Studies on Fluid-Thermal-Structural Coupling for Aerothermoelasticity in Hypersonic Flow
Studies on Fluid-Thermal-Structural Coupling for Aerothermoelasticity in Hypersonic Flow
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DOI：
10.2514/1.j050193
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发表时间：
2010-08
期刊：
影响因子：
2.5
通讯作者：
A. Culler;J. McNamara
中科院分区：
文献类型：
--
作者：
A. Culler;J. McNamara
气动热弹性领域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-结构耦合的系统研究，扩展对高超声速气动热弹性的基本认识。重点是有针对性地使用简化的耦合程序，以减少与综合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，分析仅限于简支冯卡门板的圆柱弯曲。分析中包括多个重要效应：1）弹性变形和气动加热之间的相互耦合，2）瞬时任意面内和全厚度温度分布，以及3）相关的热应力和材料性能退化。研究发现，在气动加热计算中考虑弹性变形会导致热流不均匀，从而产生不均匀的温度分布和材料性能退化。这会导致局部区域的材料温度可能会超过限制;它也会影响颤振边界预测和非线性颤振响应。此外，计算成本和精度之间的权衡评估气动热弹性分析的基础上，无论是准静态或时间平均动态耦合。可以确定的是，这些方法提供了大量的计算费用的减少，与精度的损失可以忽略不计，气动热弹性分析在长时间的高超声速轨迹。
The field of aerothermoelasticity plays an important role in the analysis and optimization of airbreathing hypersonic vehicles, impacting the design of the aerodynamic, structural, control, and propulsion systems at both the component and multidisciplinary levels. This study aims to expand the fundamental understanding of hypersonic aerothermoelasticity by performing systematic investigations into fluid-thermal-structural coupling. A focus is on the targeted use of simplified coupling procedures in order to abate the computational effort associated with comprehensive aerothermoelastic analysis. Because of the fundamental nature of this work, the analysis is limited to cylindrical bending of a simply supported, von Karman panel. Multiple important effects are included in the analysis: namely, 1) mutual coupling between elastic deformation and aerodynamic heating, 2) transient arbitrary in-plane and through-thickness temperature distributions, and 3) the associated thermal stresses and material property degradations. It is found that including elastic deformations in the aerodynamic heating computations results in nonuniform heat flux, which produces nonuniform temperature distributions and material property degradations. This results in localized regions in which material temperature limits may be exceeded; it also impacts flutter boundary predictions and nonlinear flutter response. Additionally, the tradeoff between computational cost and accuracy is evaluated for aerothermoelastic analysis based on either quasi-static or time-averaged dynamic coupling. It is determined that these approaches offer substantial reductions in computational expense, with negligible loss of accuracy, for aerothermoelastic analysis over long-duration hypersonic trajectories.