Combustor swirler with twisted vanes

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EP 0 902 237 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	20.09.2000 Bulletin 2000/38

(43)	Date of publication A2:
	17.03.1999 Bulletin 1999/11

(21)	Application number: 98116591.3

(22)	Date of filing: 02.09.1998

(51)	International Patent Classification (IPC)⁷: F23R 3/14

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

10.09.1997 JP 24547797

(71)	Applicant: Mitsubishi Heavy Industries, Ltd.
	Tokyo 100-0005 (JP)

(72)	Inventors:
	Mandai, Shigemi, c/o Takasago R & D Center Arai-cho, Takasago-shi, Hyogo-ken (JP) Ohta, Masataka, c/o Takasago R & D Center Arai-cho, Takasago-shi, Hyogo-ken (JP) Inada, Mitsuru, c/o Takasago Machinery Works Arai-cho, Takasago-shi, Hyogo-ken (JP) Akamatsu, Shinji, c/o Takasago Machinery Works Arai-cho, Takasago-shi, Hyogo-ken (JP)

(74)	Representative: Henkel, Feiler, Hänzel
	Möhlstrasse 37 81675 München 81675 München (DE)

(54)	Combustor swirler with twisted vanes

(57) Pre-mixture forming swirler in gas turbine pre-mixed flame type low NO_x combustor is improved so as to accelerate mixing of fuel and air and to prevent occurrence of flame stagnation and burning of component.
Three-dimensional swirler is constructed such that swirler vane (101a) is twisted from hub side thereof to tip side so that fitting angle (β) of the tip side relative to fuel nozzle (102) center axis (C) is larger than that (α) of the hub side. Thereby, while the angle (α) of the hub side is set smaller so that flame stagnation and burning of components resulted therefrom may be prevented from occurring, the angle (β) of the tip side may be selected so that shearing flow necessary for appropriate mixing of fuel (F) and air (A) is obtained, thus favorable pre-mixing is done, life deterioration due to the burning etc. is prevented and combustion efficiency is enhanced.

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