DEVICE FOR MOUNTING AN AIR-FLOW DIVIDING WALL IN A TURBOJET ENGINE AFTERBURNER

Abstract

Device for mounting a dividing wall (112) for separating the main air stream and the bypass air in a bypass turbojet engine afterburner, comprising means of attaching the upstream end of this wall to a guide vane casing and means (150) for supporting the downstream end of this wall, these means being provided on flame holder arms (130) of the afterburner radially on the inside of the dividing wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood and other details, characteristics and advantages thereof will become apparent from reading the following description given by way of nonlimiting example and with reference to the attached drawings in which:

FIG. 1 is a schematic half view in axial section of a bypass turbojet engine afterburner;

FIG. 2 is a schematic perspective view of a dividing wall according to the prior art;

FIG. 3 is a schematic perspective view of a dividing wall according to the invention;

FIG. 4 is a schematic front view of a flame holder arm according to the invention, viewed from the downstream end;

FIGS. 5 to 7 are partial schematic perspective views of the device according to the invention.

Claims

1. An afterburner for a bypass turbojet engine, comprising a substantially cylindrical dividing wall separating the main air stream from the bypass air, means of attaching the upstream end of this wall to an external casing, and means for supporting the downstream end of this wall, these support means being provided on flame holder arms extending radially with respect to the axis of the afterburner, wherein the dividing wall comprises orifices or notches through which the flame holder arms pass, each comprising a substantially radial flange extending inside the dividing wall and forming a surface for supporting the edge of a corresponding orifice or notch in the dividing wall, and a cylindrical rim substantially coaxial with the arm is formed on the flange and extends radially outward in the orifice or the notch in the dividing wall and along the edge of the orifice or of the notch.

2. The afterburner as claimed in claim 1, wherein the cylindrical rim formed on the flange is tall enough to prevent hot gases from the main air stream from entering means of ventilation of the flame holder arm.

3. The afterburner as claimed in claim 1 or 2, wherein the cylindrical rim extends along the upstream edge of the flange and along at least part of the downstream edge of the flange.

4. The afterburner as claimed in one of claims 1 to 3, wherein the flange is formed as a single piece with the flame holder arm or is attached to the flame holder arm.

5. The afterburner as claimed in one of claims 1 to 4, wherein the cylindrical rim is attached to lateral lugs used for fixing the flame holder arm to the casing.

6. The afterburner as claimed in one of claims 1 to 5, wherein the part of the arm that extends radially inside the flange has an aerodynamic profile to guarantee that the gas flow around the arm is clean and stable.

7. The afterburner as claimed in one of the preceding claims, wherein the downstream end of the dividing wall extends inside a cylindrical sleeve that provides thermal protection to an afterburner jetpipe and comprises means for bearing radially against this sleeve.

8. The afterburner as claimed in claim 7, wherein the radial-bearing means are formed of small bridges attached to the downstream end of the dividing wall.

9. The afterburner as claimed in claim 1, and which involves annular afterburning, wherein the dividing wall is supported by small bridges attached to the trailing edges of the flame holder rings.

10. A bypass turbojet engine which comprises an afterburner as claimed in one of the preceding claims.

11. A flame holder arm for an afterburner as claimed in one of claims 1 to 9, comprising, at one end, fixing lugs and which comprises, at the base of these lugs, a substantially radial external flange formed with a cylindrical rim attached to the fixing lugs.

12. The flame holder arm as claimed in claim 11, wherein the flange is formed as one piece with the arm or is attached thereto.