The flow induced by a jellyfish
The flow induced by a jellyfish
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DOI：
10.1007/bf03181714
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发表时间：
2008-08
影响因子：
1.7
通讯作者：
S. Ichikawa;O. Mochizuki
中科院分区：
文献类型：
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作者：
S. Ichikawa;O. Mochizuki
本研究的目的是了解水母在游动过程中的推进机制。利用运动捕捉相机观察水母（Aurelia aurita）的运动，并利用粒子图像测速仪（PIV）测量水母周围的矢量流场。人们认为水母在运动的收缩阶段主要是由射流推动的。如果这是真的，那么有趣的是，水母即使在膨胀阶段也不会停止旅行。在膨胀阶段，水母体内存在一个涡度与脱落涡度相反的涡环。我们讨论了在膨胀阶段推力增加和保持恒定速度的原因。
The purpose of this study is to understand the propulsion mechanism of a jellyfish during its swimming. We observed the motion of a jellyfish (Aurelia aurita) by a motion-capture camera, and measured the vector field of flow around a jellyfish by using a PIV (Particle Image Velocimetry) measurement. A jellyfish is considered to be principally propelled by a jet at the contracting phase of its motion. If that is true, it is interesting that a jellyfish never stops traveling even at the expanding phase. We found that a vortex ring with the opposite vorticity to shed vortex ring was inside a jellyfish body in the expanding phase. We discussed a cause of an increase in thrust force and keeping constant speed in the expanding phase.