樽海鞘链状群体游泳的流体动力学优势。
Hydrodynamic advantages of swimming by salp chains.
作者信息
Sutherland Kelly R, Weihs Daniel
机构信息
Oregon Institute of Marine Biology, University of Oregon, Eugene, OR, USA
Department of Aerospace Engineering and Autonomous Systems Program, Technion, Haifa, Israel.
出版信息
J R Soc Interface. 2017 Aug;14(133). doi: 10.1098/rsif.2017.0298.
Salps are marine invertebrates comprising multiple jet-propelled swimming units during a colonial life-cycle stage. Using theory, we show that asynchronous swimming with multiple pulsed jets yields substantial hydrodynamic benefit due to the production of steady swimming velocities, which limit drag. Laboratory comparisons of swimming kinematics of aggregate salps ( and ) using high-speed video supported that asynchronous swimming by aggregates results in a smoother velocity profile and showed that this smoother velocity profile is the result of uncoordinated, asynchronous swimming by individual zooids. flow visualizations of swimming wakes revealed that another consequence of asynchronous swimming is that fluid interactions between jet wakes are minimized. Although the advantages of multi-jet propulsion have been mentioned elsewhere, this is the first time that the theory has been quantified and the role of asynchronous swimming verified using experimental data from the laboratory and the field.
樽海鞘是一种海洋无脊椎动物，在群体生命周期阶段由多个喷气推进的游泳单元组成。通过理论分析，我们发现多个脉冲喷气式的异步游泳由于产生稳定的游泳速度而带来显著的水动力优势，这限制了阻力。使用高速视频对群体樽海鞘（ 和 ）游泳运动学进行的实验室比较支持了群体的异步游泳会产生更平滑的速度剖面这一观点，并表明这种更平滑的速度剖面是个体游动孢子不协调、异步游泳的结果。 游泳尾流的流动可视化显示，异步游泳的另一个结果是喷气尾流之间的流体相互作用最小化。尽管多喷气推进的优势在其他地方已有提及，但这是首次对该理论进行量化，并利用来自实验室和实地的实验数据验证了异步游泳的作用。
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