Abstract
UNAFLOW (UNsteady Aerodynamics for Floating Wind) is a joint EU-IRPWIND founded experiment on wind turbine rotor unsteady aerodynamics. It brings together four different academic contributors: Energy research Centre of the Netherlands (ECN), DTU Wind Energy, University of Stuttgart (USTUTT) and Politecnico di Milano (PoliMi) sharing knowledge both in numerical modelling and in experimental tests design, allowing direct numerical and experimental comparison.The experimental tests carried out for UNAFLOW are of the same type of the ones carried out during the ongoing EU H2020 project LIFES50+ [1], regarding both the unsteady behaviour of the 2d blade section and the entire turbine rotor, although with improved setup and wider test matrix.The project partners are already currently jointly collaborating in the AVATAR project [2], developing and validating numerical models of different accuracy level. The numerical models used in the UNALFOW project range from engineering tool (eg. BEM) to high fidelity CFD methods. Numerical simulations are used both in the design of experiment phase and in the results analysis allowing for an in depth understanding of the experimental findings through advanced modelling approach.The UNAFLOW project, together with a new understanding of the unsteady behaviour of the turbine rotor aerodynamics, will provide also an open database to be shared among the scientific community for future analysis and new models validation.
Highlights
UNAFLOW project focus is the advanced aerodynamic modelling and novel experimental approaches about unsteady behaviour of Multi-Megawatt wind turbines rotors
The project was focused in the analysis of simple conditions, the pitching oscillation effect on the blade airfoil aerodynamics and the surge motion on the full rotor response, on the other hand, a great number of different combinations of frequency and amplitude was taken into consideration
The most important outcome of the UNAFLOW project is the wide database of unsteady turbine aerodynamics in imposed motion conditions
Summary
- Numerical analysis of unsteady aerodynamics of floating offshore wind turbines M. - Experimental investigation of the unsteady aerodynamics of FOWT through PIV and hot-wire wake measurements I. - Control design methods for floating wind turbines for optimal disturbance rejection Frank Lemmer, David Schlipf and Po Wen Cheng
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