关键词: 脉动式火箭发动机;微型装药火箭发动机;有限元法;结构强度

Abstract: A static and dynamic finite element analysis(FEA) on a solid impulsive microthruster with the flight attitude control was presented. The design characteristics and technological effect were considered during the numerical simulation of both the static deformation on test bed and real dynamic loading of the microthruster. Numerical results show that there exists a very similar comparison of the stress and deformation distribution between dynamic and static loading, where the static internal pressure in the combustion chamber is equal to the peak one of the dynamic load; and the major broken behaviors which parallel to the axis of the combustion chamber may appear at the roots of the technological grooves near the screw connetion between its chamber and igniter or and nozzle. The broken behaviors predicted by FEA agree with that observed in tests.

Key words: Impulse rocket engine;Micrograin rocket engine;Finite element method;Structural strength