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首页> 外文期刊>Progress in Aerospace Sciences >Transonic aeroelasticity: A new perspective from the fluid mode
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Transonic aeroelasticity: A new perspective from the fluid mode

机译：跨音速气动弹性：流体模式的新视角

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Within the transonic regime, the aeroelastic problems exhibit many unique characteristics compared with subsonic and supersonic cases. Although a lot of research has been carried out in this field, the underlying mechanisms of these complex phenomena are not clearly understood yet, resulting in a challenge in the design and use of modern aircraft. This review summarizes the recent investigations on nonclassical transonic aeroelastic problems, including transonic buzz, reduction of transonic buffet onset, transonic buffeting response and frequency lock-in phenomenon in transonic buffet flow. After introducing the research methods in unsteady aerodynamics and aeroelastic problems, the dynamical characteristics as well as the physical mechanisms of these phenomena are discussed from the perspective of the fluid mode. In the framework of the ROM (reduced order model) -based model, the dominant fluid mode (or the eigenvalue) and its coupling process with the structural model can be clearly captured. The flow nonlinearity was believed to be the cause of the complexity of transonic aeroelasticity. In fact, this review indicates that the complexity lies in the decrease of the flow stability in the transonic regime. In this condition, the fluid mode becomes a principal part of the coupling process, which results in the instability of the fluid mode itself or the structural mode, and thus, it is the root cause of different transonic aeroelastic phenomena.
机译：在跨音速状态下，与亚音速和超音速情况相比，气动弹性问题表现出许多独特的特征。尽管在该领域已经进行了大量研究，但是这些复杂现象的潜在机理还不清楚，这给现代飞机的设计和使用带来了挑战。这篇综述总结了对非经典跨音速气动弹性问题的最新研究，包括跨音速嗡嗡声，跨音速抖振起伏，跨音抖振响应和跨音速振流中的频率锁定现象。在介绍了非定常空气动力学和气动弹性问题的研究方法之后，从流体模式的角度讨论了这些现象的动力学特征以及物理机制。在基于ROM（降阶模型）的模型的框架中，可以清楚地捕获主导流体模式（或特征值）及其与结构模型的耦合过程。流动非线性被认为是跨音速气动弹性复杂性的原因。实际上，该综述表明复杂性在于跨音速状态下流动稳定性的降低。在这种情况下，流体模式成为耦合过程的主要部分，这导致流体模式本身或结构模式不稳定，因此，这是不同跨音速气动弹性现象的根本原因。

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