铝冰固体推进剂燃速特性研究

Investigation of the combustion and characterization of aluminum ice solid propellant

通过建立铝冰固体推进剂燃烧模型,研究铝冰固体推进剂的燃速特性。将铝冰固体推进剂的燃烧过程分成铝水固相区、铝水液相区、铝水气相区和铝水反应区4个区域。结合各个区域的守恒方程和边界条件,利用牛顿迭代法求解出铝冰固体推进剂燃速的精确解。分析了铝颗粒钝化程度、铝粉粒径及水燃比3种因素变化对铝冰固体推进剂燃速的影响。结果表明,随铝颗粒钝化程度、铝粉粒径和水燃比的增大,铝冰固体推进剂的燃速减小;随铝粉粒径的增大,燃速压强指数减小,铝颗粒钝化程度和水燃比的变化不会引起压强指数的改变。

A combustion model was built to investigate the combustion and characterization of aluminum ice solid propellant. The combustion process of ALICE was divided into four zones, including the aluminum ice zone, the aluminum water zone, the alumi- num water vapor zone and the aluminum water reaction zone.The burning rate of ALICE was derived by solving the conservation e- quations in each zone and enforcing the mass and energy continuities at the interracial boundaries.An exact solution of the burning rate was calculated by using the Newton-Raphson iteration method.The effect of three factors （ including the passivation of the nano- aluminum powder, the water-fuel ratio and aluminum particle size） on the burning rate of ALICE solid propellant were studied. Re- suits show that the burning rate decreases with increasing of these three factors ; the pressure exponent increases with decreasing the aluminum particle size, and there is little effect of the passivation of the nano-aJuminum powder and water-fuel ratio on the pressure exponent.