Numerical Simulation Study on the Near Wake of Wind Turbine Nacelles Under Turbulent Wind Conditions
The nacelle wind speed of horizontal-axis wind turbines is a crucial signal parameter for units control,influenced by the inflow turbulence and the near wake of the wind turbine,making its variability complex and significantly impacting the optimization of wind turbine control. This paper utilizes Computational Fluid Dynamics(CFD)methods for an in-depth analysis of the near wake of turbine nacelles under turbulent wind conditions. It compares the structure of the near wake,the distribution of nacelle wind speeds,and their effects on the overall performance of wind turbines under both uniform and turbulent conditions. The study finds that the overall performance of wind turbines shows multi-scale fluctuations in response to turbulent conditions. In turbulence,the time series of the filtered nacelle wind speed demonstrates a strong correlation with the time series of the incoming wind speed. For both turbulent and uniform conditions,the rotation of blades/rotor has the most significant impact on the fluctuations in nacelle wind speeds. Turbulent wind conditions increase the fluctuation frequency of nacelle wind speeds,amplify the fluctuation amplitude,and weaken the impact of turbine rotation on the wake and nacelle wind speeds. Turbulent wind conditions also complicate the flow structure around the nacelle. Flow separation occurs at the blade root on the suction side under both uniform and turbulent conditions,with increased turbulence intensity making the flow separation at the blade root more pronounced.
万方数据
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