Coupled numerical simulation for solid rocket motor ignition gas flow and propellant deformation

By using MpCCI coupler as the data exchange platform of FLUENT and ANSYS analysis software, the Fluid Structure Interaction (FSI) phenomenon during ignition process of large L/D ratio SRM with radial fin slot is simulated. The results show that ignition gas flow couples with grain deformation strongly at ignition transient of this type SRM, grain deformation occurs mainly at the cusp of radial fin slot step, which is aggravated along with ignition process. Grain deformation at the tip of middle fin slot is larger than the one of head fin slot, which results in ignition failure. The distribution of grain displacement and stress field is calculated under the impact of ignition pressure, and the research results can make certain groundwork for applying FSI technology to SRM.