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首页> 外文会议>AIAA/ASME/SAE/ASEE joint propulsion conference exhibit >Modeling Interfacial Turbulent Heat Transfer during Ventless Pressurization of a Large Scale Cryogenic Storage Tank in Microgravity
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Modeling Interfacial Turbulent Heat Transfer during Ventless Pressurization of a Large Scale Cryogenic Storage Tank in Microgravity

机译：在微重力下对大型低温储罐进行无压增压时的界面湍流传热模型

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摘要

A two-phase CFD model for pressurization of cryogenic storage tanks is presented using both the Sharp Interface and VOF approaches for representing the phase boundary and the associated interfacial heat, mass and momentum transfer between the liquid and the vapor regions. Both models were validated against the microgravity pressurization data provided by the Saturn S-IVB AS-203 experiment, with the VOF model producing better agreement. Since proper representation of turbulence effects is crucial for predicting interfacial heat and mass transfer with fidelity, two different engineering models for turbulence, namely, the k-ε and the Shear-Stress Transport (SST) k-ω are considered. The fidelity of the two turbulence models for storage tank problems is assessed. The impacts of different turbulent parameters associated with the models, such as initial distributions of the respective turbulent quantities and different interfacial boundary conditions, are also studied. The results of our study underscore the fact that accurate modeling of turbulent inierfacial heat transfer is crucial for predicting correct self-pressurization and thermal stratification in the cryogenic storage tank. In this context all the important aspects of turbulent modeling at the interface need to be properly addressed. This includes: 1) initial turbulence level; 2) interfacial turbulence B.C.; 3) the contribution of interface deformations to the enhancement of the interfacial turbulent heat transfer.
机译：利用夏普界面和VOF方法，提出了一种用于低温储罐增压的两相CFD模型，用于表示相边界以及相关的液体和蒸气区域之间的界面热，质量和动量传递。两种模型都根据Saturn S-IVB AS-203实验提供的微重力加压数据进行了验证，VOF模型产生了更好的一致性。由于湍流效应的正确表示对于保真地预测界面传热和传质至关重要，因此考虑了两种不同的湍流工程模型，即k-ε和Shear-Stress Transport（SST）k-ω。评估了储罐问题的两种湍流模型的保真度。还研究了与模型相关的不同湍流参数的影响，例如各个湍流量的初始分布和不同的界面边界条件。我们的研究结果强调了这样一个事实，即湍流非界面传热的精确模型对于预测低温储罐中正确的自加压和热分层至关重要。在这种情况下，需要适当解决界面处湍流建模的所有重要方面。这包括：1）初始湍流水平; 2）界面湍流B.C .; 3）界面变形对增强界面湍流传热的作用。

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