Progressive Combustion Performance Study Of Partically Cut Stick Propellants, Coated Granular Propellants And Their Mixed Charge

In order to realize the progressive combustion of granular propellant and partial incision stick propellant, the surface of propellant was coated with titanium dioxide flame retardant materials, and the combustion characteristic was researched by the closed bomb test. The granular propellant and partial incision stick propellant were prepared which have different TiO2 content and ratio of length to diameter in the paper. The influence of titanium dioxide content and ratio of length to diameter on combustion performance of coated granular propellant was analyzed, then the effect of coated amount on combustion performance of coated partial incision stick propellant was analyzed and the influence of coating amount, titanium dioxide content, ratio of length to diameter and mixed ratio on combustion performance of mix charging was researched.For the granular TEGDN ZTHG-7/19, the increasing combustion of coated propellant is the strongest whose the coating amount is 20% and titanium dioxide content is 30% under room temperature and high pressure, and For the granular TEGDN ZTHG-21/19, the increasing combustion of coated propellant is the strongest whose the coating amount is 20% and titanium dioxide content is 30% under room temperature and high pressure. The proper ratio of length to diameter and mixed ratio both can improve the combustion effect. The mixed charging of coated propellant and main charge can improve the combustion performance effectively. For the ZTHG-7/19, the increasing combustion of coated propellant is the strongest whose the coating amount is 20%, titanium dioxide content is 30% and ratio of length to diameter is 2 under room temperature and atmospheric pressure, and for the ZTHG-16/19, the increasing combustion of coated propellant is the strongest whose the coating amount is 20%, titanium dioxide content is 30% and ratio of length to diameter is 2 under room temperature and atmospheric pressure. For the mixed charging, the combustion performance of hybrid propellant charge is the strongest whose the coating amount is 20%, titanium dioxide content is 30%, the mix ratio of 3:7 and ratio of length to diameter L/D is 2 under the room temperature and atmospheric pressure. For the hybrid propellant charge of ZTHG-7/19 (partial incision stick propellant) and ZTHG-7/19 (L/D=2, coated propellant), the combustion performance of hybrid coated propellant is the strongest whose the coating amount is 20%, the TiO2 content is 30% and ratio of length to diameter is 2 under normal temperature and pressure. For the propellant of ZTHG-7/19, L/D=1/2 and ZTHG-16/19, L/D=1/2 whose the coating amount is 20% and the TiO2 content is 30% under normal temperature and pressure, the progressive combustion of coated propellant is obviously higher than that of uncoated propellant. For the coated partial incision stick propellant of ZTHG-16/19, the combustion performance of coated partial incision stick propellant is the strongest whose the coating amount is 35% under the normal temperature and pressure.The results showed that the proper mixed ratio can also effectively improve the combustion performance of hybrid charging of coated propellant and main charge.