IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0302229
(2002-11-22)
|
발명자
/ 주소 |
- Martling, Vincent C.
- Xiao, Zhenhua
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
4 |
초록
▼
A method for providing cooling air to the venturi and the combustion chamber in a low NOx emission combustor as used in a gas turbine engine that includes the steps of providing an annular air passage surrounding said combustion chamber and venturi where said cooling air under pressure enters the co
A method for providing cooling air to the venturi and the combustion chamber in a low NOx emission combustor as used in a gas turbine engine that includes the steps of providing an annular air passage surrounding said combustion chamber and venturi where said cooling air under pressure enters the combustion chamber/venturi near the aft portion of the combustion chamber, passing the air along the combustion chamber, past the venturi where the air exits near the front portion of the convergent area of the venturi. The method prevents any channel/passage cooling air from being received into the combustion chamber, and at the same time, introduces the outlet of the cooling air, after the air has passed over the combustion chamber of the venturi and has been heated, back into the premix chamber thereby improving the efficiency of the combustor while reducing and lowering NOx emission in the combustion process. In an alternate embodiment, a combustion system is disclosed incorporating a shaped deflector to direct cooling air into a cooling passageway of a venturi. The deflector is configured to provide a cooling system with increased total pressure to increase overall cooling effectiveness.
대표청구항
▼
1. An improved low emission (NOx) combustor for use with gas turbine engine comprising:a liner having a first generally annular wall with an outer surface and including a premix chamber for mixing fuel and air and a combustion chamber for combusting said fuel and air, said premix chamber in communic
1. An improved low emission (NOx) combustor for use with gas turbine engine comprising:a liner having a first generally annular wall with an outer surface and including a premix chamber for mixing fuel and air and a combustion chamber for combusting said fuel and air, said premix chamber in communication with said combustion chamber, said first generally annular wall having at least one first aperture and at least one second aperture, said second aperture being radially outward of said premix chamber, and a deflector fixed to said outer surface of said first generally annular wall proximate said at least one first aperture, said deflector comprising:a generally annular ring having a forward end, an aft end in spaced relation to said forward end thereby defining a first length therebetween, an inner ring surface, an outer ring surface radially outward from said inner ring surface thereby defining a first height, a forward face, an aft face, each of said faces extending from said inner ring surface to said outer ring surface, said forward face in spaced relation to said aft face, said aft face having a first region of curvature with a first radius R 1 ;a venturi having a second generally annular wall that includes a first converging wall and a first diverging wall, said first converging wall abutting said first diverging wall at a first plane, said first plane generally perpendicular to said first generally annular wall, said venturi further containing a throat portion at said first plane, said throat portion being positioned between said premix chamber and said combustion chamber, said second generally annular wall being radially inward from said first generally annular wall and having an aft end adjacent said at least one first aperture, said venturi having a third generally annular wall being radially outward of said second generally annular wall and radially inward of said first generally annular wall, said third generally annular wall including a second converging wall and a second diverging wall, said second converging wall connected to said second diverging wall at a second region of curvature proximate said first plane and having a second radius R 2 ;a passageway for flowing cooling air through said venturi, said passageway extending from said at least one first aperture to said at least one second aperture, said passageway including a first portion radially inward from said third generally annular wall and radially outward from said second generally annular wall, and said passageway including a second portion radially outward from said first portion of said passageway, said second portion extending from said passageway first portion to said at least one second aperture, and said first aperture being radially outward from said first portion, and said first portion of said passageway having a third region of curvature with radius R 3 proximate said throat; and,a blocking ring extending from said aft end of said second generally annular wall to said first generally annular wall in sealing contact therewith, said blocking ring preventing cooling air that is in said first portion of said passageway from flowing directly into said combustion chamber without flowing through said second portion of said passageway;wherein said aft face of said deflector directs cooling air into said passageway through said at least one first aperture and said passageway communicates with said premix chamber through said at least one second aperture, such that cooling air, after being heated by cooling said venturi, exits from said passageway into the premix chamber thereby increasing the efficiency of the combustion process and reducing NOx emissions. 2. The low emission combustor of claim 1 wherein said first length of said deflector is at least 0.100 inches. 3. The low emission combustor of claim 1 wherein said first height of said deflector is at least 0.100 inches. 4. The low emission combustor of claim 1 wherein said forward face of said deflector further comprises a first member generally perpendicular to said inner ring surface and a second member extending from said first member to said outer ring surface and oriented at a pitch angle a relative to said outer ring surface. 5. The low emission combustor of claim 4 wherein said pitch angle a of said second member relative to said outer ring surface is at least 5 degrees. 6. The low emission combustor of claim 1 wherein said first radius R 1 is at least 0.250 inches. 7. The low emission combustor of claim 1 wherein said deflector is fixed to said outer surface of said first generally annular wall by a means such as brazing. 8. The low emission combustor of claim 1 wherein said deflector is fixed to said outer surface of said first generally annular wall by a means such as welding. 9. The low emission combustor of claim 1 wherein said second radius R 2 is less than said third radius R 3 . 10. The low emission combustor of claim 9 wherein said third radius R 3 is at least 0.150 inches. 11. The low emission (NOx) combustor of claim 1 further including a substantially annular bellyband wall radially outward from the first generally annular wall, and at least one third aperture in said first generally annular wall, said first portion of said passageway communicating with said second portion of said passageway through said third aperture, wherein said bellyband wall defines a radially outer boundary of the second portion of the passageway. 12. The low emission (NOx) combustor as in claim 11 wherein said at least one first aperture comprises a plurality of first apertures spaced circumferentially about the first generally annular wall, and each of said first apertures is radially outward of the first portion of the passageway. 13. The low NOx emission combustor of claim 12 wherein said at least one second aperture comprises a plurality of second apertures spaced circumferentially about the first generally annular wall, and each of said second apertures is radially outward of the premix chamber. 14. The low NOx emission combustor as in claim 13 wherein said at least one third aperture comprises a plurality of third apertures spaced circumferentially about the first generally annular wall, and each of said third apertures is radially outward of the venturi.
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