Objective Objectives and problems to be solved:Despite the fast acceleration of wind energy implementation, wind turbine noise is still one of the major obstacles for the widespread use of wind energy in Europe. For modern large turbines, aerodynamic (in particular trailing edge) noise is considered to be the dominant noise source. The principal objective of the present project is to develop airfoils and possible other concepts, by which the aerodynamic noise of full-scale wind turbine blades can be reduced considerably (say 3-6 dB), without a reduction in power performance. The airfoils will be designed using a new combined acoustic-aerodynamic design methodology. This methodology is based on the method from the previous EU-project 'DATA' to design acoustic blades for a wind tunnel model rotor. In the present project the method will be extended for the full-scale situation. The performance of the turbines will be validated using a new measurement technique, which can localise and quantify noise sources on a rotating blade.Description of the work:The project will be carried out by a balanced consortium, which brings together the major European experience and knowledge in the required fields. The consortium consists of a major blade and leading wind turbine manufacturer, a wind energy consultancy company, and Europe's leading research institutes in the field of wind turbine acoustics and aerodynamics.The project is aimed at two different (reference) turbines, for which acoustically optimised blades will be designed, manufactured and validated in field tests. Both reference turbines are pitch controlled and have a diameter of about 60 m. The activities performed in SIROCCO can be roughly divided in the following phases. In the first phase, acoustic field measurements are carried out to characterise the noise sources on both baseline turbines. Using the acoustic array measurement technique, it will be verified whether indeed trailing edge noise is the dominant noise source. (Milestone 1). If other noise sources are present (e.g. gear box, tip noise, holes/slits), it will be attempted to reduce or eliminate these noise sources. In the second phase, a combined acoustic/aerodynamic design methodology will be utilised to design acoustically optimised airfoils. The new airfoils should be compatible to the inner blades of the baseline turbines, while maintaining the aerodynamic requirements. The optimised airfoils are tested in two-dimensional aerodynamic and acoustic wind tunnel tests and compared to the reference airfoils, for varying conditions (Milestone 2). In the third phase the design of full-scale rotor blades with the new airfoils will be performed. Using analytical tools, it will be assessed how promising the new designs will be (Milestone 3). In the fourth phase the full-scale optimised blades will be manufactured, after which their acoustic and aerodynamic performance with respect to the baseline blades is verified in detailed field measurements for varying conditions. On the basis of the experimental results a final evaluation and assessment of the business potential of the new blades will be performed for both turbines.Expected results:The final result of SIROCCO is a set of validated full-scale, low-noise rotor blades for both reference turbines, with the same power performance as the existing blades. This final result will be accomplished through a number of intermediate results, such as a validated design methodology for low-noise airfoils, and a proven acoustic measurement technique for location and quantification of rotating noise sources. Fields of science engineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaircraftengineering and technologyenvironmental engineeringenergy and fuelsrenewable energywind powernatural sciencesphysical sciencesacousticsengineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaeronautical engineering Programme(s) FP5-EESD - Programme for research, technological development and demonstration on "Energy, environment and sustainable development, 1998-2002" Topic(s) 1.1.4.-5. - Key action Cleaner Energy Systems, including Renewable Energies Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator N/A Address See on map EU contribution € 0,00 Participants (5) Sort alphabetically Sort by EU Contribution Expand all Collapse all COMPOSITE TECHNOLOGY CENTRE BV Netherlands EU contribution € 0,00 Address Bedrijvenpark twente, 301 7602 KL Almelo See on map GAMESA EOLICA SA Spain EU contribution € 0,00 Address Poligono industrial los agustinos s/n 31003 Pamplona See on map NOI-ROTORTECHNIK GMBH Germany EU contribution € 0,00 Address Kohnsteinbruecke 10 99734 Nordhausen See on map STICHTING NATIONAAL LUCHT- EN RUIMTEVAART LABORATORIUM Netherlands EU contribution € 0,00 Address Anthony fokkerweg 2, 1059 cm amsterdam 1006 BM Amsterdam See on map UNIVERSITAET STUTTGART Germany EU contribution € 0,00 Address 21,pfaffenwaldring 21 70585 Stuttgart See on map
