Flow Control Mechanism Investigation on Prepositive Elliptical Wing-Main Wing Composite Configuration Based on Mode Decomposition

IF 2.9 3区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

International Journal for Numerical Methods in Engineering Pub Date : 2025-07-03 DOI:10.1002/nme.70075

Xuan Bai, Hao Zhan, Xiaotong Tan, Junyao Zhang, Baigang Mi

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Abstract

The composite design of the prepositive elliptical wing-main wing configuration suppresses the flow separation on the main wing by harnessing the beneficial interference of airflow between the two wings. Employing computational fluid dynamics (CFD) and optimization technologies, the two-dimensional composite configuration enhances the overall lift-drag ratio by a remarkable value of 112.24% compared to the baseline airfoil at an angle of attack of 18°, with a 74.41% increase in the time-averaged lift-drag ratio during a pitch oscillation period. To decipher the underlying flow control principles, numerical simulation-derived transient flow field snapshots are analyzed through the proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD). For the static conditions, the vortex shedding from the elliptical wing is critical in achieving the desired flow control effects. A necessary prerequisite for the effective creation of this vortex is the slit created between the main wing and the elliptical wing. For the dynamic conditions, the airflow acceleration facilitated by the slit is the predominant factor in the flow control effectiveness of the composite configuration. The vortex shedding that takes place downstream of the elliptical wing complements this primary effect, contributing as a secondary mechanism to the overall flow control. These results reveal the distinct mechanisms behind the flow control of the composite configuration under static and dynamic stall conditions and provide a theoretical foundation for this innovative approach to flow control.

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基于模态分解的预椭圆翼-主翼复合结构流控机理研究

预椭圆翼-主翼复合设计通过利用机翼间气流的有益干涉来抑制主翼上的气流分离。利用计算流体力学（CFD）和优化技术，二维复合结构在迎角为18°时的整体升阻比比基线翼型提高了112.24%，俯仰振荡期间的时间平均升阻比提高了74.41%。通过正交分解（POD）和动态模态分解（DMD）对数值模拟得到的瞬态流场快照进行了分析，揭示了流动控制的基本原理。在静态条件下，椭圆翼的旋涡脱落是实现理想流动控制效果的关键。在主翼和椭圆翼之间形成狭缝是有效形成旋涡的必要前提。在动态条件下，狭缝带来的气流加速是影响复合结构流动控制效果的主要因素。发生在椭圆翼下游的旋涡脱落补充了这一主要效果，作为整体流动控制的次要机制。这些结果揭示了复合结构在静态和动态失速条件下流动控制的不同机制，并为这种创新的流动控制方法提供了理论基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal for Numerical Methods in Engineering 工程技术-工程：综合

CiteScore

5.70

自引率

6.90%

发文量

276

审稿时长

5.3 months

期刊介绍： The International Journal for Numerical Methods in Engineering publishes original papers describing significant, novel developments in numerical methods that are applicable to engineering problems. The Journal is known for welcoming contributions in a wide range of areas in computational engineering, including computational issues in model reduction, uncertainty quantification, verification and validation, inverse analysis and stochastic methods, optimisation, element technology, solution techniques and parallel computing, damage and fracture, mechanics at micro and nano-scales, low-speed fluid dynamics, fluid-structure interaction, electromagnetics, coupled diffusion phenomena, and error estimation and mesh generation. It is emphasized that this is by no means an exhaustive list, and particularly papers on multi-scale, multi-physics or multi-disciplinary problems, and on new, emerging topics are welcome.