Serrated trailing edge panel for a wind turbine blade

A serrated panel (70) for a wind turbine blade, wherein the panel (70) is configured to be attached to the trailing edge of a blade to form a plurality of serrations (71) at the trailing edge of the blade, wherein the serrated panel comprises:

• a base part (72) for attaching the panel (70) to the trailing edge of the blade, the base part (72) having
• a first longitudinal end (73) for arrangement nearest a tip end of the wind turbine blade,
• a second longitudinal end (74) for arrangement nearest a root end of the wind turbine blade,
• a first side (75) for arrangement nearest a leading edge of the blade,
• a second side (76) for arrangement farthest from the leading edge of the blade,
• an attachment surface (77) for attaching to an exterior surface of the wind turbine blade, and
• an exterior surface (78) facing away from the exterior surface of the wind turbine blade, when the serrated panel (70) is attached to the wind turbine blade, and
• a plurality of serrations (71) extending from the second side (76) of the base part (72), wherein the serrations (71) comprise a base (79) proximal to second side (76) of the base part, and an apex (80) distal to the second side (76) of the base part (72) with a notional line (81) extending from a midpoint of the base (79) to the apex (80), characterised in that
• the serrations comprises a shape and are mutually spaced so that a slit is formed between adjacent serrations, wherein each of the slits (85) comprises a first side wall (86) at a first adjacent serration and a second side wall (87) at a second adjacent serration and a connecting surface (88) extending between the first side wall (86) and the second side wall (87), wherein the connecting surface (88) is substantially
• flat or flattened and comprises a first rounded surface (89) at the first sidewall (86) and a second rounded surface (90) at the second side wall (87).