Patent ID: 8256116

Claim:
A method for producing, on a wall surface capable of being swept by a fluid, raised elements forming disrupters of the boundary layer, comprising: identifying a desired transition zone on the wall surface between a laminar boundary layer and a turbulent boundary layer; and applying laser shocks to the transition zone on said surface so as to create peaks on a border of impact zones of said laser shocks, wherein the wall is of a turbomachine blade, wherein the peaks constitute said disruptive raised elements, wherein intensity of turbulence in the transition zone is controlled based on at least one of shape of the impacts, height of the peaks, or distance between laser shocks, wherein said impact zones of said laser shocks present a rectangular shape which are aligned along a chord of the blade and aligned parallel to an axis of the blade, wherein the plurality of impacts present longitudinal peak lines which are parallel to the axis of the blade and transverse peak lines which are parallel to the chord of the blade, and wherein a height of the transverse peak lines is less than a height of the longitudinal peak lines.