(19)
(11) EP 0 849 529 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.06.1999 Bulletin 1999/23

(43) Date of publication A2:
24.06.1998 Bulletin 1998/26

(21) Application number: 97310463.1

(22) Date of filing: 22.12.1997
(51) International Patent Classification (IPC)6: F23C 7/00, F23D 17/00
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 20.12.1996 US 771408
20.12.1996 US 771409

(71) Applicant: UNITED TECHNOLOGIES CORPORATION
Hartford, Connecticut 06101 (US)

(72) Inventors:
  • Snyder, Timothy S.
    South windsor, Connecticut 06074 (US)
  • Sowa, William A.
    simsbury, Connecticut 06070 (US)
  • Kramer, Stephen K.
    Stuart, Florida 34997 (US)

(74) Representative: Leckey, David Herbert 
Frank B. Dehn & Co., European Patent Attorneys, 179 Queen Victoria Street
London EC4V 4EL
London EC4V 4EL (GB)

   


(54) Tangential entry fuel nozzle


(57) A method of reducing the tendency of the combustion flame to attach to the centerbody of a tangential entry nozzle 10 is disclosed which comprises mixing fuel and air in a mixing zone 28 within a fuel nozzle assembly, thereby producing a first fuel/air mixture, which is isolated from the combustion products by maintaining sufficiently high axial velocities throughout the mixing zone.
The nozzle has a longitudinal axis 26 and two cylindrical-arc scrolls 22,24 with the centerline of each offset from that of the other. Overlapping ends of these scrolls form an air inlet slot therebetween for the introduction of an air/fuel mixture into the fuel nozzle. A combustor-end endplate 18 has a central opening 20 to permit air and fuel to exit into a combustor, while at the opposite end another endplate 16 blocks the nozzle flow area. The scrolls are secured between these endplates. A centerbody 12 is located between the scrolls coaxial with the axis. The centerbody 12 has a base 58 which includes at least one air supply port extending therethrough, and an internal passageway 64. It includes a frustum portion (54) and aerodynamic ramps theat prevent flow reversal and flame stabilisation between the endplates 16,18.






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