摘要: If wind turbines are to be large contributors for energy production, a large amount of turbines have to be erected. As the areas suitable for wind energy production are limited, an optimum use of these areas are needed. For that r... 展开 If wind turbines are to be large contributors for energy production, a large amount of turbines have to be erected. As the areas suitable for wind energy production are limited, an optimum use of these areas are needed. For that reason wind turbines have to be localised in larger or smaller wind farms. Localizing wind turbines in cluster will lead to interference between them, reducing the wind speed and generating heightened loads on downstream sited turbines. In order to build suitable wind turbines, the loads have to be investigated properly. For that reason it is important to get as good understanding of the wake behaviour as possible. In this report a simple numerical model is used to calculate the near wake of a turbine. The purpose is to study the initial structure of the wake. A major part of the turbulence in the wake is generated from the shear originated from the difference in air velocity inside and outside the wake. As the velocity deficit determines the shear generated turbulence, the structure and magnitude of the deficit at the rotor is of importance for the development of the wake. Full-scale measurements in a wind farm consisting of four turbines have been performed on the island Gotland, Sweden. For one wind direction the wake at a down wind distance of one diameter can be measured. Comparisons between model and full-scale measurements are presented in this paper, which consists of four parts. First is a section describing the theory for the numerical model. Next section presents the site for the full-scale measurements. In section 3 the numerical results are presented. Finally in section 4 results from full-scale measurements are presented. 12 refs, 23 figs 收起