Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Pitch angle impact on the aerodynamic performance of a straight-blade H-Darrieus turbine
Submission Author:
Ramiro Bertolina , DF
Co-Authors:
Ramiro Bertolina, Matheus Nunes, Antonio Brasil Junior, Taygoara Oliveira
Presenter: Ramiro Bertolina
doi://10.26678/ABCM.COBEM2023.COB2023-0531
Abstract
Due to the growing interest in wind energy in urban environments, vertical axis wind turbines (VAWTs) have received more attention. These have low installation and maintenance costs and can be installed in regions with significant variations in wind direction. However, these devices still have lower power coefficients than horizontal axis wind turbines (HAWTs). For this reason, researchers are exploring ways to improve the efficiency of VAWTs by analyzing their aerodynamic performance. Tilt angle is a potential parameter to improve the performance of VAWTs. In this study, a 3-bladed straight H-Darrieus turbine with NACA 0022 symmetrical airfoils was used to investigate the variations of the power coefficient as a function of the top speed ratio and a detailed analysis of the flow field around the airfoils as a function of the tilt angle using computational fluid dynamics (CFD) calculations. Fixed tilt angles of -5°, -2.5°, -1.25°, and 0° were investigated using Navier-Stokes (URANS) calculations with unstable Reynolds mean and turbulence was modeled with the SST model $\kappa-\omega$. The results indicate that an increase of approximately 50\% in the mean value of the power coefficient can be obtained for an inclination angle of -5° at the optimum turbine operating point. These results are essential to optimize the performance of VAWTs, contributing to the greater use of this technology for wind energy production in urban environments.
Keywords
Vertical Axis Wind Turbine - VAWT, Pitch Angle, Aerodynamic performance, wind energy, Computational fluid dynamics (CFD)
