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Performance Measurements of a 1/6-Scale Model of the 1907 Cornu Rotor

机译：1907年Cornu转子1/6比例模型的性能测量

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摘要

Measurements of the performance of an approximate 1/6-scale Cornu 1907 rotor system are discussed. The rotor was tested in hover, both in and out of ground effect, over a range of rotational speeds and collective blade pitch angles. The measurements showed that the rotor had low aerodynamic efficiency, with a maximum attainable figure of merit of only about 0.35 for out of ground effect operating conditions. An analysis of the measurements showed that the performance of this rotor is dominated by relatively high induced losses, with an average induced power factor of over two, mainly because of the use of low-aspect-ratio blades. Extrapolation of the performance polar back to zero thrust with the aid of modified momentum theory suggests that the average profile drag coefficient for the blade sections was of the order of 0.1. However, even with the benefits of a proper airfoil section of lower drag, it is shown that without also using a blade design of higher aspect ratio, the figure of merit of the Cornu rotor design could not be improved much above 0.4. The measured results confirm previous modeling assumptions used for the aerodynamic and performance analysis of the Cornu rotor design and conclusions drawn regarding the unfeasibility of successful free flights of the Cornu helicopter.
机译：讨论了大约1/6比例的Cornu 1907转子系统性能的测量。在一定范围的转速和叶片总桨距角范围内，对转子的悬空，地面效应和地面效应进行了测试。测量结果表明，转子的空气动力学效率低，对于地面效应工况，其最大可获品质因数仅为0.35。对测量的分析表明，该转子的性能主要由较高的感应损耗决定，平均感应功率因数超过2，这主要是由于使用了低纵横比的叶片。借助改进的动量理论，将性能极推回零推力，表明叶片截面的平均轮廓阻力系数约为0.1。然而，即使具有较低风阻的合适的翼型截面的益处，也显示出，如果不还使用高纵横比的叶片设计，则Cornu转子设计的品质因数不能大大提高到0.4以上。测量结果证实了先前用于Cornu旋翼设计的空气动力学和性能分析的建模假设，以及关于Cornu直升机无法成功自由飞行的结论。

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  • 来源
    《Journal of the American Helicopter Society》 |2012年第3期|p.032001.1-032001.5|共5页
  • 作者

    Benjamin Hance; J. Gordon Leishman; Joseph Milluzzo;

  • 作者单位

    Department of Aerospace Engineering, Glenn L. Martin Institute of Technology University of Maryland, College Park, MD;

    Department of Aerospace Engineering, Glenn L. Martin Institute of Technology University of Maryland, College Park, MD;

    Department of Aerospace Engineering, Glenn L. Martin Institute of Technology University of Maryland, College Park, MD;

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