Biomimetic and live medusae reveal the mechanistic advantages of a flexible bell margin.
Biomimetic and live medusae reveal the mechanistic advantages of a flexible bell margin.
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DOI：
10.1371/journal.pone.0048909
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Priya S
中科院分区：
文献类型：
--
作者：
Colin SP;Costello JH;Dabiri JO;Villanueva A;Blottman JB;Gemmell BJ;Priya S
灵活的钟形边缘的特征组成部分，划船水母的形态，预计将有助于其高推进效率。然而，通过柔性推进器增加推力的机械基础仍然没有得到解决，因此钟状边缘的灵活性对水母游泳的影响也仍然没有得到解决。我们使用仿生机器人水母车辆来阐明，推进推力增强灵活的水母钟形边缘依赖于流体动力学之间的相互作用，夹带的流量在前伞和流量从下的钟驱逐点。从这两个地区的流动合并导致增强流体循环，因此，推力增强灵活的边缘的水母车辆和生活水母。使用粒子图像测速（PIV）数据，我们估计的压力场，以证明与灵活的钟形边缘增强流的机械基础。具有柔性边缘的飞行器的性能通过在钟形件膨胀期间发生的涡流相互作用而进一步增强。机器人车辆和活体动物之间的流体动力学和性能相似性表明，自然界中发现的灵活边缘的推进优势可以由人类工程推进器模仿。尽管水母是描述这一过程的简单动物模型，但这些结果可能有助于了解其他动物谱系中灵活边缘的表现。
Flexible bell margins are characteristic components of rowing medusan morphologies and are expected to contribute towards their high propulsive efficiency. However, the mechanistic basis of thrust augmentation by flexible propulsors remained unresolved, so the impact of bell margin flexibility on medusan swimming has also remained unresolved. We used biomimetic robotic jellyfish vehicles to elucidate that propulsive thrust enhancement by flexible medusan bell margins relies upon fluid dynamic interactions between entrained flows at the inflexion point of the exumbrella and flows expelled from under the bell. Coalescence of flows from these two regions resulted in enhanced fluid circulation and, therefore, thrust augmentation for flexible margins of both medusan vehicles and living medusae. Using particle image velocimetry (PIV) data we estimated pressure fields to demonstrate a mechanistic basis of enhanced flows associated with the flexible bell margin. Performance of vehicles with flexible margins was further enhanced by vortex interactions that occur during bell expansion. Hydrodynamic and performance similarities between robotic vehicles and live animals demonstrated that the propulsive advantages of flexible margins found in nature can be emulated by human-engineered propulsors. Although medusae are simple animal models for description of this process, these results may contribute towards understanding the performance of flexible margins among other animal lineages.
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影响因子：
3.4
作者：
Lauder, George V.;Madden, Peter G. A.;Bozkurttas, Meliha
通讯作者：
Bozkurttas, Meliha
影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
4.6
作者：
Michelin, Sebastien;Smith, Stefan G. Llewellyn
通讯作者：
Smith, Stefan G. Llewellyn