Objective The energy productivity of wind turbines is increasing through improvements in availability and design. Further gains may be expected but these will diminish as the energy extraction process approaches its limit. Consideration of the overall cost of energy is more important than the energy extraction process alone, and consequently, designs must be cost effective. Improved methods of control will reduce overall energy costs and the potential of two concepts which have shown promise in early tests will be studied. These are Flap control Airjet vortex generator control. These retain the advantages of stall control but avoid problems associated with large actuator loads in a pitch controlled machine. Theoretical analyses and wind tunnel testing of these concepts will be effected. A blade set will be modified to test airjet vortex generators on a full-scale wind turbine. The targets include the optimisation of each concept, appraisal of their control characteristics, power curves and annual energy output.Through the emphasis now being placed on renewable energy sources, the wind energy sector is receiving greater interest then ever before. Future wind turbines installed in Europe are likely to be of larger rotor size and greater efficiency to obtain the highest energy yield from the limited number of sites. Europe has a large number of private firms, research institutions, goverment agencies and electric companies working in the wind energy sector. The project must then have a European basis if this expertise is to be used to its greatest advantage. Using a flap for aerodynamic control promises to combine the advantages of both stall and pitch control. The main objective is to compare flap control with existing aerodynamic control systems and compare loads and overall economy. A flap will provide precise control, simplified load paths reducing fatigue and rotor weight and requires lower actuating loads. The detailed tasks are Define control concepts to be compared Load calculations for specific critical load cases Optimisation of flap design parameters Verification of flap characteristics through wind tunnel testing Outline design of rotor blade with flap Power curve calculations and estimates of annual energy yield Overall economic calculations for each concept Airjet vortex generators may be another method of improving the performance and control of wind turbines. Airjet vortex generators delay boundary layer separation and offer an increased lift to drag ratio over the upper half of the power curve. Further gains may be realised in the post stall region if airjets can be used to tailor the power curve. The airflow for the airjets is available through natural pumping and the control system will be simple compared with pitch control. The detailed tasks are Aerofoil selection from blade as used by wind turbine manufacturer Design of airjet system using computational fluid dynamics Optimisation of airjet system through wind tunnel testing Performance calculations and estimation of annual energy yield Detailed design of ducting and control strategies Construction of blade test set Erection and testing on full scale wind turbine Analysis of operational results Fields of science engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringcontrol systemsengineering and technologymechanical engineeringvehicle engineeringaerospace engineeringaircraftsocial scienceseconomics and businesseconomicsproduction economicsproductivityengineering and technologyenvironmental engineeringenergy and fuelsrenewable energywind powernatural sciencesphysical sciencesclassical mechanicsfluid mechanicsfluid dynamicscomputational fluid dynamics Programme(s) FP3-JOULE 2 - Specific research and technological development programme (EEC) in the field of non-nuclear energy, 1990-1994 Topic(s) 030202 - Generic wind energy R&D Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator CITY UNIVERSITY Address Northampton square EC1V0HB London United Kingdom See on map EU contribution € 0,00 Participants (3) Sort alphabetically Sort by EU Contribution Expand all Collapse all DEUTSCHES WINDENERGIE - INSTITUT GMBH Germany EU contribution € 0,00 Address Ebert strasse 96 Wilhelmshaven See on map Ecotecnia Sociedad Cooperativa Catalana Ltd. Spain EU contribution € 0,00 Address 23 1,cl. amistad 08005 Barcelona See on map Technische Universität Braunschweig Germany EU contribution € 0,00 Address Schleinitzstrasse 38106 Braunschweig See on map
