Diffuser, in particular for an axial flow machine

摘要

The invention concerns a diffuser (20), in particular for an axial flow machine, preferably a stationary gas turbine, which diffuser (20) transforms from a ring channel (17) with a first cross sectional area into an outlet space (21) with a second, larger cross sectional area along a machine axis (31). Improved efficiency is achieved in that the transition is effected in several steps (22a-c) and that an annular passage (29) is provided through which a gas flow is able to escape and to flow along the guiding surface (28) in the form of a Coanda flow (30).