Thermodynamic characteristic in a cryogenic storage tank under an intermittent sloshing excitation
Thermodynamic characteristic in a cryogenic storage tank under an intermittent sloshing excitation
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间歇晃动激励下低温储罐的热力学特性
DOI：
10.1016/j.ijhydene.2020.02.134
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发表时间：
2020-04
影响因子：
7.2
通讯作者：
Li Yanzhong
中科院分区：
文献类型：
--
作者：
Liu Zhan;Cai Haoyang;Feng Yuyang;Liu Yuanliang;Li Yanzhong
建立了一个数值计算模型，研究了间歇晃动激励下低温燃料箱的耦合热动态特性。外部热输入和间歇激励均由用户自定义函数实现。采用流体体积法模拟流体晃动，并结合网格运动处理。通过相关的流体晃动实验验证，该数值模型对流体晃动的预测是可以接受的。蒸汽被过冷液体冷却，总是处于冷凝状态。中间汽压测试点受间歇激励的影响较小，呈线性降压曲线，而中间液压测试点则呈波动变化。对于蒸汽和界面温度监测器，在第二保温期内出现明显的温度波动。而对于液体测试点，温度曲线在晃动期间经历剧烈波动，在保持期间经历稳定的温度变化。由于外部激励的保持时间，间歇晃动工况下的罐压降低量小于连续晃动工况下的罐压降低量。也就是说，通过适当的间歇激励可以调节储罐的压力下降速率。本文的研究对深入理解非规则外部激励下储罐内流体的晃动现象具有重要意义。
A numerical calculation model is developed to study the coupled thermal dynamic performance in a cryogenic fuel tank under an intermittent sloshing excitation. Both external heat inputs and the intermittent excitation are realized by User-defined functions. The volume of fluid method is adopted to simulate fluid sloshing, coupled with the mesh motion treatment. Validated against related fluid sloshing experiments, the numerical model was turned out to be acceptable on fluid sloshing prediction. Cooled by subcooled liquid, vapor is always in condensation. The middle vapor pressure test point suffers less from the intermittent excitation and has a linear pressure decrease profile, while the middle liquid pressure test point has fluctuating variations. For vapor and interface temperature monitors, obvious temperature fluctuations appear in the second holding period. While for liquid test points, the temperature profiles experience intensive fluctuations during sloshing periods and stable temperature variation during holding periods. Due to the holding period of external excitation, the tank pressure reduction in intermittent sloshing case is less than that in continuous sloshing case. That is to say the tank pressure decrease rate could be adjusted by proper intermittent excitation. This work is significant to deeply understand fluid sloshing phenomenon under some irregular external excitations in fuel storage tanks.
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