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Improving Airfoil Drag Prediction

机译:改进翼型阻力预测

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摘要

An improved formulation of drag estimation for thick airfoils is presented. Drag underprediction in XFOIL-like viscous-inviscid interaction methods can be quite significant for thick airfoils used in wind turbine applications (up to 30%, as seen in the present study). The improved drag formulation predicts the drag accurately for airfoils with reasonably small trailing-edge thicknesses. The derivation of drag correction is based on the difference between the actual momentum loss thickness based on freestream velocity and that based on the velocity at the edge of the boundary layer. The improved formulation is implemented in the most recent versions of XFOIL and RFOIL (an aerodynamic design and analysis method based on XFOIL, developed by a consortium of the Energy Research Centre of the Netherlands, the National Aerospace Laboratory/NLR, and the Delft University of Technology after the Energy Research Centre of the Netherlands acquired the XFOIL code; after 1996, the Energy Research Centre of the Netherlands maintained and improved the tool), and the results are compared with experimental data, results from commercial computational fluid dynamics methods like ANSYS CFX, as well as other methods like the Technical University of Denmark Aeroelastic Design Section (AED)'s EllipSys2D and the National Renewable Energy Centre (CENER)'s Wind Multiblock. The improved version of RFOIL shows good agreement with the experimental data.
机译:提出了一种改进的厚翼型阻力估计公式。对于风轮机应用中使用的厚翼型,XFOIL样的粘性-无粘相互作用方法中的阻力预测不足可能非常重要(如本研究中所示,高达30%)。改进的阻力公式可精确预测后缘厚度较小的机翼的阻力。阻力修正的推导基于基于自由流速度的实际动量损失厚度与基于边界层边缘速度的动量损失厚度之间的差。改进的公式在XFOIL和RFOIL的最新版本(基于XFOIL的空气动力学设计和分析方法,由荷兰能源研究中心,国家航空航天实验室/ NLR和美国代尔夫特大学联合开发的一种方法中实施)中得以实现。荷兰能源研究中心获得XFOIL代码后的技术; 1996年之后,荷兰能源研究中心对工具进行了维护和改进),并将结果与​​实验数据进行了比较,这些结果来自商业计算流体动力学方法(如ANSYS CFX)以及其他方法,例如丹麦技术大学的空气弹性设计部门(AED)的EllipSys2D和国家可再生能源中心(CENER)的Wind Multiblock。改进的RFOIL版本与实验数据显示出良好的一致性。

著录项

  • 来源
    《Journal of Aircraft》 |2016年第6期|1844-1852|共9页
  • 作者单位

    Energy Res Ctr Netherlands, Wind Energy Unit, Westerduinweg 3, NL-1755 LE Petten, Netherlands|AIAA, Reston, VA 20191 USA;

    Energy Res Ctr Netherlands, Wind Energy Unit, Westerduinweg 3, NL-1755 LE Petten, Netherlands|AIAA, Reston, VA 20191 USA;

    Univ Twente, Dept Mech Engn, Engn Fluid Dynam, POB 217, NL-7500 AE Enschede, Netherlands|AIAA, Reston, VA 20191 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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