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首页> 外文期刊>Journal of the American Helicopter Society >Performance of a Cycloidal Rotor Concept for Micro Air Vehicle Applications
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Performance of a Cycloidal Rotor Concept for Micro Air Vehicle Applications

机译:微型飞机应用中摆线转子概念的性能

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The viability of a cyclorotor for powering a hover-capable micro air vehicle (MAV) was examined by making performance and flow field measurements. Parametric studies were conducted to determine the dependence of performance on rotational speed, the amplitude of the blade pitch, the blade airfoil shape, and blade flexibility. All of the experiments were conducted using a three-bladed cyclorotor system, which was built light enough to be used on an actual flight-capable MAV. While higher blade pitch angles were found to improve performance and increase the power loading of the cyclorotor, significant bending and torsional flexibility of the blades had a deleterious effect on performance. Blade section camber also proved to be detrimental to overall performance. Force measurements showed the presence of a significant sideward force on the cyclorotor (along with the vertical thrust force), analogous to that found on a spinning circular cylinder. Particle image velocimetry (PIV) measurements made in the wake of the cyclorotor provided evidence of a significant wake skewness, which was produced by the sideward force. The thrust produced by the cyclorotor was found to increase until a blade pitch angle of 45° was reached without showing any signs of blade stall. This behavior was also explained using the PIV measurements, which indicated evidence of a stall delay as well as possible increases in lift on the blades from the presence of a leading edge vortex.
机译:通过进行性能和流场测量,检验了用于为具有悬停功能的微型飞行器(MAV)供电的回旋翼的可行性。进行了参数研究,以确定性能对转速,叶片桨距的幅度,叶片翼型形状和叶片柔韧性的依赖性。所有的实验都是使用三叶片的旋翼转子系统进行的,该系统的重量足够轻,可以用于实际的可飞行MAV。虽然发现较高的叶片俯仰角可改善性能并增加回旋转子的功率负荷,但叶片的明显弯曲和扭转挠性会对性能造成不利影响。叶片截面外倾角也被证明对整体性能有害。力的测量表明,在旋转转子上存在很大的侧向力(以及垂直推力),类似于在旋转的圆柱体上发现的侧向力。在回旋翼尾流中进行的粒子图像测速(PIV)测量提供了明显的尾流偏斜的证据,该偏斜是由侧向力产生的。发现由旋转转子产生的推力增加,直到达到桨叶俯仰角45°,而没有任何桨叶失速的迹象。使用PIV测量也可以解释这种行为,该测量表明存在失速延迟以及由于存在前缘涡流而引起的叶片升力的增加。

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