被动变形对 NACA0012 机翼模型升力系数的影响

IF 2.5 3区 工程技术 Q2 MECHANICS European Journal of Mechanics B-fluids Pub Date : 2024-02-17 DOI:10.1016/j.euromechflu.2024.02.007
E. Duran , M. Lorite-Díez , N. Konovalov-Shishov , P. Gutierrez-Castillo , C. del Pino
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引用次数: 0

摘要

轻质材料在航空器机翼中的广泛应用涉及到结构柔性现象,这种现象会产生不可忽略的变形效应。这种影响不仅限于大型飞机,在小型飞机和无人驾驶飞行器(UAV)中也同样存在。在这里,我们通过风洞实验来分析被动变形对机翼模型升力斜率的影响。为了隔离变形效应,我们将刚性机翼与施加规定跨度变形的 NACA0012 翼面进行了比较。我们研究了三种变形水平:未变形、翼尖挠度约为 2% 和 4.5%。此外,我们还通过使用三种不同的半宽比(1、2 和 4)来考虑翼长的影响,因此在雷诺数从 到 的范围内共分析了九个刚性翼模型。与未变形的机翼相比,变形机翼模型的升力系数有所增加。两种变形程度的升力增量在本质上相似。预测平板升力系数斜率的相关性适用于 NACA0012 翼面,并利用我们的实验结果和文献数据进行了验证。调整后的相关性可以量化变形对升力斜率的影响,这与使用稍长的机翼模型相当。
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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Influence of passive deformation in the lift coefficient of a NACA0012 wing model

The extensive use of lightweight materials in aerial vehicle wings involves structural flexibility phenomena that generate non-negligible deformation effects. This influence is not restricted to big aircraft but also plays a role in smaller aeroplanes and Unmanned Aerial Vehicles (UAVs). Here, we conduct wind tunnel experiments to analyze the effect of passive deformation on the wing model lift slopes. To isolate the deformation effect, we compare rigid wings with a NACA0012 airfoil imposing a prescribed spanwise deformation. We study three levels of deformation: non-deformed, around 2% and 4.5% of tip deflection. Also, we consider the effect of the wing length by using three different semi-aspect ratios (1, 2, and 4), so a total of nine rigid wing models have been analyzed for a range of Reynolds number from 80×103 to 160×103. Deformed wing models show an increase in lift coefficient compared to non-deformed wing cases. Both deformation levels exhibit a qualitatively similar lift increment. A correlation to predict lift coefficient slope in a flat plate is adapted for a NACA0012 airfoil and validated using our experimental results and literature data. The adjusted correlation can quantify the deformation effect on the lift slope, which is comparable to using a slightly longer wing model.

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来源期刊
CiteScore
5.90
自引率
3.80%
发文量
127
审稿时长
58 days
期刊介绍: The European Journal of Mechanics - B/Fluids publishes papers in all fields of fluid mechanics. Although investigations in well-established areas are within the scope of the journal, recent developments and innovative ideas are particularly welcome. Theoretical, computational and experimental papers are equally welcome. Mathematical methods, be they deterministic or stochastic, analytical or numerical, will be accepted provided they serve to clarify some identifiable problems in fluid mechanics, and provided the significance of results is explained. Similarly, experimental papers must add physical insight in to the understanding of fluid mechanics.
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