The influence of aerodynamic noise distribution law of wind turbine with double fork tip structure under different yaw angles
In order to study the distribution law of aerodynamic noise of wind turbine with double forked tip structure under different yaw angles,the distribution law of aerodynamic noise of wind turbine with double forked blade tip structure at 0°-30° yaw angle is calculated by numerical simulation method.The results show that under different yaw angles,the trajectory of tip vortex and center vortex deviates,and the included angle with the rotating surface of the wind turbine increases with the increase of yaw angle;the low frequency band within 300 Hz is the main concentration area of aerodynamic noise energy,and its value first increases and then decreases with the increase of yaw angle;the larger the yaw angle is,the closer the position of the maximum sound pressure level is to the rotating axis along the blade spanwise,along the axial direction of the blade,the sound pressure level decreases with the increase of the axial distance.The calculated results are consistent with the variation law of flow field velocity and sound pressure level obtained from wind tunnel tests,which verifies the reliability of its numerical research,and provides data support and experimental verification for the low-noise design of small wind turbine blades.
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