22 research outputs found
Fast Aeroelastic Analysis and Optimisation of Large Mixed Materials Wind Turbine Blades
In this dissertation, structural wind turbine blade layouts are presented that are suitable for 10MW and 20MW wind turbine blades. This has been accomplished by using a medium fidelity static aeroelastic model embedded in an optimisation framework. The structural solutions are the result of a stiffness optimisation where the blade mass is minimised. To accomplish the structurally optimised blade, an aeroelastic analysis model is set up. This model consists of a nonlinear structural analysis module and an aerodynamic module. Both models are comparable in terms of the level of physical modelling and as such, it can be said that both models are of equal fidelity. This equal fidelity is favourable for the aeroelastic coupling between both models, which generates an aeroelastic solution that is accurate up to the level of physics present in the aerodynamic and the structural models...Aerospace Structures & Computational Mechanic
Comparison of wake models with data for offshore wind farms
A major objective of the ENDOW project is to evaluate the performance of wake models in
offshore windfarm environments in order to ascertain the improvements required to
enhance the prediction of power output within large offshore wind farms [1]. The strategy for
achieving this is to compare the performance of the models in a wide range of conditions
which are expected to be encountered during turbine operation offshore. Six models of
varying complexity have been evaluated initially against the Vindeby single wake data in [2]
where it was found that almost all of them overestimate the wake effects and also significant
inconsistencies between the model predictions appeared in the near wake and turbulence
intensity results. Based on the conclusions of that study, the ENDOW wake modeling groups
have already implemented a number of modifications to their original models. In the present
paper, new single wake results are presented against experimental data at Vindeby and
Bockstigen wind farms. Clearly, some of the model discrepancies previously observed in
Vindeby cases have been smoothed and overall the performance is improved.
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