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Hydrobond
RIBLET
FOC
Coatings for the Aeronautic Industry
PROCETS
TECNIOSPRING EUROPEAN PROJECT
CPT Opportunities

RIBLET



  Acronym
: RIBLET4WIND

  TitleRIBLET-SURFACES FOR IMPROVEMENT OF EFFICIENCY OF WIND TURBINES 

  Programme: HORIZON 2020. PILLAR 3-SOCIETAL CHALLENGES. SC3-ENERGY. Secure, Clean and Efficient Energy

  COORDINATOR: FRAUNHOFER IFAM

PARTNERS: Fraunhofer IFAM, Bionic Surface, Eltronic, E.ON Climate & Renewables UK Ltd, Mankiewicz, Muehlhan, CPT-UB

      STARTING DATE: 1st of June 2015

                                                     DURATION: 42 months

ABSTRACT

The main objective of Riblet4Wind is the transfer of a technology that has already demonstrated its capacity for increasing the energy efficiency in the aeronautics sector, to the wind energy industry. Application of functional riblet structure will improve the drag to lift ratio of rotor blades significantly.


Wind tunnel experiments have proven the capability of this riblet-coating technology to increase the efficiency of wind turbines by up to 6%.


This direct effect will allow gaining the same amount of electrical energy with smaller rotor blades. Indirect effects will increase the benefit to approximately more than 10%:

  • The improved drag to lift ratio will allow operation at lower wind speeds. The earlier cut-in of the WTG will improve the facility to balance in the electrical grid system.
  • The riblet structure improves the stall and turbulence behaviour of the rotor blades thus allowing also operation at higher wind speeds and/or operation in less optimum wind conditions, e.g. changing wind directions or gusts.
  • The improved drag to lift ratio will reveal design options due to changes of the design loads.
  • The riblet structure will also result in a substantial reduction of noise emissions.