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Effect of flapping trajectories on the dragonfly aerodynam- ics

机译：拍打轨迹对蜻蜓空气动力学的影响

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摘要

The effects of translational, figure-eight and double-figure-eight flapping trajectories on the dragonfly aerodynamics were numerically studied by solving the Navier-Stokes equations. There is a common characteristic regarding the lift/drag force coefficients that the downstroke flapping provides the lift forces while the upstroke flapping creates the thrust forces for different flapping trajectories. The maximum lift force coefficient exceeds five for the iranslational trajectory. It is greater than six for the figure-eight and double-figure-eight flapping trajecto ries, which is sufficiently larger than unity under the steady state flight condition. The ellipse and dou-tble-figure-eight flapping trajectories yield the de-crease of the lift force, while the figure-eight flapping trajectory yields higher lift force as well as the thrust force than the translational flapping one. During thetinsect flight, the wing flapping status should be changed instantaneously to satisfy various require-merits. Study of the flapping trajectories on the insect aerodynamics is helpful for the design of the Mi-tcro-air-vehicles (MAVs).
机译：通过求解Navier-Stokes方程，数值研究了平移，八字形和八字形拍打轨迹对蜻蜓空气动力学的影响。关于升力/阻力力系数有一个共同的特征，即下冲程拍板提供升力，而上冲程拍板为不同的拍打轨迹产生推力。对于无规轨迹，最大升力系数超过5。对于八字形和双八字形拍打轨迹，该值大于六，在稳态飞行条件下，该轨迹远大于一。椭圆形和双八字形拍打轨迹会产生升力的减小，而八字形拍打轨迹会产生比平移拍打更高的升力和推力。在昆虫飞行期间，机翼拍打状态应立即更改，以满足各种要求。对昆虫空气动力学扑动轨迹的研究有助于微动能飞机的设计。

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