Hydrodynamic characteristics of cambered NACA0012 for flexiblewing application of a flapping-type tidal stream energy harvesting system
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In recent years, nonlinear dynamic models have been developed for flapping-type energy harvesting systems with a rigid wing, but not for those with a flexible wing. Thus, in this study, flexible wing designs of NACA0012 section are proposed and measurements of the forces of rigid cambered wings, which are used to estimate the performance of the designed wings, are conducted. Polar curves from the measured lift and drag coefficients show that JavaFoil estimation is much closer to the measured values than Eppler over the entire given range of angles of attack. As the camber of the rigid cambered wings is increased, both the lift and drag coefficients increase, in turn increasing the resultant forces. Moreover, the maximum resultant forces for all rigid cambered wings are achieved at the same angle of attack as the maximum lift coefficient, meaning that the lift coefficient is dominant in representations of the wing characteristics.
Abstract
In recent years, nonlinear dynamic models have been developed for flapping-type energy harvesting systems with a rigid wing, but not for those with a flexible wing. Thus, in this study, flexible wing designs of NACA0012 section are proposed and measurements of the forces of rigid cambered wings, which are used to estimate the performance of the designed wings, are conducted. Polar curves from the measured lift and drag coefficients show that JavaFoil estimation is much closer to the measured values than Eppler over the entire given range of angles of attack. As the camber of the rigid cambered wings is increased, both the lift and drag coefficients increase, in turn increasing the resultant forces. Moreover, the maximum resultant forces for all rigid cambered wings are achieved at the same angle of attack as the maximum lift coefficient, meaning that the lift coefficient is dominant in representations of the wing characteristics.
참고문헌 (11)
- Anderson, J. D., "Introduction to Flight" (1989), McGraw-Hill
- Anderson, J. D., "Fundamentals of Aerodynamics" (2010), McGraw-Hill
- "JavaFoil User's Guide" (2014)[URL]
- Kim, J., "Experimental and numerical study of a dual configuration for a flapping tidal current generator", Bioninspir. Biomim, 10, pp.046015~ (2015)
- Kinsey, T., "Three-dimensional effects on an oscillating-foil hydrokinetic turbine", J. Fluid Eng, 134, pp.071105~ (2012)
- Le, Q. L., "Effect of hydrofoil flexibility on the power extraction of a flapping tidal generator via two-and three-dimensional flow simulations", Renew. Energy, 80, pp.275~285 (2015)
- Liu, W., "A bio-inspired study on tidal energy extraction with flexible flapping wings", Bioninspir. Biomim, 8, pp.036011~ (2013)
- Aerodynamic Characteristics of Seven Symmetrical Airfoil Sections Through 180-Degree Angle of Attack for Use In Aerodynamic Analysis of Vertical Axis Wind Turbines, "Sheidahi, R. E.", United States of America, ~ (1981)
- Sitorus, P. E., "Design, implementation, and power estimation of a lab-scale flapping-type turbine", J. Mar. Sci. Technol, 21, pp.115~128 (2015)
- Truong, Q. T., "Nonlinear dynamic model for flapping-type tidal energy harvester", J. Mar. Sci. Technol, 19, pp.406~414 (2014)
- Zhu, Q., "Optimal frequency for flow energy harvesting of a flapping foil", J. Fluid Mech, 675, pp.495~517 (2011)