低压下镁铝富燃料固体推进剂燃烧性能研究

通过调节氧化剂含量、粒度级配，或加入KP、用硼粉替换部分铗铝及改变催化剂含量，研究了镁铝富燃料固体推进剂燃速和压强指数的变化规律。研究结果表明，燃速随着AP、KP粒度的减小而增加；随AP含量的增加而增加；随催化剂含量的增加而增加；随KP含量的降低而增加。压强指数随AP粒度减小呈先升高后降低再升高的趋势；粒度不同的配方随AP含量增加，压强指数变化趋势不同；催化剂含量对压强指数的影响规律也同AP粒度有关；KP的粒度变化对压强指数几乎无影响。硼粉替换部分镁铝对燃速和压强指数的影响规律与氧化剂的粒度有关。

Study on combustion properties of magnesium-aluminized fuel-rich solid propellants under low pressure

The change laws of burning rate and pressure exponent for magnesium-aluminized fuel-rich solid propellant were investigated by adjustment of the content of oxidizer or catalyst and the particle size distribution, or adding KP, or partial substitution of boron powders for magnesium-aluminum powders. The results show that the burning rate goes up along with the decrease of AP and KP particle size, or the increase of AP content and catalyst content, or the decrease of KP content. With the decrease of AP particle size, pressure exponent firstly goes up, then goes down, finally goes up again. But pressure exponent changes differently along with the increase of AP content for different particle size of AP. The effect of catalyst content on pressure exponent is closely related to particle size of AP. The particle size distribution of KP has negligible effect on pressure exponent. The effect of substitution of boron powders for magnesium-aluminized powders on burning rate and pressure exponent is also closely related to particle size of oxidizer.