Technical Approaches of Enhancing the Energy of Boron Based Fuel-rich Propellant

The energy levels of two sorts of boron based fuel-rich propellant,HTPB/AP/B and BAMO-THF/AP/B compositions,have been calculated with special thermodynamics code.It is showed that the specific impulse of the two propellants will both increase with increasing the boron contents in propellant formulations while the AP contents are decreasing and the contents of other ingredients are fixed simultaneously,and the specific impulse of HTPB propellant is higher than that of BAMO-THF propellant while the other ingredients except the binder in both propellants are consistent.According to the calculated results,the baseline formulation of boron based fuel-rich propellant has been established to carry out motor tests.It is indicated that the spurt injection efficiency of boron based fuel-rich propellant in spout of gas generator can reach 98% while adding 5%-8% magnesium powder to the baseline formulation.Fine boron powder and compound F have the function of enhancing the combustion efficiency of boron based fuel-rich propellant and accordingly improving the specific impulse in motor test.The specific impulse of fuel-rich propellant containing compound F3 and boron powders(particle size 2μm) has reached 9502N·s·kg~(-1) in ducted motor flight simulation test.