The powder gas, generated continuously due to burning of propellant forms air-cushion among propellant grains, which can buffer and protect propellant grains from bumping, impacting and extruding.
发射药燃烧时不断产生的燃气在药粒之间形成气垫，对药粒的撞击、挤压起到缓冲保护作用。
2
In comparison with propellant with pure boron powder, the apparent decomposition heat of propellant with boron composition increases 12.6%.
相对于纯硼粉的推进剂，硼复合粒子的推进剂的表观分解热最高提高了12.6%。
3
Nevertheless, particle size distribute does not change with the combustion chamber pressure and propellant aluminum powder percentage.