Aeroelastic design and LPV modelling of an experimental wind turbine blade equipped with free-floating flaps
ST Navalkar (TU Delft - Team Raf Van de Plas)
L.O. Bernhammer (TU Delft - Wind Energy)
Jurij Sodja (TU Delft - Aerospace Structures & Computational Mechanics)
C.J. Slinkman (TU Delft - Support Delft Center for Systems and Control)
Jan Willem van Wingerden (TU Delft - Team Raf Van de Plas)
G.A.M. Van Kuik (TU Delft - Wind Energy)
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Abstract
Trailing edge aps located outboard on wind turbine blades have recently shown considerable potential in the alleviation of turbine lifetime dynamic loads. The concept of the free-oating ap is speci_cally interesting for wind turbines, on account of its modularity and enhanced control authority. Such a ap is free to rotate about its axis; camberline control of the free-oating ap allows for aeroelastic control of blade loads. This paper describes the design of a scaled wind turbine blade instrumented with free-oating aps, intended for use in wind tunnel experiments. The nature of the ap introduces a coupled form of utter due to the aeroelastic coupling of ap rigid-body and blade out-of-plane modes; for maximal control authority it is desired to operate close to the utter limit. Analytical and numerical methods are used to perform a utter analysis of the turbine blade. It is shown that the potential ow aeroelastic model can be recast as a continuous-time Linear-Parameter-Varying (LPV) state space model of a low order, for which formal controller design methodologies are readily available.
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