Abstract
The scope of the paper is to present an efficient numerical method that predicts: (a) wind turbine aerodynamic loads and power; (b) wind turbine noise source; (c) long distance wind turbine noise source propagation. The numerical methods involved in this study are a combination of Computational Fluid Dynamics (CFD) and wind turbine aeroacoustic methods. The results from the CFD simulation provide necessary information of wind turbine power and thrust etc. The 2D Actuator Disc (AD) theory is applied for such a purpose. The computational efficiency becomes very high while using a steady 2D CFD approach. The flow geometry at each blade element is required for wind turbine noise source calculations. The predicted wind turbine noise source is the starting field for long distance noise propagation model which is based on solving the Parabolic Equations (PE) in the frequency domain. Results showed that the integrated wind turbine flow-acoustic prediction method is capable of calculating wind turbine aerodynamic, aerodynamic noise source and long range sound propagation.
Highlights
Numerous methods exist for evaluation of wind turbine aerodynamics
The predicted wind turbine noise source is the starting field for long distance noise propagation model which is based on solving the Parabolic Equations (PE) in the frequency domain
Results showed that the integrated wind turbine flow-acoustic prediction method is capable of calculating wind turbine aerodynamic, aerodynamic noise source and long range sound propagation
Summary
Numerous methods exist for evaluation of wind turbine aerodynamics. Momentum (BEM) method [1] is the main engineering tool that predicts the aerodynamic loading for a single wind turbine. The vortex wake (VW) methods and the CFD methods are more advanced tools that can predict both aerodynamic loads and the flowfield around wind turbines. In the field of wind turbine aerodynamic study, the sophisticated methods called AD/AL/AS (Actuator Disc/Actuator Line/Actuator Surface) techniques are good trade-off between numerical accuracy and computational efficiency. Considering Horizontal Axis Wind Turbines (HAWTs), there is an inherent axisymmetric characteristic of the rotor. If an axisymmetric boundary condition is applied to the NS equations, the resulted flowfield should be identical to the 3D flowfield. It is worth mentioning that the statement of axisymmetric only holds true for a turbine in uniform inflow condition without yawing, tilting effects etc
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