| Popis: |
In the present work, a 2D numerical study, using the k-e Standard and k-e EARSM turbulence models, has been carried out to determine which turbulence model better predicts the performance of the experimental Darrieus turbine test model. The computational fluid dynamics (CFD) was done for a vertical water Darrieus turbine (VAHT), with three NACA0020 straight blades, rotating at five different RPM (96, 115, 145, 175 and 215 rpm) in a closed duct and water flowing at V = 0.55 m/s. At first, a grid analysis for three different grid sizes has been carried out to determine the minimum one required to ensure a good and acceptable prediction of the performance of this turbine test model. Then, the determined numerical forces results were used to calculate the torque, mechanical power and torque and power coefficients. The comparison of these results with the experimental ones has shown, after a detailed analysis, that overall the k-e Standard turbulence model ensure a better performance prediction for this Darrieus turbine model under the given flow and turbine working conditions. |
