Scaling laws for the propulsive performance of a purely pitching foil in ground effect
Scaling laws for the propulsive performance of a purely pitching foil in ground effect
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DOI：
10.1017/jfm.2021.361
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发表时间：
2020-11
影响因子：
3.7
通讯作者：
A. Mivehchi;Q. Zhong;Melike Kurt;D. Quinn;K. Moored
中科院分区：
文献类型：
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作者：
A. Mivehchi;Q. Zhong;Melike Kurt;D. Quinn;K. Moored
摘要本文给出了纯俯仰水翼在地面效应作用下产生推力和消耗功率的比例律。这是第一次，地面效应的比例法则的基础上的物理见解捕获的推进性能在广泛的生物相关的斯特劳哈尔数，无量纲振幅和无量纲地面距离。这是通过推进先前的标度定律（Moored & Quinn（AIAA J.，2018年，第页1-15）），并对增加的质量和循环力进行物理驱动的修改，以考虑地面距离的变化。所介绍的关键物理学是在地面附近的翼片的附加质量的增加和尾涡系统的影响的减少，由于其图像系统的影响。的比例律被发现是在良好的协议与新的无粘模拟和粘性实验，并可用于加速设计的生物启发水翼附近的地平面或两个异相箔在并排的安排振荡。
Abstract Scaling laws for the thrust production and power consumption of a purely pitching hydrofoil in ground effect are presented. For the first time, ground-effect scaling laws based on physical insights capture the propulsive performance over a wide range of biologically relevant Strouhal numbers, dimensionless amplitudes and dimensionless ground distances. This is achieved by advancing previous scaling laws (Moored & Quinn (AIAA J., 2018, pp. 1–15)) with physics-driven modifications to the added mass and circulatory forces to account for ground distance variations. The key physics introduced are the increase in the added mass of a foil near the ground and the reduction in the influence of a wake-vortex system due to the influence of its image system. The scaling laws are found to be in good agreement with new inviscid simulations and viscous experiments, and can be used to accelerate the design of bio-inspired hydrofoils that oscillate near a ground plane or two out-of-phase foils in a side-by-side arrangement.