液体火箭注气式蓄压器流动阻尼理论模型

史童; 何允钦; 梁国柱; 潘辉; 朱平平

doi:10.13700/j.bh.1001-5965.2023.0748

液体火箭注气式蓄压器流动阻尼理论模型

doi: 10.13700/j.bh.1001-5965.2023.0748

1.
北京航空航天大学宇航学院，北京 102206
2.
北京宇航系统工程研究所，北京 100076

详细信息

通讯作者:
E-mail：lgz@buaa.edu.cn

中图分类号: V434⁺.3
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出版历程
- 收稿日期: 2023-11-20
- 录用日期: 2024-01-26
- 网络出版日期: 2024-04-08
- 整期出版日期: 2026-01-31

Theoretic model of flow resistance for gas-filled accumulators in liquid rockets

1.
School of Astronautics，Beihang University，Beijing 102206，China
2.
Beijing Institute of Astronautical Systems Engineering，Beijing 100076，China

More Information

Corresponding author: E-mail：lgz@buaa.edu.cn

摘要

摘要:
运载火箭纵向振动稳定性分析过程中需要进行增压输送系统的管道动力学分析。蓄压器流动阻尼计算方法直接影响输送系统动力学分析的准确性。目前，常用方法忽略了推进剂供应主管内流体流动的影响，采用孔板流动模型分析蓄压器流动阻尼，但存在较大偏差。基于此，引入连通孔流动模型，推导考虑推进剂供应主管内流体垂直流动影响的蓄压器非线性阻尼理论计算式；针对某蓄压器通过稳态数值仿真进行验证。结果表明：所提方法能够显著提高预测精度，对不同工况预测偏差在10%以内，而基于孔板流动模型的预测结果偏差超过30%。在此基础上进一步推导准稳态条件下的蓄压器线性阻尼理论计算式，并绘制线性阻尼曲线，发现蓄压器线性阻尼有最小值，其大小与连通孔总通流面积和主管内推进剂流速相关。
- 液体火箭 /
- 增压输送系统 /
- 注气式蓄压器 /
- 流动阻尼 /
- 连通孔
Abstract:
Hydraulic dynamics analysis of the pressurized supply system is needed in the process of longitudinal structure stability analysis of the launch vehicle. The method of calculating the accumulator’s resistance directly affects the accuracy of the dynamic analysis of the supply system. At present, the commonly used method is to ignore the influence of the fluid flow inside the propellant supply system and to analyze the accumulator resistance with an orifice flow model. However, this method has large errors. In this paper, by introducing the communication port flow model, the non-linear resistance calculation formula of the accumulator is deduced, where the influence of the vertical flow in the propellant supply system is considered. Then, this theoretical calculation method is verified by conducting a steady-state simulation on an accumulator. Under the various situations, it is discovered that the nonlinear resistance calculation approach suggested in this study may greatly increase prediction accuracy within a variation of less than 10%, whereas predictions based on the orifice flow model have deviations above 30%. The linear resistance theoretical formula under quasi-steady condition is further deduced and the linear resistance curve is drawn. The linear resistance of the accumulator was found to have a minimum value, which is related to the total flow area of the communication port and the velocity of propellant inside the main pipe.
- liquid rocket /
- pressurized supply system /
- gas-filled accumulator /
- flow resistance /
- communication port

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图 1 注气式蓄压器模型

Figure 1. Model of gas-filled accumulator

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图 2 几何模型示意图

Figure 2. Geometry model diagram

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图 3 网格展示

Figure 3. Mesh display

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图 4 单个连通孔和蓄压器流量系数对比

Figure 4. Flow coefficient comparison of single communication-port and accumulator

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图 5 不同工况下的结果对比

Figure 5. Comparison of results under different conditions

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图 6 蓄压器线性阻尼曲线

Figure 6. Linear resistance curve of accumulator

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