AP@Al复合材料的制备及燃烧性能研究OA北大核心CSTPCD

During the combustion of traditional aluminum-based propellants,Al agglomeration and products of condensed phase combustion would cause serious two-phase flow loss,resulting in a decrease in specific impulse.In this work,NH4 ClO4@Al(AP@Al)composites were designed and prepared to increase the effective contact between oxidant and fuel,and the morphology,struc-ture,thermal decomposition performance,combustion performance,residue particle size and combustion mechanism of AP@Al were studied.The results show that Al powder is evenly dispersed on the surface of AP in AP@Al composites,which effectively in-creases their contact area and shortens the distance of mass and heat transfer.The decomposition of AP produces a large amount of gas,which helps to disperse Al powder.The full contact between Al powder and oxidizing atmosphere not only promote the combus-tion of Al powder,but also reduce the particle size of combustion residue.Compared with the physical mixture,the combustion flame maximum temperature of AP@Al-HTPB propellant is increased by 28%.And the combustion time is shortened by 5.1%.Ac-cordingly,the combustion rate is increased by 5.6%.In addition,the particle size of residue is reduced by 32.7%.To sum up,the combustion performance of AP@Al-HTPB propellant is obviously improved.