고영각에서 물결모양 전단을 갖는 NACA0021 익형의 유동특성에 대한 수치해석적 연구
Numerical Study on the Flow Characteristics of the NACA0021 Airfoil with Wavy Leading Edge at High Angles of Attack
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초록
When the blade of a wind turbine is in stall at a high angle of attack, the flow field is characterized by flow separation over the suction surface of the blade. The flow under high angle of attack causes dynamic instability of the blade and the drop of the lift. A modified NACA 0021 airfoil was used as a passive control method for flow separation in this study. The modified airfoil has a leading edge with a wavy shape. Current unsteady numerical analysis using Spalart-Allmaras Detached Eddy Simulation (SA DES) was conducted to predict the aerodynamic characteristics of the modified NACA 0021 airfoil. This investigation provides a comparison of the aerodynamic characteristics between the baseline model and the undulated model of the NACA 0021 airfoil. The undulated blade used in this study produced higher lift as compared with the baseline model at high angles of attack.
Abstract
When the blade of a wind turbine is in stall at a high angle of attack, the flow field is characterized by flow separation over the suction surface of the blade. The flow under high angle of attack causes dynamic instability of the blade and the drop of the lift. A modified NACA 0021 airfoil was used as a passive control method for flow separation in this study. The modified airfoil has a leading edge with a wavy shape. Current unsteady numerical analysis using Spalart-Allmaras Detached Eddy Simulation (SA DES) was conducted to predict the aerodynamic characteristics of the modified NACA 0021 airfoil. This investigation provides a comparison of the aerodynamic characteristics between the baseline model and the undulated model of the NACA 0021 airfoil. The undulated blade used in this study produced higher lift as compared with the baseline model at high angles of attack.
참고문헌 (9)
- Abbott, I. H., "Theory of Wing Sections" (1959), DOVER PUBLICATIONS, INC
- 문현기, "CFD를 활용한 MW급 풍력발전기 블레이드 와류 발생기 형상 최적화 및 공력 특성 분석", 풍력에너지저널, 12(2), pp.30~36 (2021), 한국풍력에너지학회
- Fish, F. E, "The tubercles on humpback whales' flippers: application of bio-inspired technology", Integrative and comparative biology, 51(1), pp.203~213 (2011)
- Favier, J., "Control of the separated flow around an airfoil using a wavy leading edge inspired by humpback whale flippers", Comptes Rendus M´ecanique, Elsevier Masson, 340, pp.107~114 (2012)
- Skillen, A., "Investigation of wing stall delay effect due to an undulating leading edge:an les study", International symposium on turbulence and shear flow phenomena (2013)
- LES, "Advances in DNS", pp.1997, Spalart, P. R.
- Hansen, K. L., "Performance Variations of Leading-Edge Tubercles for Distinct Airfoil Profiles", AIAA JOURNAL, 49(1), pp.185~194 (2011)
- Aerodynamic Characteristics of Seven Symmetric Airfoil Sections Through 180-Degree Angle of Attack for use in aerodynamics of vertical axis wind turbines, "Sheidahl, R. E.", Sandia National Laboratories, 60~62, pp.SAND-8O-2114 (1981)
- Devinant, Ph., "Experimental study of wind-turbine airfoil aerodynamics in high turbulence", Journal of Wind Engineering and Industrial Aerodynamics, 90(6), pp.689~707 (2002)