Characteristics of Starship Propulsion System and Numerical Simulation of Propellant Flow During Reentry
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Beijing Institute of Astronautical Systems Engineering， Beijing 100076， China
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摘要:
为给新一代可重复使用运载器的研发提供参考，梳理了星舰动力系统的技术特点，并采用限体积法（Volume of fraction， VOF）对再入过程中液氧贮箱三维非定常流动进行了仿真，分析了复杂加速度场下推进剂贮箱内液氧流动特性。仿真结果表明，在星舰再入着陆阶段，贮箱内推进剂发生了低频率（<0.6 Hz）、高幅度（轴向质心偏移高达20%）的晃动；并且贮箱底部推进剂产生了大量夹气现象，这可能会给发动机带来灾难性后果。
Abstract:
To provide reference for the development of new generation reusable launch vehicles， the detailed characteristics of SpaceX Starship are summarized. The typical volume of fraction （VOF） method is employed to perform a numerical simulation of 3-D unsteady flow in liquid oxygen tank during the Starship’s reentry stage. The liquid oxygen （LOx） sloshing characteristics under complex accelerations are analyzed. The simulation results show that a low-frequent （<0.6 Hz） and a high-amplitude （i.e. axial center of mass displacement up to 20%） sloshing occurs during the Starship’s landing stage. A large amount of air entrainment appears at the bottom of the propellant tank， which may bring disasters to the rocket engine.