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Review of NACA 0012 turbulent trailing edge noise data at zero angle of attack

Review of NACA 0012 turbulent trailing edge noise data at zero angle of attack

Con J. Doolan, Danielle J. Moreau (2013)

Proceedings of the 5th International Meeting on Wind Turbine Noise, Denver, Colorado, 28 - 30 August

Abstract:

Turbulent trailing edge noise is one of the most important sources of noise from wind turbines. Most of the understanding concerning the physics of turbulent trailing edge noise comes from experimental data obtained using NACA 0012 airfoil profiles in anechoic wind tunnel facilities. Further, nearly all semi-empirical models used for design purposes are based or validated against this data set. This paper compares turbulent trailing edge data for NACA 0012 airfoils from a variety of wind tunnel facilities as well as some modern computational studies. Even though the comparison is limited to zero angle of attack, the results are able to show the limitations of the current data set and the accuracy of two semi-empirical noise models. There is reasonable agreement across different data sets at moderate Reynolds numbers, but there is limited agreement at higher Reynolds numbers. With the design Reynolds number for modern and future wind turbine blades now exceeding the Reynolds number of the test data, there is a need to perform new experiments and update our existing prediction models.

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