Patent ID: 8127551

Claim:
A turbomachine comprising: an annular combustion chamber; a centrifugal compressor; an annular diffuser enabling the flow of gas leaving the compressor to be diffused and directing this flow of gas towards the combustion chamber, the diffuser comprising: an upstream portion oriented radially and presenting diffusion passages connected to the outlet from the compressor; an intermediate portion that is elbow-shaped; and a downstream portion having a series of circularly spaced-apart flow-straightening vanes; and an outer casing surrounding the outside of the combustion chamber and the downstream portion; wherein the flow stream in the downstream portion is delimited externally by the outer casing, the outer casing presenting a shoulder against which an outer downstream edge of the intermediate portion comes into abutment; wherein the flow-straightening vanes are not fastened to the outer casing; wherein, when cold there exists clearance between the flow-straightening vanes and the outer casing.