Large Eddy Simulation of the interaction of wing wake and the horizontal tail plane under buffet conditions

抖振条件下机翼尾流与水平尾翼相互作用的大涡模拟

• 批准号: 428262696
• 负责人: Professorin Dr.-Ing. Andrea D. Beck
• 金额: --
• 依托单位: Institut für Aerodynamik und Gasdynamik (IAG)
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/428262696?language=en
• 关键词: Large; Eddy; Simulation; interaction; wing

High-speed stall occurs at the upper edge of the flight envelope. It is characterized by a cyclic movement of the compression shock (so-called buffet phenomenon) and an associated flow separation. The resulting unsteady wing wake can hit the downstream horizontal tail plane and induce unwanted flow conditions and structural loads. This results in a complex, nonlinear chain of effects over a wide range of turbulent scales. The physical interpretation and numerical prediction of these coupled interactions remain challenging. In addition, during the measurements performed in Phase 1 on the XRF-1 configuration at ETW and on the fundamental experiment in the Trisonic wind tunnel at AIA, structural vibrations were observed, some of them significant. Their influence has not been considered in analysis and numerics so far. It is known that, depending on the frequency relation, a modulation of the buffet can occur. This additional influence increases the complexity of the chain of action buffet - wake - horizontal tail plane. Therefore, the goal of this research project is to contribute to the understanding of the interaction of wing wake and flow at the horizontal tail plane, taking into account the influence of structural vibrations. To this end, we first investigate the effects of vibrations on the buffet at the wing. We plan a structured progressive measurement and simulation campaign on the fundamental experiment, where TP5 is responsible for the simulative side. This strategy will allow us to clarify the mutual influences of geometric factors (sweep angle, span) and vibrations. Numerically, the individual effects (with and without vibrations) can be decoupled and considered separately. The basic question here is whether and how structural vibrations modulate buffet (especially in the 3D case) and whether or under which conditions a lock-in occurs. For this purpose, we make use of the in phase 1 established method of wall-modeled large-eddy simulation, extended to introduce the structural motions and deformations through a moving-grid formulation. The efficiency of these high-order methods allows for a significant increase in spanwise domain length over previously reported simulations. As a further sub-objective, we use this methodology to clarify the extent to which these vibrations modulate wake-tailplane interactions compared to Phase 1. For this purpose, we perform coupled AZDES-LES simulations of the overall interaction chain from wing to horizontal stabilizer including vibrations with our subproject partners. We characterize the influence of the vibrations on the overall scale.The overall project goal is thus to contribute to a detailed understanding of the basic physics of the modulation of buffet by structural vibrations and to transfer these findings to the buffet - wake - tailplane chain of action.

高速失速发生在飞行包线的上边缘。其特征是压缩冲击的循环运动（所谓的抖振现象）和相关的流动分离。由此产生的不稳定机翼尾流可能会撞击下游水平尾翼并引发不必要的流动条件和结构载荷。 这会导致在广泛的湍流尺度上产生复杂的非线性效应链。这些耦合相互作用的物理解释和数值预测仍然具有挑战性。此外，在第一阶段对 ETW 的 XRF-1 配置和 AIA Trisonic 风洞中的基础实验进行的测量期间，观察到结构振动，其中一些振动很严重。到目前为止，它们的影响尚未在分析和数值中得到考虑。众所周知，根据频率关系，可以发生抖振调制。这种额外的影响增加了抖振-尾流-水平尾翼动作链的复杂性。因此，该研究项目的目标是有助于理解机翼尾流与水平尾翼流动的相互作用，同时考虑结构振动的影响。为此，我们首先研究振动对机翼抖振的影响。我们在基础实验上计划了一个结构化的渐进测量和模拟活动，其中 TP5 负责模拟方面。该策略将使我们能够阐明几何因素（扫角、跨度）和振动的相互影响。在数值上，各个效应（有振动和无振动）可以被解耦并单独考虑。这里的基本问题是结构振动是否以及如何调节抖振（尤其是在 3D 情况下），以及是否或在什么条件下发生锁定。为此，我们利用第一阶段建立的壁模型大涡模拟方法，并扩展到通过移动网格公式引入结构运动和变形。这些高阶方法的效率使得展向域长度比之前报道的模拟显着增加。作为进一步的子目标，我们使用这种方法来阐明与第一阶段相比，这些振动调节尾流尾翼相互作用的程度。为此，我们与子项目合作伙伴对从机翼到水平安定面的整个相互作用链（包括振动）进行了耦合 AZDES-LES 模拟。我们描述了振动对总体规模的影响。因此，总体项目目标是有助于详细了解结构振动调制抖振的基本物理原理，并将这些发现转移到抖振 - 尾流 - 水平尾翼作用链中。