运载火箭交叉输送系统关键影响因素辨识与分析

Identification and Analysis of Key Factors of Propellant Cross-feed System in Launch Vehicle

为深入了解交叉输送系统特性,辨识关键影响因素及其影响规律,通过系统建模与仿真分析开展交叉输送系统关键影响因素研究。推导了交叉输送系统关键组件数学模型,基于AMESim软件构建了系统仿真模型。研究表明,贮箱气枕压差和输送管路流阻是两大关键影响因素。为保证推进剂按额定流量交叉输送,必须对各子级箱压进行精确调节。由于助推上游主管路和交叉输送管路流阻对系统性能影响较大,在设计交叉输送系统时应该尽量缩短助推上游主管路和交叉输送管路,并尽量减小不同助推的管路流阻偏差。

The key factors of a propellant cross-feed system are studied by simulation to get in-depth knowledge of the cross-feed system characteristics and grasp the influence law of these key factors.The mathematical model of the major components of the cross-feed system is built and a simulation model is developed in AMESim.The research shows that the different ullage pressure of the propellant tanks and the flow resistance of the pipeline are the two key factors.In order to maintain the rate of cross flow,the ullage pressure of every propellant tank must be precisely regulated.The flow resistance of the upstream pipeline of the booster and cross-feed pipeline has the greatest impact on system performance,therefore the upstream pipeline of the booster and cross-feed pipeline should be shortened and the difference between the upstream pipelines of the two boosters should be reduced when a cross-feed system is designed.