Power plants – Combustion products used as motive fluid – Combustion products generator
Patent
1994-02-10
1995-04-25
Thorpe, Timothy S.
Power plants
Combustion products used as motive fluid
Combustion products generator
60742, 239422, 239601, F23R 336, F02C 722
Patent
active
054088305
ABSTRACT:
A fuel nozzle for gas turbine combustors reduces combustion instabilities by injecting purge air into the combustor angularly instead of axially. The fuel nozzle has a substantially cylindrical body with a number of internal passages. One of the passages provides premix gas fuel to a plurality of fuel injectors attached to the fuel nozzle. The remaining passages can be for diffusion gas, atomizing air and liquid fuel. One or more of the remaining passages is connected to a respective group of discharge orifices formed in the cylindrical side surface of the nozzle body. During low NO.sub.x operation, premix gas is introduced through the fuel injectors, and the remaining passages are all purged with air to prevent the ingress of flame gases from the combustion chamber. The resulting jets of air emitted from discharge orifices formed in the side surface will disrupt or break-up spanwise vortices shed from the bluff end of the fuel nozzle, thereby reducing combustion instabilities. These air jets are preferably discharged at an angle of about 45 degrees to the longitudinal axis of the fuel nozzle. The orifices can be rectangular, circular or triangular in shape.
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General Electric Company
Scanlon Patrick R.
Thorpe Timothy S.
Webb II Paul R.
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