Open AccessValidations and improvements of airfoil trailing‐edge noise prediction models using detailed experimental data
Author(s) -
Kamruzzaman M.,
Lutz Th.,
Würz W.,
Shen W. Z.,
Zhu W. J.,
Hansen M. O. L.,
Bertagnolio F.,
Madsen H. Aa.
Publication year - 2012
Publication title -
wind energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.743
H-Index - 92
eISSN - 1099-1824
pISSN - 1095-4244
DOI - 10.1002/we.505
Subject(s) - airfoil , boundary layer , turbulence , aerodynamics , trailing edge , noise (video) , wind tunnel , acoustics , detached eddy simulation , large eddy simulation , naca airfoil , leading edge , computational fluid dynamics , physics , mechanics , aerospace engineering , engineering , reynolds averaged navier–stokes equations , computer science , reynolds number , artificial intelligence , image (mathematics)
This paper describes an extensive assessment and a step by step validation of different turbulent boundary‐layer trailing‐edge noise prediction schemes developed within the European Union funded wind energy project UpWind. To validate prediction models, measurements of turbulent boundary‐layer properties such as two‐point turbulent velocity correlations, the spectra of the associated wall pressure fluctuations and the emitted trailing‐edge far‐field noise were performed in the laminar wind tunnel of the Institute of Aerodynamics and Gas Dynamics, University of Stuttgart. The measurements were carried out for a NACA 64 3 ‐418 airfoil, at Re = 2.5 ×10 6 , angle of attack of −6° to 6°. Numerical results of different prediction schemes are extensively validated and discussed elaborately. The investigations on the TNO‐Blake noise prediction model show that the numerical wall pressure fluctuation and far‐field radiated noise models capture well the measured peak amplitude level as well as the peak position if the turbulence noise source parameters are estimated properly including turbulence anisotropy effects. Large eddy simulation based computational aeroacoustic computations show good agreements with measurements in the frequency region higher than 1 kHz, whereas they over‐predict the sound pressure level in the low‐frequency region. Copyright © 2011 John Wiley & Sons, Ltd.