Aeroelastic Analysis of Pre-Curved Rotor Blades - (PPT)

摘要

The aeroelastic behaviour of pre-curved rotor blades is analysed by means of two different state-of-the-art aeroelastic tools. The first one is a second order accurate beam model based on the Euler-Bernoulli formulation by Hodges that is presently extended to account for the build-in curvature of a blade. The second is a multi-body model, in which the blade is divided in a number of interconnected sub-bodies, each one of them considered as linear Euler-Bernoulli beam. Blade curvature is analysed both in the direction of the wind (pre-bend), as well as in the rotational direction (sweep). Simulations are reported for various pre-curved blade geometries on the 5 MW Reference Wind Turbine of the UPWIND project. By comparing the results obtained from the two models, the limitations related to the various modelling assumptions are highlighted. Also, the blade loads for the various pre-curved blade geometries are compared to those of their straight counterpart. In this way advantages and disadvantages, in terms of loads and stability, of pre-curved blades in comparison to conventional straight blades are demonstrated.