HOOD FOR NOZZLE gas turbine engine comprising triangular elements With double top to reduce noise JET nozzle gas turbine engines and gas turbine engines

摘要

1. An annular hood (14, 16) for the nozzle (10) of a gas turbine engine comprising a plurality of shaped elements (26) arranged in the continuation of the trailing edge (14a, 16a) of the cowl and spaced apart circumferentially, each shaped element (26) has a contour of substantially triangular shape with a base (28) formed part of the hood of the trailing edge, and two vertices (30, 31), each of which is spaced in the downstream base and connected to the hood side (32), characterized in that for each figure element (26), each vertex (30, 31) has A substantially curved path and connected to the other vertex, a substantially curved portion (34) with a radius of curvature (R1), greater than the radii of curvature (r1, r2) contour vertices (30, 31), each side (32) mates with the trailing edge (14a, 16a) of the hood (14, 16) in the direction substantially curved contour having a radius of curvature (R2), greater than the radii (r1, r2) of curvature of the vertices of the contour (30, 31) and greater than the radius of curvature (R1) curved contour portion (34) connecting said top; ivershiny (30, 31) and connecting them to a curved portion (34) are inclined radially inwardly of the hood (14, 16) towards its rear edge (14a, 16a) with a curved portion joining said apex which is offset radially outwards with respect to vershinam.2. Hood according to Claim. 1, wherein the vertices (30, 31) of each figure element (26) are substantially at the same height (L2) relative to the base (28) .3. Hood according to one of claims. 1 or 2, wherein at least one of the shaped elements (26) has symmetry relative to the center plane (S) element passing through the axis (X-X) of the hood of a circle (14) .4. The nozzle (10) gazotur