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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Numerical assessment of a deformable trailing-edge flap on aerodynamic load control of a pitching S809 airfoil using OpenFOAM
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Numerical assessment of a deformable trailing-edge flap on aerodynamic load control of a pitching S809 airfoil using OpenFOAM

机译：使用OpenFOAM对俯仰S809翼型的气动载荷控制进行可变形后缘襟翼的数值评估

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Due to the unsteady nature of the flow around horizontal-axis wind turbines, the blades are subjected to severe unsteady and fatigue loads. This necessitates an in-depth aerodynamic analysis of flow control techniques to enhance the performance of a wind turbine as well as the lifetime of its components. Using OpenFOAM package in this study, a series of two-dimensional incompressible simulations are performed to present a deeper insight into the aerodynamic characteristics of an oscillating deformable trailing-edge flap, as a promising flow control device, in a sinusoidal pitching motion of an S809 airfoil. Herein, it is of particular interest to investigate the effects of deformable trailing-edge flap size, oscillation frequency, and the phase shift with reference to airfoil motion on lift and drag hysteresis loops. For this purpose, a pure-pitching motion of an S809 airfoil without flap deflection is considered as the benchmark problem in which the airfoil oscillates in the near-stall region at. After validation and verification of our simulations through comparison against the corresponding experimental and numerical work, a comprehensive investigation is conducted to study the effects of the aforementioned parameters on the aerodynamic loads. Our results reveal the fact that an out-of-phase deflection of the deformable trailing-edge flap with a frequency equal to the airfoil frequency can significantly mitigate the fatigue load. Under these circumstances, an increase in the deformable trailing-edge flap size can also help the airfoil experience less-severe loads in a cycle of motion. Furthermore, higher values of deformable trailing-edge flap frequency or other values of phase shift except the out-of-phase oscillation cannot alleviate fatigue loads. An airfoil under these conditions can, however, enhance the resultant load required for a blade rotation in the case of low wind periods.
机译：由于绕水平轴风力涡轮机流动的不稳定特性，叶片承受着严重的不稳定和疲劳载荷。这需要对流量控制技术进行深入的空气动力学分析，以增强风力涡轮机的性能及其组件的寿命。使用本研究中的OpenFOAM软件包，进行了一系列二维不可压缩的模拟，以更深刻地了解作为S809的正弦俯仰运动的振荡可变形后缘襟翼的空气动力学特性，该襟翼是一种很有前途的流量控制装置。翼型。在此，特别感兴趣的是研究可变形的后缘襟翼尺寸，振荡频率以及相对于翼型运动的升力和阻力磁滞回线的相移的影响。为此目的，不带襟翼偏转的S809机翼的纯俯仰运动被认为是基准问题，在该问题中，机翼在接近失速的区域振动。在通过与相应的实验和数值工作进行比较来验证和验证我们的模拟之后，进行了全面的研究，以研究上述参数对空气动力学载荷的影响。我们的结果揭示了这样一个事实，即频率等于机翼频率的可变形后缘襟翼的异相偏转可以显着减轻疲劳载荷。在这种情况下，可变形后缘襟翼尺寸的增加也可以帮助机翼在运动周期中承受较小的载荷。此外，除了异相振荡之外，较高的可变形后缘襟翼频率值或其他相移值不能减轻疲劳载荷。然而，在低风周期的情况下，在这些条件下的翼型可以增加叶片旋转所需的合成载荷。

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