In order to investigate the influence of different component propellants on the performance of solid fuel ramjet(SFRJ)

experiments were conducted on connected pipe facility for ignition of a SFRJ using polyethylene(PE) with paraffin

carbon black and carbon fiber as propellant. The combustion surface morphology was observed by SEM. The three-dimensional distribution of regression rate was obtained by using three-dimensional scanner and data reconstruction method. According to the data obtained from the experiment

the performance parameters of SFRJ under different working conditions were further calculated. Results indicated that: addition of 5% Carbon fiber could hinder the mechanical erosion of combustion surface of the polyethylene-based propellant and affect the pyrolysis process

making it impossible for self-sustaining combustion. The Kelvin-Helmholtz instability was found through the three-dimensional distribution of burning rate. Adding carbon black and paraffin to the polyethylene-based propellant could improve the regression rate

and the influence of paraffin was more obvious. The mass fraction of paraffin of 30%

50% paraffin and pure paraffin were 375%

514% and 544% higher than those of PE respectively. Finally

the relationship between the average regression rate of the polyethylene-based propellant and the mass fraction of paraffin was obtained.