Noise Attenuation by Half Flat tip Serrated Trailing Edge in Rotating Blades

Abstract Two rotating blade models with different half-flat tip trailing edge serrations were proposed. The flow characteristics and aerodynamic noise simulated using the large-eddy simulation model Ffowcs Williams Hawking’s acoustic analogy, respectively. effect of in reducing was investigated. Results showed that proposed serration designs can effectively reduce broadband noise, effectiveness reduction related to wavelength-to-amplitude ratio serrations. Wide-serrated had better performance, local according simulations be as high 3.3 dBA. Besides, it found performance blades not detrimentally affected by introduction serration.