Upgrade in the elastic surface algorithm for airfoil inverse design with variable attack angle via controlled leading-edge movement

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Zakaria Drafsh, Mahdi Nili-Ahmadabadi, Mohammad Hossein Noorsalehi, Ahmad Shirvani, Man Yeong Ha
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Abstract

The elastic surface algorithm (ESA) is an iterative inverse design method for airfoils, considering the airfoil wall as an elastic curved beam pinned at its beginning and ending points. This structure deforms in response to the disparity between existing and target pressure distributions. This paper introduces an improvement to the ESA, allowing controlled movement of the airfoil’s leading edge within a vertical groove. This advancement enables the adjustment of the angle of attack during the inverse design process, enhancing the airfoil’s robustness and flexibility. In contrast to a fixed angle of attack approach, the proposed method prevents unrealistic geometric features, such as airfoil fishtailing, improving convergence potential. The developed method was validated through the inverse design of NACA0012 and FX63-137 airfoils in a viscous subsonic flow regime. The flow solver was validated using existing experimental results, showing good agreement. Finally, the pressure distribution of the FX63-137 airfoil was modified to increase lift or decrease drag. The corresponding geometries were obtained via the advanced ESA method, resulting in an almost 4 % increase in the lift-to-drag ratio.

通过控制前缘运动提升弹性曲面算法,用于可变攻角机翼反设计
弹性曲面算法(ESA)是一种用于机翼的迭代反向设计方法,它将机翼壁视为在其起点和终点固定的弹性曲面梁。这种结构会随着现有压力分布与目标压力分布之间的差异而变形。本文对 ESA 进行了改进,允许机翼前缘在垂直凹槽内进行受控运动。这一进步使得在反设计过程中可以调整攻角,从而增强机翼的稳健性和灵活性。与固定攻角方法相比,所提出的方法可防止机翼鱼尾等不切实际的几何特征,从而提高收敛潜力。通过在粘性亚音速流动状态下对 NACA0012 和 FX63-137 机翼进行反设计,对所开发的方法进行了验证。利用现有的实验结果对流动求解器进行了验证,结果显示两者吻合良好。最后,对 FX63-137 机翼的压力分布进行了修改,以增加升力或减少阻力。通过先进的 ESA 方法获得了相应的几何形状,结果升阻比提高了近 4%。
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
Journal of Mechanical Science and Technology
Journal of Mechanical Science and Technology 工程技术-工程:机械
CiteScore
2.90
自引率
6.20%
发文量
517
审稿时长
7.7 months
期刊介绍: The aim of the Journal of Mechanical Science and Technology is to provide an international forum for the publication and dissemination of original work that contributes to the understanding of the main and related disciplines of mechanical engineering, either empirical or theoretical. The Journal covers the whole spectrum of mechanical engineering, which includes, but is not limited to, Materials and Design Engineering, Production Engineering and Fusion Technology, Dynamics, Vibration and Control, Thermal Engineering and Fluids Engineering. Manuscripts may fall into several categories including full articles, solicited reviews or commentary, and unsolicited reviews or commentary related to the core of mechanical engineering.
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