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Reduction of transonic buffet onset for a wing with activated elasticity

机译：减少具有激活弹性的机翼的跨音速自助餐发作

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Transonic buffet, a kind of aerodynamic instability at a certain combination of Mach number and angle of attack, limits the aircraft flight envelope and fatigue life. The traditional method on transonic buffet onset prediction has an obvious limitation for an elastic wing, which ignores the feedback of oscillatory structure to the fluid. In this paper, the reduction of transonic buffet onset is observed when the feedback is considered for a wing with an activated pitching degree of freedom; that is, buffet will be provoked at some special structural parameters in pre-buffet flow conditions. This phenomenon is not caused by the static deformation of the structure but the coupling effect between fluid and structure. Besides, the dynamical characteristic and instability mechanism are significantly different from the SDOF (single degree of freedom) flutter [18]. The SDOF flutter is caused by the instability of the structural mode, and the flutter frequency locks into the structural frequency, while the present instability is governed by the fluid mode and the coupling frequency follows the buffet frequency in post-buffet conditions. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：跨音速自助餐是马赫数和迎角一定组合下的一种空气动力学不稳定性，它限制了飞机的飞行范围和疲劳寿命。传统的跨音速自助餐发作预测方法对弹性机翼有明显的局限性，它忽略了振荡结构对流体的反馈。在本文中，当考虑具有激活的俯仰自由度的机翼的反馈时，可以观察到跨音速自助餐发作的减少。也就是说，在自助餐前的流动条件下，自助餐会在某些特殊的结构参数下被激发。这种现象不是由结构的静态变形引起的，而是流体与结构之间的耦合作用引起的。此外，动力学特性和不稳定性机制与SDOF（单个自由度）颤振显着不同[18]。 SDOF颤动是由结构模式的不稳定性引起的，并且颤动频率锁定在结构频率中，而当前的不稳定性是由流体模式控制的，耦合频率遵循后自助条件下的自助频率。 （C）2018 Elsevier Masson SAS。版权所有。

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