Analysis of Supercritical Startup of Cryogenic Heat Pipes With Parasitic Heat Loads
Analysis of Supercritical Startup of Cryogenic Heat Pipes With Parasitic Heat Loads
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DOI：
10.2514/1.10849
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发表时间：
2005-10
影响因子：
2.1
通讯作者：
P. Couto;J. Ochterbeck;M. Mantelli
中科院分区：
文献类型：
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作者：
P. Couto;J. Ochterbeck;M. Mantelli
提出了一种预测低温热管启动过程中瞬态温度分布的数学模型。改进的模型考虑了冷凝器区域已知的时变温度边界条件，而热管剩余长度的边界条件是辐射寄生热通量。对蒸气压进行建模以确定热管内饱和液体的质量分布。考虑使用轴向开槽的铝/氧低温热管。将启动期间热管轴向温度分布的理论结果与实验 μ-g 飞行数据进行比较，以验证新模型。验证之后，研究了一些运行参数对启动期间轴向温度分布的影响，以确定低温热管在什么条件下可以正常启动。
A mathematical model to predict the transient temperature profile of a cryogenic heat pipe during startup is presented. The improved model accounts for a known time-variable temperature boundary condition at the condenser region, while the boundary condition in the remaining length of the heat pipe is a radiative parasitic heat flux. The vapor pressure is modeled to determine the mass distribution of the saturated liquid inside the heat pipe. An axially grooved aluminum/oxygen cryogenic heat pipe is considered. Theoretical results for the axial temperature profile of the heat pipe for the startup period are compared to experimental μ-g flight data to validate the new model. Following the validation, the effects of some operational parameters over the axial temperature profile for the startup period are investigated to determine under what conditions the cryogenic heat pipe will start properly.