Machine Learning Strategy for Wall Heat Flux Prediction in Aerodynamic Heating

IF 1.1 4区 工程技术 Q4 ENGINEERING, MECHANICAL Journal of Thermophysics and Heat Transfer Pub Date : 2023-01-01 DOI:10.2514/1.t6675
Gang Dai, Wenwen Zhao, Shaobo Yao, Weifang Chen
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Abstract

The efficient and accurate prediction of the aeroheating performance of hypersonic vehicles is a challenging task in the thermal protection system structure design process, which is greatly affected by grid distribution, numerical schemes, and iterative steps. From the inspiration of the theoretical analysis and machine learning strategy, a new wall heat flux prediction framework is proposed first by establishing the relationship between the wall heat flux and the flow variables at an extreme temperature point (ETP) in the normal direction of the corresponding wall grid cell, which is named the machine learning (ML)-ETP method. In the training phase, the flow properties and their gradients at the ETP and the distance from the ETP normal to the wall are employed as feature values, and the accurate wall heat flux predicted by the converged fine grid is regarded as the tag value. With the assistance of the trained regression model, the heat flux of the same configuration with a coarse grid in the wall-normal direction could be predicted accurately and efficiently. Moreover, test cases of different configurations and inflow conditions with a coarse grid are also carried out to assess the model’s generalization performance. All comparison results demonstrate that the ML-ETP strategy could predict wall heat flux more rapidly and accurately than the traditional numerical method due to its nonstrict grid distribution requirements. The improvement of the predictive capability of the coarse-graining model could make the ML-ETP method an effective tool in hypersonic engineering applications, especially for unsteady ablation simulations or aerothermal optimizations.
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气动加热壁热流预测的机器学习策略
在高超声速飞行器热防护系统结构设计过程中,受网格分布、数值格式和迭代步骤的影响较大,如何高效、准确地预测热防护性能是一项具有挑战性的任务。在理论分析和机器学习策略的启发下,首先通过建立壁面热流密度与相应壁面网格单元法线方向极端温度点(ETP)的流动变量之间的关系,提出了一种新的壁面热流密度预测框架,并将其命名为机器学习-ETP方法。在训练阶段,将ETP处的流动特性及其梯度和ETP法线到壁面的距离作为特征值,将收敛细网格预测的壁面精确热流密度作为标记值。利用训练好的回归模型,可以准确、高效地预测具有粗网格的相同结构的壁面法向热流密度。此外,还进行了不同配置和粗网格入流条件下的测试用例,以评估模型的泛化性能。对比结果表明,由于ML-ETP策略对网格分布的要求不严格,因此可以比传统数值方法更快、更准确地预测壁面热流密度。粗粒模型预测能力的提高可以使ML-ETP方法成为高超声速工程应用的有效工具,特别是用于非定常烧蚀模拟或气动热优化。
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来源期刊
Journal of Thermophysics and Heat Transfer
Journal of Thermophysics and Heat Transfer 工程技术-工程:机械
CiteScore
3.50
自引率
19.00%
发文量
95
审稿时长
3 months
期刊介绍: This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.
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