Patent ID: 8684665

Claim:
A turbine ring sector comprising: a wall presenting an inside face and an outside face, the inside face defining an axially oriented airflow passage through which gas flows; and a multiply-perforated metal sheet situated on a side of the wall that is opposite from the airflow passage, said multiply-perforated metal sheet having a bottom, wherein, in an axial cross section, the outside face of the wall is planar and the bottom of the multiply-perforated metal sheet presents an arcuate convex shape extending toward an axis of the turbine ring sector, wherein a minimum radial distance between the outside face of the wall and the bottom of the multiply-perforated metal sheet defines a gap, and wherein a variation in a value of the gap over an entire axial or circumferential extent thereof gradually decreases from a first maximum value at a first end of the multiply-perforated metal sheet towards a minimum value, said minimum value defining a minimum of the gap, and gradually increases from the minimum value to a second maximum value at a second end of the multiply-perforated metal sheet.