Aerothermoelastic Modeling Considerations for Hypersonic Vehicles
Aerothermoelastic Modeling Considerations for Hypersonic Vehicles
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DOI：
10.2514/6.2009-7397
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发表时间：
2009-10
期刊：
影响因子：
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通讯作者：
J. McNamara;A. Culler;Andrew R. Crowell
中科院分区：
文献类型：
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作者：
J. McNamara;A. Culler;Andrew R. Crowell
气动热弹性在吸气式高超声速飞行器的分析和优化中起着重要的作用，影响着气动、结构、控制和推进系统在部件和多学科水平上的设计。本研究旨在通过对流体-热-结构耦合进行系统的研究来扩展对高超音速气动热弹性的基本理解，并使用创新的建模策略来开发框架，以减少与气动热弹性分析相关的计算工作量。由于这项工作的基本性质，分析仅限于简支，冯K臂板的圆柱弯曲。在分析中包括多个重要的影响，即：1）任意的，不均匀的，在平面内和通过厚度的温度分布，2）在高温下的材料性能退化，和3）弹性变形对气动加热的影响。结果发现，包括弹性变形的气动加热计算结果在减少飞行时间的颤振发作。此外，气动热弹性分析的基础上，无论是准静态或时间平均的动态流体-热-结构耦合，以及基于计算流体动力学的降阶模型的气动热通量的计算成本和精度之间的权衡进行评估。确定这些方法在气动热弹性建模的效率和/或准确性方面提供了显着改进的潜力。
The field of aerothermoelasticity plays an important role in the analysis and optimization of air-breathing hypersonic vehicles, impacting the design of the aerodynamic, structural, control, and propulsion systems at both the component and multi-disciplinary levels. This study aims to expand the fundamental understanding of hypersonic aerothermoelasticity by performing systematic investigations into fluid-thermal-structural coupling, and also to develop frameworks, using innovative modeling strategies, for reducing the computational effort associated with aerothermoelastic analysis. Due to the fundamental nature of this work, the analysis is limited to cylindrical bending of a simply-supported, von K arm an panel. Multiple important effects are included in the analysis, namely: 1) arbitrary, nonuniform, in-plane and through-thickness temperature distributions, 2) material property degradation at elevated temperature, and 3) the effect of elastic deformation on aerodynamic heating. It is found that including elastic deformations in the aerodynamic heating computations results in reduced flight time to the onset of flutter. Additionally, the trade-off between computational cost and accuracy is evaluated for aerothermoelastic analysis based on either quasi-static or time-averaged dynamic fluid-thermal-structural coupling, as well as computational fluid dynamics based reduced-order modeling of the aerodynamic heat flux. It is determined that these approaches offer the potential for significant improvements in aerothermoelastic modeling in terms of efficiency and/or accuracy.