Numerical Investigation of Installed Rod Effects in Front of an ASymmetric Blade section of Vertical Axis Wind Trubine

Authors

1 Ferdowsi University of Mashhad Department of Mechanical Engineering

2 faculty of engineering, ferdowsi university on mashhad

Abstract

The Darrieus wind turbine is a lift-based vertical axis wind turbine which has been considered because of simplicity in design and its independency from wind direction. In this study, the effect of a rod mounted on the blade leading edge on the aerodynamic performance of the turbine has been investigated, and various parameters such as torque coefficient and power coefficient have been studied. Ansys Fluent software is used to simulate the turbine. Furthermore, two-dimensional computational fluid dynamics method and k-ω SST turbulence model are used. According to the results, the prespce of the rod causes a delay in flow separation and increases the output torque and power of the turbine. This phoenemon in symmetrical blades can increase the torque at high tip speed ratios between 2.5 to 3.5, which results in an increase in the power coefficient. Also using this rod, the generating power increases by 23% at the tip speed ratio of 3.2, and the optimum tip speed ratio is shifted from 2.7 to 3.2, which results in an increase in turbine efficiency. Applying rod on asymmetric blades as opposed to symmetric blades not only improves the low power efficiency but also solves the problem of turbine self-starting Darrieus turbine.

Keywords

References

[1] Ashrafi ZN, Ghaderi M, Sedaghat A (2015)  Parametric study on off-design aerodynamic performance of a horizontal axis wind turbine blade and proposed pitch control. Energy Convers 93: 349-356.
[2] Zamani M, Maghrebi MJ, Varedi SR (2016)  Starting torque improvement using J-shaped straight-bladed Darrieus vertical axis wind turbine by means of numerical simulation. Renew Energy  95: 109-126.‏‏
[3] Marie DGJ (1931) Turbine having its rotating shaft transverse to the flow of the current. edn: Google Patents.
[4] Hashem I, Mohamed M (2018) Aerodynamic performance enhancements of H-rotor Darrieus wind turbine. Energy 142: 531-545.‏‏
[5] Zamani M, Maghrebi MJ, Moshizi SA (2016)  Numerical study of airfoil thickness effects on the performance of J-shaped straight blade vertical axis wind turbine. Wind Struct Int J 22(5): 595-616.
[6] Chen CC, Kuo CH (2013) Effects of pitch angle and blade camber on flow characteristics and performance of small-size Darrieus VAWT. J Vis 16(1): 65-74.
[7] Timmer W, Van Rooij R (2003) Summary of the Delft University wind turbine dedicated airfoils. J Sol Energy Eng 125(4): 488-496.
[8] Takao M, Kuma H, Maeda T, Kamada Y, Oki M, Minoda A (2009) A straight-bladed vertical axis wind turbine with a directed guide vane row—Effect of guide vane geometry on the performance—. J Therm Sci 18(1): 54-57.
[9] Chougule PD, Rosendahl L, Nielsen SR (2015) Experimental study of the effect of a slat angle on double-element airfoil and application in vertical axis wind turbine. Sh Offshore Struct 10(2): 176-182.‏
[10] Sobhani E, Ghaffari M, Maghrebi MJ (2017) Numerical investigation of dimple effects on darrieus vertical axis wind turbine. Energy 133: 231-241.
[11] Ismail MF, Vijayaraghavan K (2015) The effects of aerofoil profile modification on a vertical axis wind turbine performance. Energy 80: 20-31.
[12] Zhang L, Zhang S, Wang K, Liu X, Liang Y (2011) Study on synchronous variable-pitch vertical axis wind turbine. In 2011 APPEEC 1-5.
[13] He Y, Agarwal RK (2014) Shape optimization of NREL S809 airfoil for wind turbine blades using a multiobjective genetic algorithm. Int J Aerosp 2014.
[14] Amet E, Maître T, Pellone C, Achard JL (2009) 2D numerical simulations of blade-vortex interaction in a Darrieus turbine. J Fluids Eng 131(11).
[15] Castelli MR, Englaro A, Benini E (2011) The Darrieus wind turbine: Proposal for a new performance prediction model based on CFD. Energy 36(8): 4919-4934.
[16] Blazek J (2015) Computational fluid dynamics: Principles and applications. Butterworth-Heinemann.
[17] Nobile R, Vahdati M, Barlow J, Mewburn-Crook A (2011) Dynamic stall for a vertical axis wind turbine in a two-dimensional study. Renew Energ 4225-4232.
[18] Sagharichi A, Maghrebi MJ, ArabGolarcheh A (2016) Variable pitch blades: An approach for improving performance of Darrieus wind turbine. J Renew Sustain Energy 8(5): 053305.
[19] Srinivasan G, Ekaterinaris J, McCroskey W (1995) Evaluation of turbulence models for unsteady flows of an oscillating airfoil. Comput Fluids 24(7): 833-861.
[20] Islam M, Ting DSK, Fartaj A (2008) Aerodynamic models for Darrieus-type straight-bladed vertical axis wind turbines. Renew Sust Energ 12(4): 1087-1109.
Journal of Solid and Fluid Mechanics
Volume 11, Issue 4
November and December 2021
Pages 107-120

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