Turbine engine casing

1. A turbine engine casing comprising:

a cylindrical wall extending along a longitudinal axis; and

a single-piece annular panel for acoustic insulation mounted radially inside the wall and extending along a longitudinal axis so as to be coaxial relative to the wall, the panel including a radially outer annular surface fitted with upstream and downstream first projecting members respectively arranged in upstream and downstream portions of the radially outer annular surface of the panel, the wall including a radially inner annular surface fitted with upstream and downstream second projecting members that are releasably fastened respectively to the upstream and downstream first projecting members,

wherein each of the upstream or downstream first projecting members, or the upstream or downstream second projecting members comprises a first portion fastened to the panel or to the wall, respectively, and a second portion fastened to the corresponding opposite projecting member, the first portion being slidable relative to the second portion along the longitudinal axis of the panel and the longitudinal axis of the wall when fastened.

2. A casing according to claim 1 , wherein each projecting member includes a radially extending portion coming to bear against the radial portion of the opposite projecting member, said radial portions of the opposite projecting members being fastened to each other in releasable manner.

3. A casing according to claim 2 , wherein the opposite projecting members are fastened together by a nut-and-bolt assemblies, each nut-and-bolt assembly comprising a bolt and a floating nut crimped to one of the radial portions of the opposite projecting members.

4. A casing according to claim 1 , wherein the first projecting members are received at least in part in setbacks of the panel.

5. A casing according to claim 1 , wherein each of at least two projecting members includes a centering peg for engaging in a calibrated hole of the opposite projecting member.

6. A casing according to claim 5 , wherein the upstream first projecting members or the upstream second projecting members comprise two portions that are slidable relative to each other, at least two downstream first projecting members or at least two downstream second projecting members each including a centering peg, or the downstream first projecting members or the downstream second projecting members comprise two portions that are slidable relative to each other, and at least two upstream first projecting members or at least two downstream second projecting members each include a centering peg.

7. A casing according to claim 1 , wherein the first portion includes a base fastened to the panel or to the wall, with two side branches projecting therefrom, two opposite rims extending towards each other from the ends of the branches that are remote from the base, the second portion being formed by an axial portion slidably engaged in the space defined between the base, the side branches, and the rims of the first portion.

8. A casing according to claim 1 , wherein the upstream projecting members and the downstream projecting members are offset angularly from one another in a radial plane.

9. A turbine engine such as an airplane turboprop or turbojet including a casing according to claim 1 .

10. A casing according to claim 7 , wherein the axial portion of the second portion is planar, and the second portion includes a radial portion extending radially from a free end of the axial portion of the second portion.