微型通道中液态甲烷沸腾传热特性的实验研究

Q4 Physics and Astronomy Defect and Diffusion Forum Pub Date : 2023-12-12 DOI:10.4028/p-eNC5GS
Jie Song, Qing Lian Li, Jun Sun, Xin Lin Liu, Lan Wei Chen
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引用次数: 0

摘要

LOX/LCH4火箭发动机具有成本低、无毒无污染、维护方便、适合重复使用、比冲高的优点,已被公认为未来空间飞行器的理想动力选择。在 LOX/LCH4 火箭发动机大范围变推力过程中,由于低工况下燃烧器压力较低,冷却剂甲烷处于亚临界状态。在再生冷却通道(RCC)中容易出现两相流的不稳定现象,迫切需要研究甲烷在 RCC 中的相变传热性能。实验研究了液态甲烷在直径为 1.0、1.5 和 2.0 毫米的单个微型通道中的流动沸腾特性。测试了质量通量(266.75~1781.26 kg/m2-s)、入口压力(0.56~4.24 MPa)、热通量(53.25~800.07 kW/m2)和通道直径(1.0~2.0 mm)对流动沸腾传热系数的影响。结果表明,存在两个传热机制不同的区域,一个是低质量时的成核沸腾主导区域,另一个是高质量时的对流蒸发主导区域。提出了一种由 Bo、We、Kp、X、Co、Ftg 表示的新相关性,该相关性对 355 个实验数据具有良好的拟合效果,平均绝对误差(MAE)为 10.9%。本实验结果可为 LOX/LCH4 火箭发动机的热保护预测和 RCC 的优化设计提供参考。
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Experimental Investigation on Boiling Heat Transfer Characteristics of Liquid Methane in Mini Channel
LOX/LCH4 rocket engine has been recognized as the ideal power choice for future space vehicles due to the merits of low cost, non-toxic and pollution-free, convenient maintenance, suitable for reuse and high specific impulse. In the process of wide range variable thrust of LOX/LCH4 rocket engine, the coolant methane is in a subcritical state due to the low combustor pressure under low operation conditions. The instability of two-phase flow is easy to occur in regenerative cooling channel (RCC), and it is urgent to investigate the heat transfer performance of methane with phase change in RCC. Experiments have been conducted to investigate the flow boiling characteristics of liquid methane in the single mini channels with the diameters of 1.0, 1.5 and 2.0 mm. Effects of the mass flux (266.75~1781.26 kg/m2·s), inlet pressure (0.56~4.24 MPa), heat flux (53.25~800.07 kW/m2) and channel diameter (1.0~2.0 mm) on the flow boiling heat transfer coefficients are tested. Results show that there are two regions with different heat transfer mechanism, one is the nucleate boiling dominated region for low mass quality and the other is the convection evaporation dominated region for high mass quality. A new correlation expressed by Bo, We, Kp, X, Co, Ftg is proposed, which yields good fitting for 355 experimental data with a mean absolute error (MAE) of 10.9%. Present experimental results can provide reference for the thermal protection prediction and optimal design of RCC in LOX/LCH4 rocket engine.
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来源期刊
Defect and Diffusion Forum
Defect and Diffusion Forum Physics and Astronomy-Radiation
CiteScore
1.20
自引率
0.00%
发文量
127
期刊介绍: Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.
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