Experimental investigation of insulator material under conditions simulating solid propellant ramjet

Utilizing the existing ablation experimental system for the insulator material under oxygen-rich conditions, some ablation boundary parameters were extracted for afterburner insulator material of typical solid ramjet, and operation parameter's range in the experiment system was improved.Three formula of silicone rubber insulator ablation materials were selected and investigated, and the maximal charring ablation rate was obtained respectively.The results show that the charring ablation rate of three kinds of insulator materials is dominant by oxygen content and combustor pressure; the higher the oxygen content and combustor pressure is, the higher the carburization ablation rate; but the influence trend of three kinds of insulator materials are different, and charring ablation rate of 973S-1 is less than those of other insulators when the oxygen content is less than 10%; the charring ablation rate of 973S-1 is more than those of other insulators when the oxygen content is more than 10%.