New Results from the European SIROCCO Project: Silent Rotors by Acoustic Optimization
Th. Lutz, W. Würz, A. Herrig, K. Braun and E. Krämer, J.G. Schepers, A.P.W.M. Cuvers, S. Oerlemans, A. Matesanz, R. Ahrelt, T. Maeder and Herr S.
DEWEK 2006, 8th German Wind Energy Conference, Bremen, 22.-23. November 2006
The present paper gives an overview about the European SIROCCO project. The objective of the project is to investigate and to demonstrate the potential to reduce the flow-induced noise emitted from wind-turbine blades by the design of dedicated low noise airfoils. In the course of the research an airfoil noise prediction method was enhanced and applied to design airfoils for the outboard region of different baseline turbines in the 1~2 MW class. Aerodynamic and aero-acoustic wind-tunnel tests demonstrated the superior performance of the new designs. Full-scale blades with the new airfoils implemented were built by two wind-turbine companies involved in the project. Acoustic field tests applying an array measuring technique are being performed to examine the noise emission of the modified compared to the baseline blades.