Aeroacoustic Optimization of Wind Turbine Airfoils by Combining Thermographic and Acoustic Measurement Data
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چکیده
The noise emissions of wind turbines lead to extensive problems for manufacturers as the approval process and the development site are influenced. Against this back ground the industry requires immediate action. Due to legal requirements and acceptance problems of wind tur bines in the population, acoustic emissions are a signifi cant issue for manufacturers. Over the last decade the average rotor diameter of onshore wind turbines increased from approximately 27 m to 82 m. In 2011 a maximum diameter of 126 m was achieved [1]. With increasing rotor diameter, the noise emission increases as well. It acts as an aerodynamic brake and significantly reduces the potential energy yield. Many wind turbines are planned with techni cal compromises favoring the reduction of noise emissions over power output. The acousticaerodynamic optimiza tion of rotor blades could reduce these negative effects of the technical compromises and increase the efficiency. With current methods, a fast threedimensional mapping of the noise sources with respect to the flow conditions on the surface of rotor blades is implemented satisfactorily neither in wind tunnels nor for wind turbines. In this article first results of a combined measuring method for the acousticaerodynamic optimization of rotor blades for wind turbines are presented. The method combines thermographic data for turbulence boundary layer analysis with the measurement data of an acoustic camera. Thus, the amplitudes and frequencies of the threedimensional acoustic emission field can be associated with the geome try of the rotor blade and the inflowconditions. Thermographic measurement systems detect the temper ature distribution of the rotor blade surface. The surface temperature is influenced by a variety of parameters and can be correlated to the air flow.
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