Solid Rocket Engine Ignition Impact Process Of Fluid-solid Coupling Simulation

During the start-up of ignition process, the solid rocket motor is typically involved in fluid-structure coupling process. The propellant deforms under the gas pressure, thereby inFluents the gas flow in turn. There might be inherent defect inside the motor. The crack might extend and the debond might also happen. So it is meaningful to investigate the coupled effect between fluid and structure during the start-up of ignition process in solid rocket motor by coupling Fluent and Abaqus via MpCCI.This paper describes method and procedures of FSI analysis of composite propellant rocket motor. These researches make the strength problens as background, which is common during the start-up of ignition process. The results make sense to project application and experiment design. Below are the main contents of this paper:1) Build a3D SRM model, analysis the displacement and stress distribution of the structure and the pressure of the fluid via FSI. The effection of heat transfer was ignored, and the influence of the stress release was described. The maximum deformation point is located in the thewing slot of the star propellant, which is bigger than tube perpellant’s;2) CoMPare the stress and stain of the4stress release in different position, which can help the SRM optimization design. There is a relative enclosure space in thewing slot inside the motor, which causes big deformation on propellant grain and stress reliever. This space is the high-risk area for structural deboning in solid rocket motor.3) Analysis the2D model of a propellant with crack. Simulated the FSI process during the ignition.4) CoMPare the models with different crack and different inlet pressure, calculate the stress intensity factor of the crack tip and the pressure inside the crack.