Scaling laws for the propulsive performance of three-dimensional pitching propulsors
Scaling laws for the propulsive performance of three-dimensional pitching propulsors
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DOI：
10.1017/jfm.2019.334
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发表时间：
2018-10
影响因子：
3.7
通讯作者：
F. Ayancik;Q. Zhong;D. Quinn;Aaron Brandes;H. Bart-Smith;K. Moored
中科院分区：
文献类型：
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作者：
F. Ayancik;Q. Zhong;D. Quinn;Aaron Brandes;H. Bart-Smith;K. Moored
给出了自航或定速三维刚性推进器在俯仰运动下推力产生和能量学的标度规律。该比例关系扩展了Moored & Quinn （AIAA J., 2018, pp. 1-15）中提出的二维比例律，考虑了有限跨推进器的附加质量、推进器尾涡系统的下洗/上洗效应以及脱落尾缘涡的椭圆拓扑。在与生物动力推进相关的降低频率、斯特劳哈尔数和长径比范围内，通过自推进无粘模拟和定速实验验证了新型三维标度定律。尺度定律阐明了俯仰生物推进器推力产生和能量学背后的主导流动物理，为生物推进系统的设计提供了指导。
Scaling laws for the thrust production and energetics of self-propelled or fixed-velocity three-dimensional rigid propulsors undergoing pitching motions are presented. The scaling relations extend the two-dimensional scaling laws presented in Moored & Quinn (AIAA J., 2018, pp. 1–15) by accounting for the added mass of a finite-span propulsor, the downwash/upwash effects from the trailing vortex system of a propulsor and the elliptical topology of shedding trailing-edge vortices. The novel three-dimensional scaling laws are validated with self-propelled inviscid simulations and fixed-velocity experiments over a range of reduced frequencies, Strouhal numbers and aspect ratios relevant to bio-inspired propulsion. The scaling laws elucidate the dominant flow physics behind the thrust production and energetics of pitching bio-propulsors, and they provide guidance for the design of bio-inspired propulsive systems.