Research on Aerodynamic Noise Reduction of Wind Turbine Blades Based on Tyto longimembris Bionic Tail Edge

Abstract

In this paper, CFD software is used to simulate the Fluent numerical simulation of the DU300 airfoil trailing edge and the trailing edge of DU300. Using LES turbulence model, calculating the FW-H equation, the noise transformed by FFT transform, and the sound field dist ribution of the blade aerodynamic noise is obtained, and the variation of the aerodynamic noise of the monitoring points at different locations and the attenuation law are analyzed and compared. After DU300 airfoil blunt trailing edge increasing Bionic trailing edge, the influence of a erodynamic performance of the airfoil is very small, and it has a significant effect on the noise reduction. Which provides a certain reference value for the optimization design of wind turbine airfoil, the sound field distribution of the bionic trailing edge has certain broadband characteristics. In troduction The noise of the wind turbine generator is largely derived from the aerodynamic noise. The aerodynamic noise is more complex, and it is closely related to the complex flow around the blade.in existing research, Li Dian found that owl class with unique wings airfoil and the structure of feathers has great reference value on the blade design and can effectively improve the blade a erodynamic performance and acoustic properties. So this paper starting from the perspective of e ngineering bionics, through in-depth study of the mechanism of the Grass Owl silent flight, numerical simulation and prediction of aerodynamic noise, provides a new working principle and design idea for the noise reduction technology of wind power generation. At present, the research on the trailing edge is mainly about the serrated trailing edge. Xue Weicheng on the noise reduction experiment of the serrated trailing edge, found that comparing the Airfoil with serrated trailing edge with the original airfoil, the effect of the medium low frequency and high frequency noise reduction is obvious(over 2db). This paper will be more accurate simulation of the bionic Grass Owl wing trailing edge, by getting the features of Grass Owl wings feathers trailing edge wavy edge extraction to establish the trailing edge of the wave shaped blade and explore its noise reduction performance.