AEROACOUSTIC ROTOR BLADE FOR A WIND TURBINE, AND WIND TURBINE EQUIPPED THEREWITH

摘要

The invention concerns a rotor blade (6).and a wind turbine (1) with such arotor blade(6), wherein the absolute length L of the rotor blade (6) extends from thebladeattachment (11) to the blade tip (12) and the relative blade length x/Lproceeds from theblade attachment (11). The rotor blade (6) is divided into an innerlongitudinal section L;associated with the blade attachment (11) and an outer longitudinal section Laassociated with the blade tip (12), wherein the transition from the innerlongitudinalsection L i to the outer longitudinal section L a defines the cross-sectionalplane E o, andthe blade tip (12) defines the cross-sectional plane E E. As a function of therelativeblade length x/L, the rotor blade (6) has a specific aerodynamic profile witha chord t, atwist .theta., a relative thickness d/t, a relative curvature f/t, and arelative trailing edgethickness h/t. In order to reduce acoustic emissions without having to acceptappreciable losses in performance, it is proposed according to the inventionthat thecross-sectional plane E o is located at a relative blade length x/L in therange between0.80 and 0.98, the blade chord t of the aerodynamic profile in the cross-sectional planeE E is at least 60% of the blade chord t of the aerodynamic profile in thecross-sectionalplane E o, and the blade twist .theta. of the aerodynamic profile in the cross-sectional planeE E is greater than the blade twist .theta. of the aerodynamic profile in thecross-sectionalplane E o.