Heat-transfer characteristics of CO2 boiling flow in the regenerative cooling channel of an Mg/CO2 powder rocket engine for Mars missions
Heat-transfer characteristics of CO2 boiling flow in the regenerative cooling channel of an Mg/CO2 powder rocket engine for Mars missions
复制标题
火星任务Mg/CO2粉末火箭发动机再生冷却通道中CO2沸腾流传热特性
DOI：
10.1016/j.actaastro.2021.08.010
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发表时间：
2021-12
影响因子：
3.5
通讯作者：
Li Chao
中科院分区：
文献类型：
--
作者：
Wei Ronggang;Hu Chunbo;Wu Fuzhen;Hu Jiaming;Zhu Xiaofei;Yang Jiangang;Li Fengchao;Li Chao
为解决镁/二氧化碳粉末火箭发动机工作时间长带来的热防护问题，设计了一套实验系统来研究液态二氧化碳在蓄热式冷却通道中的换热特性。研究了热流密度、冷却液温度、质量流量和背压对近饱和CO2的换热系数、热力学性质和气相生成点的影响。换热系数随质量流量的增大或入口温度的降低而增大。较高的热流密度增加了气泡的形成速度，促进了核沸腾换热，但同时也加剧了膜沸腾，从而降低了换热性能。较低的背压对核沸腾区的换热性能没有影响，但对膜沸腾区的换热性能有一定的影响。经典的沸腾换热模型并不能很好地预测实验换热系数。结合实验数据，考虑了减压对换热的影响，提出了CO2饱和附近换热系数的经验关联式。优化后的模型对90.23%的实验数据进行了预测，预测精度大大提高。本研究为镁/二氧化碳粉末火箭发动机再生冷却方案的设计提供了理论依据。
To solve the problem of thermal protection posed by the long working time of Mg/CO 2 powder rocket engines, an experimental system is designed to study the heat-transfer characteristics of liquid CO 2 in the regenerative cooling channel. How the heat flux, coolant temperature, mass flux, and back pressure influence the heat-transfer coefficient, the thermodynamic quality, and the gas-phase formation point of nearly saturated CO 2 is studied. The heat-transfer coefficient is found to increase with increasing mass flux or decreasing inlet temperature. Higher heat flux increases the rate of bubble formation and promotes nucleate-boiling heat transfer, but it also intensifies the film boiling, thereby degrading the heat-transfer performance. Lower back pressure does not affect the heat-transfer performance in the nucleate-boiling region, but it worsens it in the film-boiling region. It is also found that the classical boiling-heat-transfer models do not predict the experimental heat-transfer coefficient well. Combined with experimental data, how reduced pressure affects heat transfer is considered, and a new empirical correlation formula is proposed for the heat-transfer coefficient of CO 2 near saturation. The optimized model can successfully predict 90.23% of the experimental data, and the prediction accuracy is improved greatly. The present research provides a theoretical basis for designing a regenerative cooling scheme for an Mg/CO 2 powder rocket engine.
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DOI：
10.1177/0954410012463642
发表时间：
2013-11
期刊：
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
影响因子：
--
作者：
W. Ning;Pan Yu;Zhou Jin
通讯作者：
W. Ning;Pan Yu;Zhou Jin
DOI：
10.1021/i260019a023
发表时间：
1966-07
期刊：
Industrial & Engineering Chemistry Process Design and Development
影响因子：
--
作者：
J. C. Chen
通讯作者：
J. C. Chen
影响因子：
3
作者：
A. Pathak;C. Sharma
通讯作者：
A. Pathak;C. Sharma
DOI：
10.1016/j.ijheatmasstransfer.2012.11.045
发表时间：
2013-03
影响因子：
5.2
作者：
Sung-Min Kim;I. Mudawar
通讯作者：
Sung-Min Kim;I. Mudawar
影响因子：
3.2
作者：
MOFFAT, RJ
通讯作者：
MOFFAT, RJ