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首页> 外文期刊>Journal of Aircraft >Positive and Negative Spanwise Flow Development on an Insect-Like Rotating Wing
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Positive and Negative Spanwise Flow Development on an Insect-Like Rotating Wing

机译：像昆虫一样旋转翼上的正负跨流流动

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摘要

This paper presents an experimental investigation of the spanwise flow development on an impulsively started rotating rectangular wing at 45 deg angle of attack. Reynolds numbers of 500 and 15,000 were studied, which correspond to insect and flapping-wing micro-air-vehicle scales, respectively. Stereoscopic particle image velocimetry flowfield measurements were taken at various spanwise locations and sweep angles (angle of rotation from start) on a motor-driven rectangular wing immersed in a seeded water tank. At both Reynolds numbers, the development of the flow was characterized by the formation of strong positive (root-to-tip) and negative (tip-to-root) spanwise flows, which lost strength toward the tip and root, respectively. The negative spanwise flow appeared to be created by the tip vortex, which accelerated fluid from beyond the tip to the root and turned a portion of the positive spanwise flow back on itself, inducing a secondary vortex inboard of the tip vortex and rotating in the opposite sense. Peak positive and negative spanwise flows in both cases were on the order of the wingtip speed. The extent of negative spanwise flow formation on rectangular wings versus tapered wings, as observed in other studies, suggests that perhaps the formation of negative spanwise flow is dependent on wing geometry and the size of the tip vortex.
机译：本文提出了在45度迎角冲动启动旋转矩形机翼上翼展方向流动发展的实验研究。研究了雷诺数分别为500和15,000的雷诺数，它们分别对应于昆虫和拍打翼的微型汽车标尺。在浸没在种子水箱中的电机驱动矩形机翼上，在不同的翼展方向位置和扫掠角（从开始旋转角度）上进行了立体粒子图像测速流场测量。在两个雷诺数下，流动的发展都表现为形成强的正向（根对尖端）和负向（尖端对根）的展向流，这分别使流向尖端和根的强度降低。负涡流似乎是由尖端涡流产生的，它使流体从尖端向外流动到根部，并使正涡流的一部分转向自身，从而在尖端涡流内侧产生次级涡流，并在相反方向旋转感。在这两种情况下，正向和负向的峰值流量都在翼尖速度的数量级上。在其他研究中观察到，矩形机翼与锥形机翼上的负翼展方向流动形成的程度表明，负翼展方向流动的形成可能取决于机翼的几何形状和尖端涡旋的大小。

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  • 来源
    《Journal of Aircraft》 |2013年第5期|1321-1332|共12页
  • 作者

    Nathan Phillips; Kevin Knowles;

  • 作者单位

    Animal Flight Group, Department of Zoology, Oxford University Cranfield University, Shrivenham, England SN6 8LA, United Kingdom;

    Aeromechanical Systems Group, Cranfield University, Cranfield Defence and Security Cranfield University, Shrivenham, England SN6 8LA, 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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