Easy-to-manufacture, efficient riblet structure

Abstract

The invention relates to a riblet structure (1) comprising several spaced-apart, in particular wedge-shaped, longitudinal ribs (5) projecting from a base surface (6) and oriented in a principal direction (H), wherein two adjacent longitudinal ribs (5) form a longitudinal channel (2) oriented in the principal direction (H), the base surface (6) in each longitudinal channel (2) having a substructure (3) that is periodic in the principal direction (H). For simple manufacturing while maintaining favorable properties with respect to frictional resistance, the invention provides that the substructures (3) of adjacent longitudinal channels (2) are arranged with periodicities of the substructures (3) offset from each other in the principal direction (H), preferably by half a period, wherein the respective substructure (3) is formed with elevations (E) extending obliquely to the longitudinal ribs (5).