Fuel injectors
AssigneeROLLS-ROYCE plc
InventorsEric Hughes, Denis R. Carlisle, Neville R. Holmes
Life of this patent
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Abstract
A dual fuel injector for a gas turbine engine having means for water injection to reduce NOx emissions, comprises an outer annular gas fuel duct with a venturi section with air purge holes to prevent liquid fuel entering the gas duct, an inner annular liquid fuel duct having inlets for water and liquid fuel and through which compressor air flows, the inner annular duct terminating in a nozzle, and a central flow passage through which compressor air also flows, terminating in a main diffuser having an inner secondary diffuser. The surfaces of both diffusers are arranged so that their surfaces are washed by the compressor air to reduce or prevent the acretion of carbon to the injector, the diffusers in effect forming a hollow pintle.
Claims10
A gas turbine fuel injector comprising:
- a first body including liquid fuel duct means and gaseous fuel duct means;
- a hollow second body positioned within said first body, said first and second bodies defining therebetween a first annular flow passage for throughflow of compressed air, said first annular flow passage being in communication with said liquid fuel duct means, and said first annular flow passage terminating in a downstream end portion for accelerating flow of fluid therein and therefrom;
- said hollow second body defining a central second flow passage for the throughflow of only compressed air, said hollow second body having a downstream end defining a main diffuser;
- and
- flow directing means in said second flow passage of said hollow second body for directing flow of compressed air onto the interior surface of said main diffuser to wash the same and decrease carbon buildup thereon.
A gas turbine engine fuel injector comprising:
- a central flow passage terminating at its downstream end in a main diffuser, said central flow passage being only for throughflow of compressed air;
- an outer annular flow passage surrounding said central flow passage for throughflow of compressed air and/or liquid fuel, said outer annular flow passage having a downstream end portion terminating in an annular nozzle, said downstream end portion defining a venturi for accelerating the throughflow of fluid through the outer annular flow passage and annular nozzle;
- a further annular flow passage surrounding said outer annular flow passage, said further annular flow passage being for throughflow of gaseous fuel and including a portion of reduced cross-sectional area;
- purge air inlets communicating with said portion of reduced cross-sectional area of said further annular flow passage;
- and
- flow directing means in said central flow passage for directing compressed air over the interior of said main diffuser to wash the same and reduce carbon buildup thereon.
Dependencies are inferred from the claim text.