Wind Energy and the Turbulent Nature of the Atmospheric Boundary Layer
| Autor: | Matthias Wächter, Patrick Milan, Hendrik Heißelmann, Tanja Mücke, Joachim Peinke, Michael Hölling, Nico Reinke, Philip Rinn, Allan Morales |
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| Rok vydání: | 2011 |
| Předmět: |
Wind power
Meteorology Planetary boundary layer Process (engineering) business.industry Turbulence Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Physics - Fluid Dynamics Renewable energy supply Wind energy conversion Nonlinear Sciences::Chaotic Dynamics Physics::Fluid Dynamics Basic research Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Environmental science Atmospheric turbulence Aerospace engineering business Physics::Atmospheric and Oceanic Physics |
| Zdroj: | 6th AIAA Theoretical Fluid Mechanics Conference. |
| DOI: | 10.2514/6.2011-3299 |
| Popis: | Wind turbines operate in the atmospheric boundary layer, where they are exposed to the turbulent atmospheric flows. As the response time of wind turbine is typically in the range of seconds, they are affected by the small scale intermittent properties of the turbulent wind. Consequently, basic features which are known for small-scale homogeneous isotropic turbulence, and in particular the well-known intermittency problem, have an important impact on the wind energy conversion process. We report on basic research results concerning the small-scale intermittent properties of atmospheric flows and their impact on the wind energy conversion process. The analysis of wind data shows strongly intermittent statistics of wind fluctuations. To achieve numerical modeling a data-driven superposition model is proposed. For the experimental reproduction and adjustment of intermittent flows a so-called active grid setup is presented. Its ability is shown to generate reproducible properties of atmospheric flows on the smaller scales of the laboratory conditions of a wind tunnel. As an application example the response dynamics of different anemometer types are tested. To achieve a proper understanding of the impact of intermittent turbulent inflow properties on wind turbines we present methods of numerical and stochastic modeling, and compare the results to measurement data. As a summarizing result we find that atmospheric turbulence imposes its intermittent features on the complete wind energy conversion process. Intermittent turbulence features are not only present in atmospheric wind, but are also dominant in the loads on the turbine, i.e. rotor torque and thrust, and in the electrical power output signal. We conclude that profound knowledge of turbulent statistics and the application of suitable numerical as well as experimental methods are necessary to grasp these unique features (...) Accepted by the Journal of Turbulence on May 17, 2012 |
| Databáze: | OpenAIRE |
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