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Numerical Study of Wind Turbine Wake Aerodynamics in Uniform and Yawed Inflow
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tsalicoglou, Christina |
| Copyright Year | 2012 |
| Abstract | As global wind power capacity increases, wind park power density should be optimized with respect to wind turbine placement and operation. Wake development, interaction and superposition is expected to largely affect power output. Particularly in offshore wind parks, the region downstream of a single wind turbine is dominated by wake effects due to the typically large number of installed wind turbines and low ambient turbulence, which does not facilitate mixing [11], [25]. Detailed understanding of the characteristics of the near wake in non-uniform inflow conditions is necessary both to expand computational tools and to compare with experimental measurements. Therefore the effects of non-axisymmetric, unsteady phenomena on a wind turbine’s near wake, up to a distance of two rotor diameters downstream of the rotor plane are presented in this report, in order to create a modeling database to relate the characteristics of a single wind turbine’s near-wake to different uniform and non-uniform inflow conditions at various operating points. Numerical simulations of the turbulent flow downstream of a three-bladed wind turbine are performed by Reynolds-Averaged Navier-Stokes (RANS) modeling, using the commercial code ANSYS CFX 12.1. The simulations are based on the test series of the Model Experiments in Controlled Conditions (MEXICO), performed in 2006 by the Energy Research Center of the Netherlands (ECN) at the German Dutch Wind Tunnels [6]. Simulations are performed for both uniform and non-uniform inflow conditions at three tip-speed ratios λ = 4.17, 6.67 and 10. The effect of increasing tip-speed ratio and of yawed inflow of 30◦ are studied. Results show good agreement with the experiments. Furthermore, the centerline velocity deficit, trajectory of the tip vortices, wake expansion and flow angles are reported along with the variation of the turbulence kinetic energy across the rotor and at different downstream distances. The extent of the signature of the tower downstream of the wind turbine is also examined for different inflow conditions. |
| File Format | PDF HTM / HTML |
| DOI | 10.3929/ethz-a-010075310 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/154318/eth-8043-01.pdf |
| Alternate Webpage(s) | https://doi.org/10.3929/ethz-a-010075310 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
