运载火箭推进剂交叉输送技术收效分析

本文结合弹道优化,提出了估算和优化二级半构型运载火箭在不同发射模式和发射弹道下的近地轨道(low Earth orbit, LEO)最大运载能力的简单方法,并以长征七号为例进行了数值计算, 分析了使用推进剂交叉输送技术发射时的具体收效和最优弹道特点。数值计算表明：长征七号使用交叉输送技术发射时LEO最大运载能力能够比传统发射模式提高3 t(约20%), 同时降低发射过程中的最大轴向加速度近50%。该类型运载火箭采用推进剂交叉输送技术可以大幅提高运载能力。

EFFECTIVENESS OF THE PROPELLENT CROSS-FEED TECHNOLOGY FOR LAUNCH VEHICLE

This paper presents a simple method to estimate and optimize the maximum launch capability of low Earth orbit (LEO) with different launch modes and trajectories, combined with trajectory optimization. The numerical calculation is carried out for the CZ-7 rocket, to analyze the specific effect and the characteristics of the optimal launch trajectory when launching with the cross-feed technology. The results show that the maximum launch capability of the LEO can be increased by 3 t (about 20%) and the maximum axial acceleration during the launch can be reduced by nearly 50% if for the CZ-7, the propellant cross-feed technology is applied in the launching process. With the help of the propellant cross-feed technology, the launch capability of such lift launch vehicle can be greatly improved.