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1. 西安交通大学制冷与低温工程系,西安,710049
2. 上海宇航系统工程研究所,上海,201109
Online First:10 September 2023,
Published:2023
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QU Miao, WANG Lei, SUN Peijie, et al. Visualization Test Study on Two-Phase Flow Behaviors Inside Cryogenic Tank Under High Heat Flux[J]. 2023, 57(9): 62-70.
QU Miao, WANG Lei, SUN Peijie, et al. Visualization Test Study on Two-Phase Flow Behaviors Inside Cryogenic Tank Under High Heat Flux[J]. 2023, 57(9): 62-70. DOI: 10.7652/xjtuxb202309007.
为研究大热流下低温推进剂贮箱箱内流体温度分层与沸腾气泡特征
以液氮为试验流体
搭建了低温贮箱变热流可视化相态观测平台
通过改变吹风温度与吹风速度
实现了1~16 kW·m
-2
热流边界调节
与火箭升空过程中承受气动热流冲击基本一致。试验结果表明:低温贮箱壁面受大热流作用
并不一定产生沸腾气泡; 当壁面热流密度小于2 kW·m
-2
直至液体主体过冷度降至1 K时
近壁区才有气泡产生; 壁面热流密度达到16 kW·m
-2
以上后
即使液体主体区过冷度超过10 K
近壁区也可能产生沸腾气泡; 当液体主体存在较大过冷度时
火箭升空过程的气动加热仅会造成近壁区出现气泡; 在对低温贮箱增压时
提高增压气体注入速率
加快增压进程有利于延缓近壁区液体温升与沸腾发生。此外
建立了一种预测沸腾气泡发生边界的经验模型
可对裸壁贮箱在大热流下是否发生推进剂沸腾提供初步预测
从而为火箭贮箱绝热方案设计提供支撑。
In order to investigate the thermal stratification and boiling bubble features in the cryogenic propellant tank under great heat flux conditions
a visual platform was built
using liquid nitrogen as the test fluid. By adjusting the blowing temperature and speed
a heat flux boundary range of 1—16 kW·m
-2
was achieved
which was basically consistent with the aerodynamic heat flow impact during rocket launching. The results show that a high heat flux at the tank wall surface does not necessarily bring about boiling bubbles; when the heat flux density is less than 2
kW·m
-2
bubbles are generated in the near-wall region until the subcooling degree of the bulk liquid decreases to 1 K; comparatively
when the heat flux density exceeds 16 kW·m
-2
a high subcooling degree of 10 K of the bulk liquid could yield boiling bubbles. When there is a large degree of subcooling in the bulk liquid
the aerodynamic heating during rocket launch only causes bubbles in the near-wall region. Increasing the pressurized gas injection rate during the pressurization period of the cryogenic tank could postpone the liquid temperature rise as well as boiling occurrence in the near-wall region. In addition
an empirical model was established to describe the boundary of boiling bubbles
which can offer preliminary predictions on whether propellant boiling occurs in bare-wall storage tanks under high heat flux
thus providing support for the design of the insulation scheme for the rocket tank.
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