| Knowing the wind speed is the crucial factor for the control of a wind turbine. Because of its design cheap and its practicality, an anemometer mounted on the nacelle of a horizontal axis wind turbine is the most promising technique for measuring wind speed and consequently for energy production management in a wind farm. However, this measurement often contains various errors. This project consists in building a model to examine the atmospheric turbulence around a wind turbine and to assess the impact of the presence of the rotor on the flow field. To build this model, the rotor is modeled using the disc actuator theory. The blade element theory is used to determine the efforts on the disk surface and then estimate the pressure drop through the rotor. The flow field is modeled with the average Navier-Stokes equations. Numerical simulations are done with the meshing software ICEM-CFD and the solver Fluent, both from ANSYS. This model, depending on the position chosen for the anemometer, gives the correlations between the nacelle wind speed and the free stream wind speed. The benefits of this project are the improvement of the wind turbine performance and its control. In future works, this model could be used to study turbulence and wake phenomena, ground topography effects or to build a module for wind farms simulation.;Keywords: anemometer, wind, wind energy, fluid dynamics, meshing, numerical simulation. |
