飞机气动弹性低空大气turbulence模型的评定
Assessment of low-altitude atmospheric turbulence models for aircraft aeroelasticity
摘要：
本文研究了柔性飞行器在低空大气湍流中的动态响应。为此，本文采用了三种增逼真度的湍流模式，即一维vonK {á}rm{á}n模式、二维Kaimal模式和从大涡模拟（LES）中提取的全三维风场，对近地面环境湍流进行了模拟。采用完全耦合的非线性飞行动力学/气动弹性模型，对一种柔性大展弦比飞机在上述模型产生的背景大气湍流中进行载荷计算和飞行轨迹预测。在不同柔度的飞行器上对载荷包线和谱内容的比较表明，所选紊流模型和飞机气动弹性响应之间有很强的依赖性（例如，LES模型和von K{á}rm{á}n模型之间的翼根弯矩预测值相差58%）。这主要是由于在低海拔处存在大的流动结构，其具有与飞行器相当的尺寸，并且尽管地球边界层内的风速相对较小，但其导致总体高载荷事件。结果表明，一维模型，不捕捉这些影响提供相当不保守的负载估计，是不适合非常灵活的机身设计。
英文摘要：
We investigate the dynamic response of flexible aircraft in low-altitude atmospheric turbulence. To this end, three turbulence models of increasing fidelity, namely, the one-dimensional von K{á}rm{á}n model, the two-dimensional Kaimal model and full three-dimensional wind fields extracted from large-eddy simulations (LES) are used to simulate ambient turbulence near the ground. Load calculations and flight trajectory predictions are conducted for a flexible high-aspect ratio aircraft, using a fully coupled nonlinear flight dynamics/aeroelastic model, when it operates in background atmospheric turbulence generated by the aforementioned models. Comparison of load envelopes and spectral content, on vehicles of varying flexibility, shows strong dependency between the selected turbulence model and aircraft aeroelastic response (e.g. 58\% difference in the predicted magnitude of the wing root bending moment between LES and von K{á}rm{á}n models). This is mainly due to the presence of large flow structures at low altitudes that have comparable dimensions to the vehicle, and which despite the relatively small wind speeds within the Earth boundary layer, result in overall high load events. Results show that one-dimensional models that do not capture those effects provide fairly non-conservative load estimates and are unsuitable for very flexible airframe design.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
