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首页> 外文会议>AIAA propulsion and energy forum;AIAA/SAE/ASEE joint propulsion conference >CFD Extraction of Heat Transfer Coefficient in Cryogenic Propellant Tanks
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CFD Extraction of Heat Transfer Coefficient in Cryogenic Propellant Tanks

机译：低温推进剂罐传热系数的CFD提取

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The current reduced-order thermal model for cryogenic propellant tanks is based on correlations built for flat plates collected in the 19S0's. The use of these correlations suffers from inaccurate geometry representation; inaccurate gravity orientation; ambiguous length scale; and lack of detailed validation. This study uses first-principles based CFD methodology to compute heat transfer from the tank wall to the cryogenic fluids and extracts and correlates the equivalent heat transfer coefficient to support reduced-order thermal model. The CFD tool was first validated against available experimental data and commonly used correlations for natural convection along a vertically heated wall. Good agreements between the present prediction and experimental data have been found for flows in laminar as well turbulent regimes. The convective heat transfer between the tank wall and cryogenic propellant and that between the tank wall and ullage gas were then simulated. The results showed that the commonly used heat transfer correlations for either vertical or horizontal plate over-predict heat transfer rate for the cryogenic tank, in some cases by as much as one order of magnitude. A characteristic length scale has been defined that can correlate all heat transfer coefficients for different fill levels into a single curve. This curve can be used for the reduced-order heat transfer model analysis.
机译：当前用于低温推进剂罐的降阶热模型基于为19S0年代收集的平板建立的相关性。这些相关的使用遭受几何图形表示不准确的困扰。重力方向不正确;长度尺度不明确;并且缺乏详细的验证。这项研究使用基于第一原理的CFD方法来计算从罐壁到低温流体的热传递，并提取并关联等效热传递系数以支持降阶热模型。 CFD工具首先根据可用的实验数据和沿垂直加热壁的自然对流常用的相关性进行了验证。对于层流以及湍流​​区域的流量，目前的预测和实验数据之间已经找到了很好的一致性。然后，模拟了罐壁与低温推进剂之间的对流传热，以及罐壁与剩余气体之间的对流传热。结果表明，通常使用的垂直或水平板的传热相关性会过度预测低温罐的传热速率，在某些情况下会高出一个数量级。已经定义了一个特征长度标尺，该标尺可以将不同填充量的所有传热系数关联到一条曲线中。该曲线可用于降阶传热模型分析。

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