Trailing edge noise prediction for rotating serrated blades

S. Sinayoko, M. Azarpeyvand, B. Lyu

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Serrations have been widely studied in the case of stationary blades, as an efficient method for reducing trailing edge noise. However, most of the problems involving trailing edge noise are related to rotating blades and it is not known how rotation affects the efficiency of serrations. This paper tackles this problem using an efficient analytical model for predicting trailing edge noise radiation for rotating serrated blades. The model combines Howe's low Mach number isolated airfoil theory with Amiet's rotating airfoil technique. The paper also outlines a theory that generalizes Amiet's stationary airfoil the- ory to serrated trailing edges. Three different types of serrations - sinusoidal, sawtooth and slitted-sawtooth - are investigated for a model wind turbine blade element. The inuence of the serrations width, depth, and slits, on noise radiation is compared to known results valid for stationary blades. The best serrations are narrow (relative to the boundary layer thickness) and deep. Rotation has been found to have little impact on the performance of serrations at low Mach numbers.

Original languageEnglish
Title of host publication20th AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624102851
Publication statusPublished - 1 Jan 2014
Event20th AIAA/CEAS Aeroacoustics Conference 2014 - Atlanta, GA, United States
Duration: 16 Jun 201420 Jun 2014

Publication series

Name20th AIAA/CEAS Aeroacoustics Conference

Conference

Conference20th AIAA/CEAS Aeroacoustics Conference 2014
CountryUnited States
CityAtlanta, GA
Period16/06/1420/06/14

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