Patent ID: 7950902

Claim:
A wall element in which at least one cooling channel is formed, said wall element comprising: an inside surface and an outside surface cooled by cool air flowing along said channel, wherein the channel includes a hole and a diffusion portion, the hole opening out at one end thereof in the inside surface, and at an other end in the diffusion portion where the hole forms an orifice, the diffusion portion flaring around said orifice and opening out in the outside surface, wherein a front end of a bottom of the diffusion portion is substantially planar, slopes in a thickness of the wall, extends forwards from the orifice in a cool air flow direction, wherein the diffusion portion includes a margin extending behind the orifice, along sides of the diffusion portion, and in front of the orifice, said margin joining the sides of the front end of the bottom of the diffusion portion, and wherein the margin and the front end of the bottom of the diffusion portion are inscribed in a cone having a rounded end and a conical surface that includes a flat portion.