Study on influence mechanism of front hydrofoil on hydrodynamic performance of flapping fin

被引：0
|
作者：
Feng Y. [1 ]
Xu X. [1 ]
Liu B. [1 ]
Zhang G. [1 ]
机构：
[1] College of Intelligent Science and Technology, National University of Defense Technology, Changsha
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2023年 / 51卷 / 04期
关键词：
flapping fin; hydrodynamic performance; numerical simulation; vortex structure; vortex-wing interaction;
D O I：
10.13245/j.hust.230402
中图分类号：
学科分类号：
摘要：
To study the influence mechanism of two-body interference on the hydrodynamic performance of the flapping fin，the numerical study was carried out based on computational fluid dynamics (CFD) method for the hydrodynamic performance of the flapping fin in the wake of uniform incoming flow，the front hydrofoil with rigid immobility and flexible fluctuation．The variation trend of thrust coefficient，power consumption and propulsion efficiency were calculated by changing the heave amplitude and flapping frequency of the flapping fin．The influence mechanism of upstream hydrofoil on the propulsion performance of flapping fin was studied by the pressure contour，longitudinal velocity contour and vortex structure evolution characteristics． Calculation results show that the existence of upstream hydrofoil can improve the propulsion performance of the flapping fin，and the propulsion performance of the flapping fin is the best when the upstream hydrofoil performs flexible undulation motion．The vortex shed from the trailing edge of the upstream hydrofoil can merge with the attached vortex on the surface of the flapping fin and enhance the intensity of the attached vortex． A strong trailing edge vortex shed from the trailing edge of the upstream flexible undulating hydrofoil，which compresses the attached vortex on the surface of the flapping fin，improves the strength of the attached vortex and accelerates the shedding of the attached vortex. © 2023 Huazhong University of Science and Technology. All rights reserved.
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页码：10 / 17
页数：7
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