宇航学报

宇航学报 ›› 2021, Vol. 42 ›› Issue (1): 31-40.doi: 10.3873/j.issn.1000-1328.2021.01.004

• 飞行器设计与力学 • 上一篇    下一篇

动力冗余液体捆绑火箭的POGO稳定性分析

王涛，容易，胡久辉，唐冶，丁千   

  1. 1. 天津大学机械工程学院，天津 300072；2. 北京宇航系统工程研究所，北京 100076
  • 收稿日期:2020-02-10 修回日期:2020-07-01 出版日期:2021-01-15 发布日期:2021-01-25
  • 基金资助:
    国家自然科学基金（11972245,11902001）;中国博士后科学基金（2018M641643）

POGO Stability Analysis of Liquid Strap on Launch Vehicle with Redundant Propulsion System

WANG Tao, RONG Yi, HU Jiu hui, TANG Ye, DING Qian   

  1. 1. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China; 2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
  • Received:2020-02-10 Revised:2020-07-01 Online:2021-01-15 Published:2021-01-25

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摘要： 针对动力冗余和交叉输送技术向液体捆绑火箭的POGO振动稳定性分析提出的新任务，考虑独立工作(模式1)、一台助推发动机故障助推贮箱向芯级发动机供给推进剂(模式2)和两助推器同时向芯级发动机供给推进剂(模式3)三种工作模式，利用改进的Rubin方法分别建立液体捆绑火箭POGO稳定性的分析模型。数值计算分析表明，模式1和3下，POGO稳定性对助推蓄压器能量值的敏感程度强过芯级蓄压器。降低泵增益能提高液体捆绑火箭POGO稳定性，其中氧化剂泵的影响强于燃料泵，助推泵的影响强于芯级泵。助推燃料泵柔度的增加会降低燃路系统频率，可能诱发POGO振动，其中模式2下影响最大。本文工作为优化液体捆绑火箭动力冗余系统、抑制POGO振动提供了理论依据。

关键词: font-size:10.5pt, ">液体捆绑火箭；动力冗余；改进Rubin方法；POGO稳定性

Abstract: Aiming at the new task for POGO stability analysis of liquid strap on launch vehicle with redundant propulsion system and crossfeed, three different working modes of liquid bundled vehicle, i.e. independent work(Mode 1), tanks of the booster supply the propellants to the core stage engines in case of one booster failing(Mode 2), and two boosters feed propellants to the core stage engines at the same time(Mode 3), are taken into account, and the dynamic model is established by utilizing the improved Rubin’s method. The effects of the parameters of propulsion system on the POGO stability are analyzed by the numerical method. The results show that the POGO stability is more sensitive to the accumulator energy value of booster than that of core stage for modes 1 and 3. Reducing the pump gain can improve the POGO stability, in which the effect of oxygen pump is stronger than that of fuel pump, and the effect of pump of booster is larger than that of pump of core stage. The increase of the pump flexibility of booster reduces the frequency of fuel system, which may induce POGO vibration, in addition, the influence is the largest for mode 2. It provides the theoretical basis for further optimizing the redundant propulsion system of liquid strap on launch vehicle and restraining POGO vibration.

Key words: Liquid strap on vehicle, Redundant propulsion system, Improved Rubin’s method, POGO stability

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