In order to study the influence of swirl flow and carbon black added propellant on the combustion performance of solid fuel ramjet

pure polyethylene and carbon black added polyethylene were used as solid fuel

and experiments with combustion were conducted in both swirl-flow and non-swirl-flow of different port diameters of fuel grain. And the working performance parameters were calculated based on the parameters obtained from experiment. The results indicated that compared with pure polyethylene (PE)

the addition of 5% carbon black could increase the regression rate

characteristic velocity and thrust. In the working conditions of swirl-flow

the temperature and pressure of afterburning chamber were higher than those of non-swirl-flow

besides

the stability of combustion was also enhanced. Meanwhile

the increase of port diameter of fuel grain enhanced the combustion stability and efficiency of SFRJ

but decreased the regression rate.