Patent ID: 8607456
Filing Date: 2013-12-17
Classification: B21D,B23K,F15D,Y10T

Abstract:
1. A method for producing, on a wall surface capable of being swept by a fluid, disruptive raised elements in a boundary layer, comprising: identifying a desired transition zone on the wall surface between a laminar boundary layer and a turbulent boundary layer; 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; and varying heights of the peaks by applying at least some of the laser shocks such that the laser shocks overlap, wherein said overlap of the laser shocks results in a squashed peak on the border of the impact zones, wherein the height of the squashed peak is a function of an amount of the overlap between the laser shocks such that the height of the squashed peak decreases as the amount of the overlap between laser shocks increases, 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 the squashed peaks are applied in zones in which a slight roughness and laminar flow are desired; and wherein said impact zones present a round or elliptical shape.