An energy extracting technology based on tandem oscillating hydrofoils from flow field is presented in this paper. Numerical simulation were performed to optimize the spatial arrangement for tandem oscillating hydrofoils, the position of the downstream hydrofoil relative to the wake vortex shed by the upstream hydrofoil is seen as critical. Optimized position of the two hydrofoils improves the energy extraction performance through positive interactions between the downstream hydrofoil and the wake vortices of the upstream hydrofoil, and the highest energy extraction efficiency reaches 53.8%. The downstream hydrofoil has a slight impact on the energy extraction performance of the upstream hydrofoil, and the contribution from the upstream hydrofoil is usually slightly inferior to the single hydrofoil results. Leading edge vortex (LEV) is formed and shed from the upstream hydrofoil, which is seen as critical in the energy transformation between the fluid and the energy extraction device. For different reduced frequencies, the energy extraction of a single hydrofoil is heavily influenced by the dynamics of vortex forming and shedding. The investigation was also undertaken over a wide range of kinematic parameters, including hydrofoil separation distance and reduced frequency. Results reveal that energy extraction of tandem oscillating hydrofoils shows better performance than a single hydrofoil for optimal reduced frequency and suitable hydrofoil separation distance.
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N. Armaroli and V. Balzani, Towards an electricity-powered world, Energy Environmental Science, 4 (2011) 3193–3222.
J. Young, J. Lai and M. F. Platzer, A review of progress and challenges in flapping foil power generation, Progress in Aerospace Sciences, 67 (2014) 2–28.
Q. Xiao et al., How motion trajectory affects energy extraction performance of a biomimic energy generator with an oscillating foil, Renewable Energy, 37 (1) (2012) 61–75.
M. S. Triantafyllou, A. H. Techet and F. S. Hover, Review of experimental work in biomimetic foils, J. of Oceanic Engineering, 29 (3) (2004) 585–594.
Q. Zhu, Energy harvesting by a purely passive flapping foil from shear flows, J. of Fluids and Structures, 34 (2012) 157–169.
K. D. Jones, K. Lindsey and M. F. Platzer, An investigation of the fluid-structure interaction in an oscillating-Wing micro-hydropower generator, Advance in Fluid Mechanics, 36 (2003) 73–84.
M. F. Platzer, Development of a new oscillating-wing wind and hydropower generator, 47th AIAA Aerospace Sciences Meeting, American Institute of Aeronautics and Astronautics, Reston, Virginia (2009).
Q. Xiao and Q. Zhu, A review on flow energy harvesters based on flapping foils, J. of Fluids and Structures, 46 (2014) 174–191.
J. A. Esfahani, E. Barati and H. R. karbasian, Effect of caudal on hydrodynamic performance of flapping foil in fishlike swimming, Applied Ocean Research, 42 (2013) 32–420.
S. Rashida and J. A. Esfahani, Control of wake and vortex shedding behind a porous circular obstacle by exerting an external magnetic field, J. of Magnetism and Magnetic Materials, 385 (2015) 198–206.
H. Abiru and A. Yoshitake, Study on a flapping wing hydroelectric power generation system, J. of Environmental Engineering, 6 (1) (2011) 178–186.
H. Abiru and A. Yoshitake, Experimental study on a cascade flapping wing hydroelectric power generator, J. of Energy Power Engineering, 6 (2012) 1429–1436.
M. Ashraf, J. Young, J. Lai and M. Platzer, Numerical analysis of an oscillating-wing wind and hydropower generator, AIAA J., 49 (7) (2011) 1374–1386.
Q. Zhu, Optimal frequency for flow energy harvesting of a flapping foil, J. of Fluid Mechanics, 675 (2011) 495–517.
B. J. Simpson, Experimental studies of flapping foils for energy extraction, M.S. Thesis, Massachusetts Institute of Technology, Cambridge, MA, USA (2009).
F. S. Hover and M. S. Triantafyllou, Effect of angle of attack profiles in flapping foil propulsion, J. of Fluid Structure, 19 (1) (2004) 37–47.
T. Kinsey and G. Dumas, Optimal tandem configuration for oscillating-foils hydrokinetic turbine, J. of Fluids Engineering, 134 (2012) 1–16.
T. Kinsey and G. Dumas, Computational fluid dynamics analysis of a hydrokinetic turbine based on oscillating hydrofoils, J. of Fluids Engineering, 134 (2) (2012) 1–11.
H. R. Karbasian, J. A. Esfahani and E. Barati, Simulation of power extraction from tidal currents by flapping foil hydrokinetic turbines in tandem formation, Renewable Energy, 81 (2015) 816–824.
R. D. Radermacher, Computational analysis of a wing oscillator, M.S. Thesis, Western Michigan University (2012) 1–30.
J. Young, M. A. Ashraf, J. Lai and M. F. Platzer, Numerical simulation of fully passive flapping foil power generation, AIAA J., 51 (11) (2013) 2727–2739.
J. A. Xu and H. Y. Sun, Fluid dynamics analysis of passive oscillating hydrofoils for tidal current energy extracting, IEEE International Conference on Mechatronics and Automation (2015) 2017–2022.
T. Kinsey and G. Dumas, Parametric study of an oscillating foil in a power extraction regime, AIAA J., 46 (6) (2008) 1318–1330.
Recommended by Associate Editor Shin Hyung Rhee
Jianan Xu received his B.S, M.S and Ph.D. in Mechanical Engineering from Harbin Engineering University in 1999, 2002 and 2007, respectively. He is currently an Associate Professor at the College of Mechanical & Electrical Engineering at Harbin Engineering University, China. His research interests are in the area of marine mechatronic system, tidal current energy extraction and active heave compensation.
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Xu, J., Sun, H. & Tan, S. Wake vortex interaction effects on energy extraction performance of tandem oscillating hydrofoils. J Mech Sci Technol 30, 4227–4237 (2016). https://doi.org/10.1007/s12206-016-0835-9
- Energy extraction
- Reduced frequency
- Tandem oscillating hydrofoils
- Wake vortex interaction