Wind turbine blade with narrow shoulder and relatively thick airfoil profiles

A blade (10) for a rotor of a wind turbine (2) having a substantially horizontal rotor shaft, said rotor comprising a hub (8), from which the blade (10) extends substantially in a radial direction when mounted to the hub (8), the blade having a longitudinal direction (r) with a tip end (16) and a root end (14) and a transverse direction, the blade further comprising:

• a profiled contour including a pressure side and a suction side, as well as a leading edge (18) and a trailing edge (20) with a chord having a chord length (c) extending there between, the profiled contour, when being impacted by an incident airflow, generating a lift, wherein the profiled contour is divided into:
• a root region (30) having a substantially circular or elliptical profile closest to the hub,
• an airfoil region (34) having a lift-generating profile furthest away from the hub, and
• a transition region (32) between the root region (30) and the airfoil region (34), the transition region (32) having a profile gradually changing in the radial direction from the circular or elliptical profile of the root region to the lift-generating profile of the airfoil region, and with
• a shoulder (40) having a shoulder width (W) and located at the boundary between the transition region (32) and the airfoil region (34), wherein
• the blade (10) has a blade length (L), and
• the profiled contour comprises a local relative thickness defined as the local ratio between a maximum profile thickness (t) and the chord length (c), wherein
• the ratio between the shoulder width (W) and the blade length (L) being less than or equal to 0.075, and
• the relative thickness (t/c) in a blade length interval of 0-0.8 L is at least 22%.