Nozzle design to reduce fretting
AssigneePratt & Whitney Canada Corp.
InventorSaeid Oskooei
Life of this patent
Estimating the term…
Abstract
A method of designing a fuel nozzle of a gas turbine engine to reduce fretting thereof during use, including establishing an initial nozzle design, determining a first natural frequency of that design and a running frequency range of the gas turbine engine, and increasing a first transverse dimension of the stem member of the nozzle across a length of a portion thereof adjacent the inlet end until the first natural frequency of the nozzle is outside the running range, while a second transverse dimension of the portion remains at least substantially unchanged across the length thereof.
Claims8
A fuel nozzle for a gas turbine engine, the nozzle comprising a monolithic stem member having an inlet end with at least one inlet for connection to a fuel supply, an outlet end with at least one outlet for connection to a spray tip assembly, and a central portion extending between the inlet and outlet ends, the stem member having at least one fuel conduit extending therethrough in connection with the inlet end and the outlet end, the stem member having a longitudinal axis and first and second transverse axes defined at least substantially perpendicularly to the longitudinal axis, a first outer dimension of the central portion defined parallel to the first transverse axis increasing from a first point located between the inlet and outlet ends to a second point adjacent the inlet end, a second outer dimension of the central portion defined parallel to the second transverse axis remaining at least substantially constant between the first and second points.
Dependencies are inferred from the claim text.