Abstract
Controlling turbulent flow to improve wind turbine airfoils' aerodynamic characteristics is a desirable task. The current study evaluated the potential of adding a wedge flap (WF) at the trailing edge of the NACA0021 airfoil. The effect of different WF heights and lengths on optimum height (L/H) on the aerodynamic performance and flow over the airfoil has been studied numerically using two-dimensional computational fluid dynamics simulation. The simulation solves the Reynolds-Averaged-Navier–Stokes with shear stress transport k–ω turbulent model. The results indicate that adding WF can effectively suppress flow separation and improve aerodynamic efficiency in all studied cases compared to clean airfoil. The aerodynamic performance is influenced significantly by the height of WF compared to the slight influence by the length at L/H < 1. Inclined WF achieves the highest lift and lift-to-drag values with total maximum increments of 71.67% and 45.79%, respectively, at optimum height and length with 6%c and 1%c, respectively, in comparison with the clean airfoil case. The results observed that WFs have advantages over the Gurney flaps discussed in this study. WF appears to be an effective passive flow control device that can be used in wind turbines if its dimensions are properly chosen.
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Data Availability
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
References
Akhlagi M, Ghafoorian F, Mehrpooya M, Sharifi Rizi M (2023) Effective parameters optimization of a small scale gorlov wind turbine, using CFD method. Iran J Chem Chem Eng 42(7):2311–2329. https://doi.org/10.30492/ijcce.2022.561960.5584
Anderson D, Tannehill JC, Pletcher RH (2016) Computational fluid mechanics and heat transfer. In: Computational fluid mechanics and heat transfer, 3rd edn
Asadbeigi M, Ghafoorian F, Mehrpooya M, Chegini S, Jarrahian A (2023) A 3D study of the darrieus wind turbine with auxiliary blades and economic analysis based on an optimal design from a parametric investigation. Sustainability. https://doi.org/10.3390/su15054684
Azlan F, Tan MK, Tan BT, Ismadi MZ (2023) Passive flow-field control using dimples for performance enhancement of horizontal axis wind turbine. Energy. https://doi.org/10.1016/j.energy.2023.127090
Balduzzi F, Holst D, Melani PF, Wegner F, Nayeri CN, Ferrara G, Paschereit CO, Bianchini A (2021) Combined numerical and experimental study on the use of gurney flaps for the performance enhancement of NACA0021 airfoil in static and dynamic conditions. J Eng Gas Turbines Power 143(2):4. https://doi.org/10.1115/1.4048908
Bangga G, Hutani S, Heramarwan H (2021) The effects of airfoil thickness on dynamic stall characteristics of high-solidity vertical axis wind turbines. Adv Theory Simul. https://doi.org/10.1002/adts.202000204
Bechert DW, Meyer R, Hage W (2000) Drag reduction of airfoils with miniflaps. Can we learn from dragonflies? In: Fluids 2000 conference and exhibit. https://doi.org/10.2514/6.2000-2315
Belamadi R, Settar A, Chetehouna K, Ilinca A (2022) Numerical modeling of horizontal axis wind turbine: aerodynamic performances improvement using an efficient passive flow control system. Energies. https://doi.org/10.3390/en15134872
Bloy AW, Tsioumanis N, Mellor NT (1997) Enhanced aerofoil performance using small trailing-edge flaps. J Aircr. https://doi.org/10.2514/2.2210
Boyd JA (1985) Trailing edge device for an airfoil. United States Patent, Patent Number: 4,542,868, 1–6
Daróczy L, Janiga G, Petrasch K, Webner M, Thévenin D (2015) Comparative analysis of turbulence models for the aerodynamic simulation of H-Darrieus rotors. Energy 90:680–690
Du L, Ingram G, Dominy RG (2019) Experimental study of the effects of turbine solidity, blade profile, pitch angle, surface roughness, and aspect ratio on the H-Darrieus wind turbine self-starting and overall performance. Energy Sci Eng. https://doi.org/10.1002/ese3.430
Farajyar S, Ghafoorian F, Mehrpooya M, Asadbeigi M (2023) CFD investigation and optimization on the aerodynamic performance of a savonius vertical axis wind turbine and its installation in a hybrid power supply system: a case study in Iran. Sustainability. https://doi.org/10.3390/su15065318
Florin F, Horia D, Alexandru D (2014) Numerical investigations of dynamic stall control. INCAS Bull 6(Special 1):67–80. https://doi.org/10.13111/2066-8201.2014.6.S1.8
Ghazali MI, Harun Z, WanGhopa WA, Abbas AA (2016) Computational fluid dynamic simulation on NACA 0026 airfoil with V-groove riblets. Int J Adv Sci Eng Inf Technol. https://doi.org/10.18517/ijaseit.6.4.901
Giguère P, Dumas G, Lemay J (1997) Gurney flap scaling for optimum lift-to-drag ratio. AIAA J. https://doi.org/10.2514/2.49
Hand B, Kelly G, Cashman A (2017) Numerical simulation of a vertical axis wind turbine airfoil experiencing dynamic stall at high Reynolds numbers. Comput Fluids. https://doi.org/10.1016/j.compfluid.2017.02.021
Holst D, Balduzzi F, Bianchini A, Church B, Wegner F, Pechlivanoglou G, Ferrari L, Ferrara G, Nayeri CN, Paschereit CO (2019a) Static and dynamic analysis of a NACA 0021 airfoil section at low reynolds numbers based on experiments and computational fluid dynamics. J Eng Gas Turbines Power. https://doi.org/10.1115/1.4041150
Holst D, Church B, Pechlivanoglou G, Tüzüner E, Saverin J, Nayeri CN, Paschereit CO (2019b) Experimental analysis of a NACA 0021 airfoil section through 180-deg angle of attack at low Reynolds numbers for use in wind turbine analysis. J Eng Gas Turbines Power. https://doi.org/10.1115/1.4041651
Holst D, Church B, Wegner F, Pechlivanoglou G, Nayeri CN, Paschereit CO (2019c) Experimental analysis of a NACA 0021 airfoil under dynamic angle of attack variation and low Reynolds numbers. J Eng Gas Turbines Power. https://doi.org/10.1115/1.4041146
Jha SK, Gautam U, Pawar P, Narayanan S, Kumaraswamidhas LA (2020) Investigations of flow phenomena over a flat plate and NACA0012 airfoil at high angles of attack. Iran J Sci Technol Trans Mech Eng. https://doi.org/10.1007/s40997-019-00313-z
Lee T (2009) Aerodynamic characteristics of airfoil with perforated Gurney-type flaps. J Aircr. https://doi.org/10.2514/1.38474
Li Y, Wang J, Zhang P (2002) Effects of Gurney flaps on a NACA0012 airfoil. Flow Turbul Combust. https://doi.org/10.1023/A:1015679408150
Li Q, Maeda T, Kamada Y, Hiromori Y, Nakai A, Kasuya T (2017) Study on stall behavior of a straight-bladed vertical axis wind turbine with numerical and experimental investigations. J Wind Eng Ind Aerodyn. https://doi.org/10.1016/j.jweia.2017.02.005
Liebeck RH (1978) Design of subsonic airfoils for high lift. J Aircr. https://doi.org/10.2514/3.58406
Meyer R, Hage W, Bechert DW, Schatz M, Thiele F (2006) Drag reduction on gurney flaps by three-dimensional modifications. J Aircr. https://doi.org/10.2514/1.14294
Michna J, Rogowski K, Bangga G, Hansen MOL (2021) Accuracy of the gamma re-theta transition model for simulating the DU-91-W2-250 airfoil at high reynolds numbers. Energies. https://doi.org/10.3390/en14248224
Mohamed MH (2012) Performance investigation of H-rotor Darrieus turbine with new airfoil shapes. Energy 47(1):522–530. https://doi.org/10.1016/j.energy.2012.08.044
Mohammadi M, Doosttalab A, Doosttalab M (2012) The effect of various gurney flap shapes on the performance of wind turbine airfoils. In: ASME early career technical conference, 11 November (2012)
Myose R, Heron I, Papadakis M (1996) The post-stall effect of Gurney flaps on a NACA-0011 airfoil. SAE Techn Pap. https://doi.org/10.4271/961316
Neuhart DH, Pendergraft IC (1988) Water tunnel study of Gurney Flaps. In: NASA technical memorandum (Issue 4071).
Ni L, Miao W, Li C, Liu Q (2021) Impacts of Gurney flap and solidity on the aerodynamic performance of vertical axis wind turbines in array configurations. Energy. https://doi.org/10.1016/j.energy.2020.118915
Özkan M, Erkan O (2022) Control of a boundary layer over a wind turbine blade using distributed passive roughness. Renew Energy. https://doi.org/10.1016/j.renene.2021.11.082
Paraschivoiu I (2002) Wind turbine design: with emphasis on Darrieus concept. Presses inter Polytechnique
Ramlee MF, Fazlizan A, Mat S (2020) Performance evaluation of H-type Darrieus vertical axis wind turbine with different turbine solidity. J Comput Theor Nanosci 17(2–3):833–839
Rezaeiha A, Montazeri H, Blocken B (2018a) Characterization of aerodynamic performance of vertical axis wind turbines: impact of operational parameters. Energy Convers Manag. https://doi.org/10.1016/j.enconman.2018.05.042
Rezaeiha A, Montazeri H, Blocken B (2018b) Toward optimal aerodynamic design of vertical axis wind turbines: impact of solidity and number of blades. Energy 165:1129–1148. https://doi.org/10.1016/j.energy.2018.09.192
Rezaeiha A, Montazeri H, Blocken B (2019) On the accuracy of turbulence models for CFD simulations of vertical axis wind turbines. Energy 180:838–857. https://doi.org/10.1016/j.energy.2019.05.053
Richter K, Rosemann H (2002) Experimental investigation of trailing-edge devices at transonic speeds. Aeronaut J 106(1058):185
Storms BL, Jang CS (1994) Lift enhancement of an airfoil using a Gurney flap and vortex generators. J Aircr. https://doi.org/10.2514/3.46528
Timmer WA, Van Rooij RPJOM (2003) Summary of the Delft University wind turbine dedicated airfoils. J Sol Energy Eng Trans ASME. https://doi.org/10.1115/1.1626129
Troolin DR, Longmire EK, Lai WT (2006) Time resolved PIV analysis of flow over a NACA 0015 airfoil with Gurney flap. Exp Fluids. https://doi.org/10.1007/s00348-006-0143-8
Wang H, Zhang B, Qiu Q, Xu X (2017) Flow control on the NREL S809 wind turbine airfoil using vortex generators. Energy. https://doi.org/10.1016/j.energy.2016.11.003
Wang S, Ingham DB, Ma L, Pourkashanian M, Tao Z (2010) Numerical investigations on dynamic stall of low Reynolds number flow around oscillating airfoils. Comput Fluids 39(9):1529–1541
White F, Xue H (2021) Fluid mechanics, 9th edn. McGraw-Hill Education, New York
Yan Y, Avital E, Williams J, Cui J (2020) Performance improvements for a vertical axis wind turbine by means of gurney flap. J Fluids Eng Trans ASME. https://doi.org/10.1115/1.4044995
Zhong J, Li J, Guo P, Wang Y (2019) Dynamic stall control on a vertical axis wind turbine aerofoil using leading-edge rod. Energy. https://doi.org/10.1016/j.energy.2019.02.176
Zhu H, Hao W, Li C, Ding Q, Wu B (2018) A critical study on passive flow control techniques for straight-bladed vertical axis wind turbine. Energy. https://doi.org/10.1016/j.energy.2018.09.072
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The research is funded by the Universiti Kebangsaan Malaysia under the Research University Grant (GUP-2023-064).
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Abdalkarem, A.A.M., Fazlizan, A., Muzammil, W.K. et al. The Effect of Various Wedge Flap Configurations on the Performance of Wind Turbine Airfoil. Iran J Sci Technol Trans Mech Eng (2024). https://doi.org/10.1007/s40997-023-00743-w
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DOI: https://doi.org/10.1007/s40997-023-00743-w