Influence of the longitudinal spacing of tandem oscillating hydrofoils on power extraction
HE Guanghua1,2,3,MO Weijie1,WANG Wei2,YANG Hao2
1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. School of Ocean Engineering, Harbin Institute of Technology (Weihai), Weihai 264209, China;
3. Hydrodynamic Institute of Naval Architecture and Ocean Engineering, Shandong Institute of Shipbuilding Technology, Weihai 264209, China
Abstract:In recent years, the oscillating hydrofoil power generation device has attracted much attention in the energy field. The motion parameters and arrangements of the hydrofoils have an essential impact on power extraction. To analyze the influence of longitudinal spacing of tandem oscillating hydrofoil on power extraction and find the optimal power extraction region, based on an open source computational fluid software OpenFOAM, the dynamic mesh technology was applied to study the performance of tandem oscillating hydrofoils. It is found that when the global phase between the dual hydrofoils is about π/2, the total energy harvesting efficiency reaches the maximum, which is about 53.3%. To further improve the power extraction of the system, the longitudinal spacing of the balanced position between the upstream and downstream oscillating hydrofoils is changed to form an interlaced arrangement. When the balanced position spacing of the dual hydrofoils is 3.5 times the chord length, the power extraction efficiency of the downstream hydrofoil can reach up to 45.3%, and the performance of power extraction is significantly improved. When the hydrofoils are interlaced, the trailing vortex of the upstream hydrofoil changes the time and position of vortex shedding on the downstream hydrofoil, which affects the distribution of pressure on the surface of the hydrofoil. And this effect improves the synchronization of lift and heave motion which has a beneficial impact on power extraction. The interlaced arrangement of the dual hydrofoils has a positive effect on the power extraction of the tandem oscillating hydrofoils.
Key words: tandem hydrofoil, reduced frequency, dynamic mesh, wake vortex, interlaced arrangement
收稿日期: 2021-07-01
出版日期: 2022-09-28
引用本文:
何广华1,2,3,莫惟杰1,王威2,杨豪2. 串联式振荡水翼的纵向间距对获能的影响[J]. 振动与冲击, 2022, 41(18): 75-83.
HE Guanghua1,2,3,MO Weijie1,WANG Wei2,YANG Hao2. Influence of the longitudinal spacing of tandem oscillating hydrofoils on power extraction. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(18): 75-83.
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