(19)
(11) EP 2 594 741 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.08.2017 Bulletin 2017/34

(43) Date of publication A2:
22.05.2013 Bulletin 2013/21

(21) Application number: 12191495.6

(22) Date of filing: 06.11.2012
(51) International Patent Classification (IPC): 
F01D 9/02(2006.01)
F01D 25/16(2006.01)
 F01D 9/04(2006.01)
F01D 1/02(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 17.11.2011 DE 102011118735

(71) Applicant: Ansaldo Energia Switzerland AG
5401 Baden (CH)

(72) Inventors:
  • Hofmann, Willy Heinz
    5406 Baden-Rütihof (CH)
  • Busekros, Armin
    8049 Zürich (CH)
  • Sommer, Thomas Peter
    4102 Binningen (CH)

(74) Representative: Bernotti, Andrea et al
Studio Torta S.p.A. Via Viotti, 9
10121 Torino
10121 Torino (IT)

   


(54) Diffuser, in particular for an axial flow machine


(57) 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).







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