CENTRAL BODY OF A TURBOJET NOZZLE

Abstract

The invention relates to a central body of a turbojet nozzle comprising a wall forming a cavity. The central body comprises a plurality of orifices pierced over at least one upstream portion of its wall and a single resonance cavity forming a Helmholtz resonator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood with the aid of the following description of two preferred embodiments of the invention, with reference to the single appended FIGURE which represents a schematic view in section of a turbojet with the central body of the invention divided into two parts along a plane of symmetry, perpendicular to the sectional plane and passing through the axis of the turbojet, the top portion representing a first embodiment of the central body of the invention and the bottom portion a second embodiment of the central body of the invention.

In its top portion, the FIGURE shows a first embodiment, in its bottom portion, a second embodiment, in a symmetrical manner relative to a plane perpendicular to the sectional plane and passing through the axis A of the turbojet. The elements common to the two embodiments will be indicated by identical reference numbers.

Claims

1. A central body of a turbojet nozzle comprising a wall forming a cavity, which comprises a plurality of orifices pierced over at least one upstream portion of its wall and a single resonance cavity forming a Helmholtz resonator.

2. The central body as claimed in claim 1, which comprises an inner wall, not pierced, inside the wall forming the cavity, delimiting an outer cavity, forming said single resonance cavity, and an inner cavity.

3. The central body as claimed in claim 2, wherein the inner cavity is arranged to fulfill a function of guidance of the vapor relief stream, for a turbojet comprising a deaerator.

4. The central body as claimed in one of claims 2 and 3, wherein a seal is provided between the inner wall and the wall forming the cavity, in order to take up the expansion differentials.

5. The central body as claimed in one of the preceding claims, wherein the wall forming the cavity is a wall of revolution.

6. The central body as claimed in one of the preceding claims, which comprises at least one stiffener means making it possible to improve its mechanical strength.

7. The central body as claimed in one of the preceding claims, wherein the wall forming the cavity is a metal wall.

8. The central body as claimed in claim 7, wherein the metal wall is of constant thickness.

9. A turbojet comprising a nozzle with a central body as claimed in one of claims 1 to 8.