当前位置: X-MOL 学术Bioinspir. Biomim. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Locomotor transition: how squid jet from water to air.
Bioinspiration & Biomimetics ( IF 3.4 ) Pub Date : 2020-03-30 , DOI: 10.1088/1748-3190/ab784b
T G Hou 1 , X B Yang , T M Wang , J H Liang , S W Li , Y B Fan
Affiliation  

The amazing multi-modal locomotion of flying squid helps to achieve fast-speed migration and predator-escape behavior. Observation of flying squid has been rarely reported in recent years, since it is challenging to clearly record the flying squid's aquatic-aerial locomotion in marine environment. The existing reports of squid-flying events are rare and merely record the in-air motion. Therefore, the water-air locomotor transition of flying squid is still unknown. This paper proposes the idea of usingCFDto simulate the process of the flying squid (Sthenoteuthis oualaniensis) launching from water into air. The results for the first time reveal the flow field information of squid in launching phase and show the kinematic parameters of flying squid in quantification. Both trailing jet and pinch-off vortex rings are formed to generate launching thrust, and the formation numberLω/Dωis 5.22, demonstrating that the jet strategy is to produce greater time-averaged thrust rather than higher propulsion efficiency. The results also indicate that the maximum flying speed negatively correlates with the launch angle, indicating that a lower launch angle could result in a larger flying speed for the flying squid to escape. These findings explore the multi-modal locomotion of flying squid from a new perspective, helping to explain the trade-off strategy of water-to-air transition, and further enhance the performance of aquatic-aerial vehicles.

中文翻译:

运动过渡:鱿鱼如何从水喷射到空气。

乌贼惊人的多模式运动有助于实现快速迁移和掠食者逃逸行为。近年来,鲜有观察到乌贼的报道,因为要清楚地记录乌贼在海洋环境中的水上运动是有挑战性的。现有的关于鱿鱼飞行事件的报道很少,仅记录了空中运动。因此,乌贼的水-空气运动过渡仍然是未知的。本文提出了利用CFD模拟乌贼(Sthenoteuthis oualaniensis)从水飞入空中的过程的想法。结果首次揭示了鱿鱼在发射阶段的流场信息,并定量显示了鱿鱼的运动学参数。尾随的涡流环和夹断的涡流环均形成以产生发射推力,且地层数Lω/Dω为5.22,这表明射流策略是产生更大的时均推力而不是更高的推进效率。结果还表明,最大飞行速度与发射角呈负相关,表明较低的发射角可能导致较大的飞行速度,从而使鱿鱼逃逸。这些发现从一个新的角度探讨了鱿鱼的多模式运动,有助于解释水到空气过渡的权衡策略,并进一步提高水上飞行器的性能。结果还表明,最大飞行速度与发射角呈负相关,表明较低的发射角可能导致较大的飞行速度,从而使鱿鱼逃逸。这些发现从一个新的角度探讨了鱿鱼的多模式运动,有助于解释水到空气过渡的权衡策略,并进一步提高水上飞行器的性能。结果还表明,最大飞行速度与发射角呈负相关,表明较低的发射角可能导致较大的飞行速度,从而使鱿鱼逃逸。这些发现从一个新的角度探索了鱿鱼的多模式运动,有助于解释水到空气过渡的权衡策略,并进一步提高水上飞行器的性能。
更新日期:2020-04-20
down
wechat
bug