Transient thermal and pressurization performance of LO2 tank during helium pressurization combined with outside aerodynamic heating
Transient thermal and pressurization performance of LO2 tank during helium pressurization combined with outside aerodynamic heating
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DOI：
10.1016/j.ijheatmasstransfer.2013.03.021
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发表时间：
2013-07
影响因子：
5.2
通讯作者：
Lei Wang;Yanzhong Li;Zhixiang Zhao;Zhan Liu
中科院分区：
文献类型：
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作者：
Lei Wang;Yanzhong Li;Zhixiang Zhao;Zhan Liu
建立了同时考虑罐内换热和外部气动加热的计算流体动力学（CFD）模型，研究了低温储罐在排气过程中的瞬态热增压性能。除了流体和罐壁区域外，泡沫区域也被视为计算区域。参考焓法用于计算外部气动热效应。通过与实验数据的比较，对CFD模型的预测能力进行了评价，得到了较好的一致性。然后利用该模型对某增压排放事件进行了预测，得到并分析了增压和热行为。结果表明，外部空气动力加热不能穿透泡沫层，不利于增压泵的增压泵性能。相反，一定比例的能量可能从加热的罐壁传递到泡沫层，这对加压行为产生负面影响。在泡沫绝热储罐的CFD模拟中，如果不特别考虑储罐外表面的热性能，气动加热效应可能无法考虑。总的来说，本文提供了一种有效的加压性能预测方法，并给出了低温储罐排料过程中内外热性能的有效结果。结果表明，CFD模型在预测增压特性方面具有较好的准确性。
A computational fluid dynamic (CFD) model, which can simultaneously account for the heat exchanges inside the tank and outside aerodynamic heating, is constructed to investigate the transient thermal and pressurization performance of cryogenic tank during discharge. Besides the fluid and tank wall regions, the foam region is also considered as the computational domain. Reference enthalpy method is used to account for the outside aerodynamic heating effect. The predictive ability of the CFD model is evaluated on the basis of the comparisons between its results and experimental data and a good agreement is obtained. Then the model is used to predict a pressurized discharge event, and the thermal and pressurization behaviors are obtained and analyzed. The results show that outside aerodynamic heating cannot penetrate the foam layer to facilitate the pressurization performance. Conversely, a certain proportion of energy might be transferred from heated tank wall to foam layer, which exert a negative effect on the pressurization behaviors. The aerodynamic heating effect may not be accounted for in the CFD simulation of a foam-insulated tank, if the thermal performance at outer surface of the tank is not particularly concerned. Generally, this paper supplies an effective way to predict pressurization performance and expresses valid results of the thermal performance inside and outside the cryogenic tank during discharge. It is also stated that the CFD model has a better accuracy in predicting pressurization characteristics.