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针对液体火箭发动机真空比冲基本不变,火箭基循环组合发动机(RBCC)比冲随着飞行条件不断变化的特点,提出了将增广拉格朗日遗传算法优化第一级飞行弹道与传统液体火箭质量估算方法估算第二级起飞质量相结合,获得水平起飞两级入轨RBCC—RKT飞行器第一级起飞质量的估算方法,为总体方案初步设计论证提供参考。通过算例,分析了一级RBCC飞行器惰性质量比、最高动压,气动特性与起飞质量之间的关系。计算表明,降低RBCC飞行器惰性质量比、提高一级飞行器最大飞行动压、提高飞行器升阻比,都能有效地降低一级起飞质量。
In view of the fact that the specific rocket air-cycle combined impulse (RBCC) specific impulse of the rocket engine is almost unchanged, the augmented Lagrangian genetic algorithm is proposed to optimize the first-order flight trajectory and the traditional liquid The rocket quality estimation method is used to estimate the second-stage takeoff quality, and the first-stage RBCC-RKT aircraft takeoff quality estimation method is obtained, which provides a reference for the preliminary design and demonstration of the overall scheme. Through an example, the relationship between inertial mass ratio, maximum dynamic pressure, aerodynamic characteristics and take-off mass of RBCC aircraft is analyzed. The calculation shows that reducing the inert mass ratio of the RBCC aircraft, increasing the maximum flight pressure of the first stage aircraft and increasing the lift / drag ratio of the aircraft can effectively reduce the first stage takeoff mass.