Reducing noise from a combustor of a gas turbine engine
AssigneeRaytheon Technologies Corporation
InventorsJustin M. Locke, Dennis Moura, Duane McCormick, Scott A. Liljenberg, Theodore Strickland, William Proscia
Life of this patent
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Abstract
A method of reducing noise from a combustor of a gas turbine engine includes the steps of establishing a maximum noise limit that may be for a particular frequency range. A primary fuel flow percentage, which may be emitted from a fuel nozzle arrangement having various groupings of simplex and duplex nozzles, is then established. An immersion depth measured between an aft rim of a swirler and a distal tip of the fuel nozzles may then be reduced thereby reducing the noise amplitude.
Claims19
A combustor comprising a plurality of swirlers that are circumferentially spaced from one another and a corresponding plurality of fuel nozzles such that each swirler of the plurality of swirlers is axially aligned with a different fuel nozzle of the plurality of fuel nozzles, the plurality of fuel nozzles comprising a plurality of duplex fuel nozzles and a plurality of simplex fuel nozzles, the duplex fuel nozzles being structurally different from the simplex fuel nozzles, each fuel nozzle of the plurality of fuel nozzles comprising:
- a distal tip,
- wherein the distal tip comprises:
- a tubular portion;
- a distal portion;
- and
- a conical portion concentrically orientated and axially disposed between the tubular portion and the distal portion;
- a plurality of fuel spray apertures circumferentially spaced from one another and communicating through the conical portion and configured to produce a fuel spray into a combustion chamber,
- the distal portion projecting in a direction of and being recessed from a downstream rim of the plurality of swirlers corresponding with the plurality of fuel nozzles,
- an immersion depth measured between the distal portion of the distal tip and the downstream rim,
- wherein the immersion depth comprises less than 0.500 inches, wherein the combustor comprises four nozzle groupings that are circumferentially disposed relative to an axis of the combustor, wherein a first nozzle grouping of the nozzle groupings and a third nozzle grouping of the nozzle groupings each comprise six of the plurality of duplex fuel nozzles, wherein a second nozzle grouping of the nozzle groupings and a fourth nozzle grouping of the nozzle groupings each comprise three of the plurality of simplex fuel nozzles, and that are circumferentially located between the first nozzle grouping and the third nozzle grouping.
A combustor comprising a plurality of fuel nozzles comprising a distal tip,
- wherein the distal tip comprises:
- a tubular portion;
- a distal portion;
- and
- a conical portion concentrically orientated and axially disposed between the tubular portion and the distal portion;
- a plurality of fuel spray apertures spaced from one another and communicating through the conical portion and configured to produce a fuel spray into a combustion chamber of the combustor,
- an immersion depth measured between the distal portion of the distal tip and a downstream rim of a corresponding swirler of the combustor, the distal portion projecting in a direction of and being recessed from a downstream rim of the corresponding swirler,
- wherein the immersion depth is no more than about 0.500 inches,
- wherein the combustor comprises a first nozzle grouping, a second nozzle grouping, a third nozzle grouping, and a fourth nozzle grouping, wherein the first nozzle grouping and the third nozzle grouping each include a common first number of a plurality of duplex nozzles of the plurality of plurality of fuel nozzles, wherein the second nozzle grouping and the fourth nozzle grouping each include a common second number of a plurality of simplex nozzles of the plurality of fuel nozzles, wherein the plurality of simplex nozzles are structurally different from the plurality of duplex nozzles, and wherein the first number is of a different magnitude than the second number.
Dependencies are inferred from the claim text.