要求,可以应用于实际的脉冲发动机之中.之后,建立了隔层式双脉冲发动机的内流场仿真模型,分不同时刻模拟了双脉冲发动机的内流场特点：随隔层开口尺寸增加,开口处气相射流速度减小,回流强度减弱且中心位置向隔舱移动,I 脉冲燃烧室内湍流强度急剧减小,粒子轨迹与内壁撞击位置后移.文中的仿真分析方法可以用来对双脉冲发动机进行预先仿真研究,从而对设计方案提供一定的参考意义.
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