Experimental Study on Forewing-Hindwing Phasing in Hovering and Forward Flapping Flight
Experimental Study on Forewing-Hindwing Phasing in Hovering and Forward Flapping Flight
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DOI：
10.2514/1.j058335
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发表时间：
2019-09-01
期刊：
影响因子：
2.5
通讯作者：
Murozono, Masahiko
中科院分区：
文献类型：
--
作者：
Nagai, Hiroto;Fujita, Koki;Murozono, Masahiko
通过实验研究了前后翼相位差对串列扑翼悬停和前飞时的气动力、气动效率和纵向操纵力的影响。在雷诺数为7660-11400的水洞中，用动态缩尺力学模型测量了气动力和动力。实验结果表明，串列布局在悬停和慢速前飞时，除同相运动外，不利于垂直气动力和水平气动力的产生，而在后机翼引导前翼较快前飞时，垂直气动力在异相运动中增大。在悬停和前飞的所有相位差中，同相运动具有最大的气动效率，这与蜻蜓在悬停和前飞时使用的相位差不相对应。相反，在45-180度(后翼引导前翼)范围内的相位差的移动不会改变总的垂直力或水平力，但在悬停和前飞时很大程度上和单调地改变由前后翼力差引起的关于身体的俯仰力矩，这对应于蜻蜓在悬停时使用反相运动，而在前飞中使用50-130度的异相运动。
The effects of the phase difference between fore- and hindwings are experimentally investigated on the aerodynamic force, aerodynamic efficiency, and longitudinal control forces for tandem flapping wings in hovering and forward flight. The aerodynamic force and power are measured using a dynamically scaled mechanical model in a water tunnel at a Reynolds number of 7660-11,400. The experimental results indicate that a tandem configuration, except in-phase motion, is detrimental to the generation of vertical and horizontal aerodynamic forces in hovering and slow forward flight; whereas the vertical force is enhanced in out-of-phase motion when the hindwing leads the forewing in faster forward flight. In-phase motion has the largest aerodynamic efficiency of all the phase differences in hovering and forward flight, which does not correspond to the phase difference that dragonflies use in hovering and forward flight. In contrast, a shift in the phase difference in the range of 45-180 deg (hindwing leads forewing) does not change the total vertical or horizontal force but largely and monotonically changes the pitching moment about the body caused by the force difference between the fore- and hindwings in hovering and forward flight, which corresponds to the fact that dragonflies use antiphase motion in hovering and out-of-phase motion of 50-130 deg in forward flight.