Wind turbine rotor blade

A wind turbine rotor blade comprising a blade tip (10), a blade root (12), a leading edge (16), a trailing edge (18), a pressure side (32), a suction side (30) and a cross-section, which changes from the blade tip (10) to the blade root (12), wherein the cross-section in the middle (14) of the rotor blade is formed by an aerodynamic profile and is mainly circular at the blade root (12), and wherein the cross-section in a longitudinal portion of the rotor blade, the longitudinal portion being arranged between the blade root (12) and the middle (14) of the rotor blade, comprises:

• a convex pressure side portion (78), which extends from the leading edge (16) up to a pressure-side inflection point (80),
• a concave pressure side addition portion (82), which connects with the pressure-side inflection point (80) with a continuous curvature and extends up to the trailing edge (18),
• a convex suction side portion (72), which extends from the leading edge (16) up to a suction-side kink or inflection point (74),
• a suction side addition portion (76), which extends from the suction-side kink or inflection point (74) up to the trailing edge (18), and
• wherein the kink or inflection point (74) is formed such that if one follows a progression of a curve defined by the convex suction side portion (72) and the suction side addition portion (76) from the leading edge (16) up to the kink or inflection point (74), a direction of the curve changes at the kink or inflection point (74) towards an outside of the cross-section.