Effects of wing pitch kinematics on both aerodynamic and olfactory functions in an upwind surge
Effects of wing pitch kinematics on both aerodynamic and olfactory functions in an upwind surge
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DOI：
10.1177/0954406220907950
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发表时间：
2020-02-25
影响因子：
2
通讯作者：
Li, Chengyu
中科院分区：
文献类型：
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作者：
Li, Chengyu
昆虫拍打翅膀既能产生空气动力，又能增强嗅觉灵敏度，从而在气味丰富的星球上航行。尽管扑翼的空气动力学功能的广泛调查，我们有有限的了解扑翼如何潜在地影响飞行过程中的生理敏感性。本文采用直接数值模拟的方法研究了一个果蝇模型在逆风中的纵荡运动。机翼俯仰运动学是用双曲线函数来描述的，通过调整双曲线函数中的“C”因子，可以将机翼俯仰轮廓从正弦函数改变为阶跃函数。在不同的机翼俯仰运动模式下，空气动力学性能和嗅觉检测都被量化。通过在上游均匀释放被动气味示踪剂，利用拉格朗日方法可视化了扑翼对气味传输的影响。该研究表明，昆虫有可能通过调整翅膀俯仰运动学来实现更高的空气动力学性能，但它可以减少天线周围的气味质量通量。有人怀疑，自然飞行者可能会牺牲一定的空气动力学潜力，以提高他们的嗅觉灵敏度为生存目的。此外，陷阱和轻弹机制，在这里提出的旋后阶段，以提高嗅觉灵敏度。类似的夹和投掷机制，以提高力的产生在旋前阶段，新提出的陷阱和轻弹机制也是由于翼翼之间的相互作用，在扑翼飞行。这些发现可以为气味引导扑翼飞行的工程应用提供重要的启示。
Flapping wings of insects serve for both generating aerodynamic forces and enhancing olfactory sensitivities when navigating on the odor-rich planet. Despite the extensive investigations of the aerodynamic function of flapping wings, we have limited understanding of how the flapping wings potentially affect the physiological sensitivities during flight. In this paper, direct numerical simulations were used to investigate a fruit fly model in an upwind surging motion. The wing pitch kinematics were prescribed using a hyperbolic function, which can change the wing pitch profile from a sinusoidal function to a step function by adjusting the "C" factor in the hyperbolic function. Both aerodynamic performance and olfactory detections were quantified at various wing pitch kinematics patterns. The effects of flapping wings on the odor transport were visualized using the Lagrangian approach by uniformly releasing passive odor tracers in upstream. The study revealed that the insect had the potential to achieve higher aerodynamic performance by tailoring wing pitch kinematics, but it could reduce the odor mass flux around the antenna. It was suspected that the natural flyers might sacrifice certain aerodynamic potential to enhance their olfactory sensitivity for surviving purposes. In addition, a trap-and-flick mechanism is proposed here during the supination phase in order to enhance the olfactory sensitivity. Similar to the clip-and-fling mechanism for enhancing the force generation during the pronation phase, the newly proposed trap-and-flick mechanism is also due to the wing-wing interaction in flapping flight. These findings could provide important implications for engineering applications of odor-guided flapping flight.