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Influence of Blade Aerodynamic Model on Prediction of Helicopter Rotor High-Frequency Airloads

机译：叶片气动模型对直升机旋翼高频载荷预测的影响

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摘要

Brown's vorticity transport model has been used to investigate the influence of the blade aerodynamic model on the accuracy with which the high-frequency airloads associated with helicopter blade-vortex interactions can be predicted. The model yields an accurate representation of the wake structure yet allows significant flexibility in the way that the blade loading can be represented. A simple lifting-line model and a somewhat more sophisticated lifting-chord model, based on unsteady thin aerofoil theory, are compared. A marked improvement in the accuracy of the predicted high-frequency airloads of the higher harmonic control aeroacoustic rotor is obtained when the lifting-chord model is used instead of the lifting-line approach, and the quality of the prediction is affected less by the computational resolution of the wake. The lifting-line model overpredicts the amplitude of the lift response to blade-vortex interactions as the computational grid is refined, exposing the fundamental deficiencies in this approach when modeling the aerodynamic response of the blade to interactions with vortices that are much smaller than its chord. The airloads that are predicted using the lifting-chord model are relatively insensitive to the resolution of the computation, and there are fundamental reasons to believe that properly converged numerical solutions may be attainable using this approach.
机译：布朗的涡度传输模型已用于研究叶片空气动力学模型对精度的影响，该精度可预测与直升机叶片涡旋相互作用相关的高频空气负荷。该模型可以精确地表示出尾流结构，但在表示叶片载荷方面具有很大的灵活性。比较了基于不稳定薄翼型理论的简单起吊线模型和稍微复杂一些的起吊弦模型。当使用提升弦模型而不是提升线方法时，高次谐波控制的航空声波转子的预测高频空气载荷的准确性有了显着提高，并且预测的质量受到计算的影响较小唤醒的分辨率。提升线模型会在优化计算网格时过度预测升力对叶片-涡旋相互作用的响应幅度，从而在建模叶片对与小于其弦的旋涡相互作用的空气动力学响应进行建模时，暴露了该方法的基本缺陷。使用提升弦模型预测的空载对计算的分辨率相对不敏感，并且有基本的理由认为使用此方法可以实现适当收敛的数值解。

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  • 来源
    《Journal of Aircraft》 |2011年第2期|p.476-494|共19页
  • 作者

    Mary E. Kelly; Richard E. Brown;

  • 作者单位

    University of Glasgow, Glasgow, Scotland G12 8QQ, United Kingdom;

    University of Strathclyde, Glasgow, Scotland Gl 1XJ, United Kingdom;

  • 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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