Article
Measurements and Simulations of the Effect of Sawtooth Serration to Trailing-Edge Noise (en)
* Presenting author
Abstract:
The design optimization of trailing-edge serrations for noise reduction is of practical interest. In the present work, the trailing-edge noise of NACA 64-618 was measured in the acoustic wind tunnel AWB with various sawtooth serrations parameters (length=2h, wavelength=λ, and flap angle=β. Selected serrations were simulated using the WMLES solver MGLET, which resolves the wall pressure and the far-field noise using the hydrodynamic/acoustic splitting approach.Good agreement of the far-field noise and wall pressure spectra were reached between the present solver and the BANC trailing-edge noise dataset.Simulations of the serrations include two baseline NACA 64618 cases at angles of attack of α=-4° and α=0° and three serration cases with AR=2h/λ=1, β=6.1° at α=-4°; AR=2, β=6.1° and AR=2, β=11.1° at α=0°. Comparison of the preliminary simulation spectra and the measured far-field noise spectra show good agreement at α=-4°. The maximum level of noise reduction was also achieved in the simulation. Simulations at α=0° show an over-prediction of the baseline case, which subsequently produce an over-predicted noise reduction. A repeat of the simulation is currently in progress.The final paper will detail a more thorough analysis of the results. The authors are also open to offering the database for benchmark.