Ring sector for use in ring of turbine in e.g. turbo-prop engine of airplane, has plate that is corrugated such that size of gap is increased and decreased successively, where perforations of plate are provided at level of gap

摘要

The sector (16) has a wall (15) defining an axially oriented aerodynamic vein in which gas is flown. A multi-perforated plate (11) is located opposite to the vein with respect to the wall. The plate comprises bottom (12) and sidewalls (13). A space between the wall and the bottom of the plate defines an air gap (E). The plate is corrugated such that size of the gap is increased and decreased successively along axial direction (X) and/or circumferential direction. Perforations (14) of the plate are provided at the level of the gap.