Cfd modelling of h-darrieus vertical axis wind turbine
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Tonni thesis fulltext
6.1 SUMMARY OF THE WORK
In this thesis, a 2D simulation of a H- Darrieus Vertical Axis Wind Turbine is done using one of the most popular CFD software package, namely, ANSYS. Several simulations were run at different tip speed ratios. The moment coefficient was obtained from these simulations. The moment coefficients obtained at different time steps were then averaged for up to two revolutions in the steady state of the turbine rotation. Then the obtained average power co-efficient is multiplied by the corresponding tip speed ratio. And thus power coefficient of the corresponding tip speed ratio was obtained. In this way, the results obtained were used to draw a performance curve. One of the main objectives of this thesis is the validation of the simulated result. The validation was done with results of a study available in the literature. Cp vs λ curves can be used in wind turbine design to determine the rotor power for any combination of wind and rotor speed. They provide immediate information on the maximum rotor power coefficient and optimum tip speed ratio. The Cp vs λ curve of the literature was compared with the one obtained from the simulated results. Thus validation of the simulation was done which shows the results match considerably. Prior to the simulation, two important studies were done. One is mesh (grid) independent study another one is the time independent study. Both the studies are very important to get a good result from the simulation sand also to obtain results with optimum computational effort with efficiency. This efficiency reduces both computational cost and time. 6.2 CONCLUSION Lastly, it can be concluded that: In this project, the 2D simulation of a H-Darrieus VAWT was done using Computational Fluid Dynamics (CFD) simulation software Fluent. Cp vs λ curve obtained from the simulation matches considerably with the experimental data. Sliding Mesh model was used which takes into account the vortices generated by the blades 54 passing upwind on the blades downstream unlike over-simplified MRF model. Prior to the simulation, mesh independent and time independent study was done not only to validate the result but also to reduce the computational effort This study can be used for design optimization and performance improvement of wind turbine Download 2.47 Mb. Do'stlaringiz bilan baham: |
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