Enhancement of the performance of vertical axis wind rotors with straight blades

Year 2023, , 49 - 55, 20.06.2023

Burcin Deda Altan

https://doi.org/10.26701/ems.1246352

Abstract

In this study, it has been aimed to improve the performance of vertical axis wind rotors with straight blades. For this purpose, an additional performance-enhancing setup has been used, placed in front of the vertical axis wind rotor with straight blades, in order to increase the performance. The effects on the rotor performance increase have been investigated numerically by keeping the dimensions of this performance-enhancing additional setup constant, by changing the number of blades of the straight bladed rotor and by changing the blade angles if the straight blades have been angled. Numerical analyzes performed in this study have been validated by experimental literature data. After creating the solid models required for the rotor performance analysis, the computational fluid dynamics (CFD) program ANSYS Fluent has been used. Here, studies have been carried out with two, three and four bladed rotors as the number of blades. As the blade angle, the effects of the angles between 180 and 120 have been examined. As a result of the study with the additional performance setup (APS), it has been determined that the optimum performance has been obtained with the vertical axis rotor with three blades and 150 blade angle. As a final result, it has been determined that the power coefficient obtained from the optimum vertical axis rotor with additional performance setup increased approximately 2.6 times compared to the optimum rotor without setup.

Keywords

Wind energy, Renewable energy, Vertical axis rotor, Blade design, Straight blade

References

• Mrigua, K., Toumib, A., Zemamoua, M., Ouhmmoua, B., Lahloua, Y., Aggoura, M. (2020). CFD Investigation of a new elliptical-bladed multistage Savonius rotors. International Journal of Renewable Energy Development, 9(3):383-392.
• Saad, A.S., Elwardany, A., El-Sharkawy, I.I., Ookawara, S., Ahmed, M. (2021). Performance evaluation of a novel vertical axis wind turbine using twisted blades in multi-stage Savonius rotors. Energy Conversion and Management, 235:114013.
• Alom N., Saha U.K. (2018). Performance evaluation of vent-augmented elliptical-bladed Savonius rotors by numerical simulation and wind tunnel experiments. Energy, 152:277-290.
• Manganhar, A.L., Rajpar, A.H., Luhur, M.R., Samo, S.R., Manganhar, M. (2019). Performance analysis of a savonius vertical axis wind turbine integrated with wind accelerating and guiding rotor house. Renewable Energy, 136:512-520.
• Zemamou, M., Toumi, A., Mrigua, K., Lahlou Y., Aggour M. (2020). A novel blade design for Savonius wind turbine based on polynomial bezier curves for aerodynamic performance enhancement. International Journal of Green Energy, 17(11):652-665.
• Ramarajan, J., Jayavel, S. (2022). Performance improvement in Savonius wind turbine by modification of blade shape. Journal of Applied Fluid Mechanics, 15(1):99-107.
• Gallo, L.A., Chica, E.L., Florez, E.G., Obando, F.A. (2021). Numerical and experimental study of the blade profile of a Savonius type rotor implementing a multi-blade geometry. Applied Sciences, 11:10580.
• Halmy, M.S.M., Didane, D.H., Afolabi, L.O., Al-Alimi, S. (2021). Computational fluid dynamics (CFD) study on the effect of the number of blades on the performance of double-stage Savonius rotor. CFD Letters, 13(4):1-10.
• Deda Altan, B., Atılgan, M., Ozdamar, A. (2008). An experimental study on improvement of a Savonius rotor performance with curtaining. Experimental Thermal and Fluid Science, 32:1673-1678.
• Hesami, A., Nikseresht, A.H., Mohamed, M.H. (2022). Feasibility study of twin-rotor Savonius wind turbine incorporated with a wind-lens. Ocean Engineering, 247:110654.
• Yahya, W., Ziming, K., Juan, W., Qurashi, M.S., Al-Nehari, M., Salim, E. (2021). Influence of tilt angle and the number of guide vane blades towards the Savonius rotor performance. Energy Reports, 7:3317-3327.
• Li, Y., Zhao, S., Qu, C., Tong, G., Feng, F., Zhao, B., Kotaro, T. (2020). Aerodynamic characteristics of straight-bladed vertical axis wind turbine with a curved-outline wind gathering device. Energy Conversion and Management, 203:112249.
• Brusca, S., Lanzafame, R., Messina, M. (2014). Design of a vertical-axis wind turbine: how the aspect ratio affects the turbine’s performance. International Journal Energy Environmental Engineering, 5:333-340.
• Kim, D., Gharib, M. (2013). Efficiency improvement of straight-bladed vertical-axis wind turbines with an upstream deflector. Journal of Wind Engineering and Industrial Aerodynamics, 115:48-52.
• Yao, Y.X., Tang, Z.P., Wang, X.W. (2013). Design based on a parametric analysis of a drag driven VAWT with a tower cowling. Journal of Wind Engineering and Industrial Aerodynamics, 116:32-39.
• Dragomirescu, A. (2011). Performance assessment of a small wind turbine with crossflow runner by numerical simulations. Renewable Energy, 36:957-965.
• Park, J., Jung, H., Lee, S., Park, Ji. (2015). A new building-integrated wind turbine system utilizing the building. Energies, 8:11846-11870.
• Pope, K., Rodrigues, V., Doyle, R., Tsopelas, A., Gravelsins, R., Naterer, G.F., Tsang, E. (2010). Effects of stator vanes on power coefficients of a zephyr vertical axis wind turbine. Renewable Energy, 35:1043-1051.
• Müller, G., Jentsch, M.F., Stoddart, E. (2009). Vertical axis resistance type wind turbines for use in buildings. Renewable Energy, 34:1407-1412.
• Krishnan, A., Paraschivoiu, M. (2016). 3D analysis of building mounted VAWT with diffuser shaped shroud. Sustainable Cities and Society, 27:160-166.