Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
A numerical simulation study on a H-Darrieus wind turbine
Submission Author:
Ramiro Bertolina , DF
Co-Authors:
Ramiro Bertolina, Rafael Castilho Faria Mendes, Antonio Brasil Junior, Taygoara Oliveira
Presenter: Ramiro Bertolina
doi://10.26678/ABCM.ENCIT2022.CIT22-0453
Abstract
Although Horizontal Axis Wind Turbines (HAWTs) are more common in wind farms for electrical generation, Vertical Axis Wind turbines (VAWTs) have gained progressively more attention because they are suitable for installation inside urban centers or in highly variable wind direction conditions. In this work, we perform a numerical study of a three-bladed H-Darrieus wind turbine. The main goal of the work is to accurately reproduce the curve of power coefficient as a function of the tip speed ratio (non-dimensional power curve) for a given condition of non-disturbed flow. A periodic stall condition characterizes the flow around H-Darrieus turbine blades, and predicting the turbulence is challenging and critical to reliable power predictions. In this way, we perform a turbulence model assessment study considering κ-ε RNG, κ-ε Standard, and κ-ω SST. The values found for the performance coefficient are compared to experimental data available in the literature. We found that all three models can describe the abrupt boundary layer separation associated with the periodic stall, but the κ-ω SST presented results closest to the experimental reference, especially for the condition at maximal power generation. We also present results for the pattern of wall shear stress related to the stall.
Keywords
VAWTs, CFD, Turbulence Model
