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Lifting-Line Analysis for Twisted Wings and Washout-Optimized Wings

机译:扭曲翼和优化冲蚀翼的提升线分析

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摘要

A more practical form of the analytical solution for the effects of geometric and aerodynamic twist (washout) on the low-Mach-number performance of a finite wing of arbitrary planform is presented. This infinite series solution is based on Prandtl's classical lifting-line theory and the Fourier coefficients are presented in a form that only depends on wing geometry. The solution shows that geometric and aerodynamic washout do not affect the lift slope for a wing of any planformshape. This solution also shows that any wing with washout always produces induced drag at zero lift. Except for the special case of an elliptic planform, washout can be used to reduce the induced drag for a wing producing finite lift. A relation describing the optimum spanwise distribution of washout for a wing of arbitrary planform is presented. If this optimum washout distribution is used, a wing of any planform shape can be designed for a given lift coefficient to produce induced drag at the same minimum level as an elliptic wing with the same aspect ratio and no washout.
机译:提出了一种更实用的形式的解析解决方案,用于几何和气动扭转(冲刷)对任意平面有限翼的低马赫数性能的影响。该无限级数解基于Prandtl的经典升力线理论,并且傅立叶系数以仅取决于机翼几何形状的形式表示。该解决方案表明,几何形状和空气动力冲刷不会影响任何平面形状机翼的升力斜率。该解决方案还表明,任何带有冲刷的机翼总是在零升力时产生感应阻力。除了椭圆形平面的特殊情况外,冲刷可用于减少产生有限升力的机翼的感应阻力。提出了描述任意平面机翼冲刷的最佳翼展方向分布的关系。如果使用这种最佳的冲刷分布,则可以针对给定的升力系数设计任何平面形状的机翼,以在与椭圆形机翼相同的最小水平和相同的纵横比且没有冲刷的情况下产生感应阻力。

著录项

  • 来源
    《Journal of Aircraft》 |2004年第1期|p.128-136|共9页
  • 作者

    W. F. Phillips;

  • 作者单位

    Utah State University, Logan, Utah 84322-4130;

  • 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
  • 中图分类 航空;
  • 关键词

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