Low NOx emission combustion liner with circumferentially angled film cooling holes
AssigneePower Systems Mfg., LLC
InventorsRobert J. Kraft, Vincent C. Martling, Brian R. Mack, Mark A. Minnich
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Abstract
An improved dual-stage, dual-mode turbine combustor capable of reducing nitric oxide (NOx) emissions is disclosed. This can-annular combustor utilizes multiple, single wall sheet metal combustor liners, generally annular in shape, and each liner having multiple hole film cooling means, which includes at least one pattern of small, closely spaced film cooling holes angled sharply in the downstream direction and various circumferential angles for improved liner cooling and improved fuel/air mixing within the liner, resulting in lower NOx emissions.
Claims6
An improved low emission combustor for use with a gas turbine engine comprising:
- a substantially cylindrical combustor liner comprising a premix chamber for mixing fuel and air, and a combustion chamber positioned downstream of said premix chamber and in communication therewith for the combustion of said fuel and air, said combustion liner premix chamber containing multiple rows of angled film cooling holes and multiple rows of dilution holes for the purpose of liner cooling and fuel to air mixing within said premix chamber, where cooling holes are angled towards said combustion chamber, cold side to hot side;
- a venturi containing a cooling channel containing at least one inlet and at least one exit aperture for cooling air, said cooling channel is configured to feed cooling air into said liner forward of said downstream combustion chamber and;
- a combustor dome cap assembly containing receptacles for multiple fuel nozzles and for regulating the amount of air introduced into the premix chamber, said dome cap assembly comprising:
- a circular dome plate with an array of apertures located around the center line of the combustor for the purpose of engaging fuel nozzles;
- said dome plate containing multiple rows of angled film cooling holes angled in a tangential direction cold side to hot side with the intent of imparting swirl into the air flow;
- a center hole in said dome plate with inner and outer co-axial, substantially cylindrical tubes extending through said center hole, each tube containing a co-axial tangential swirler for mixing fuel and air;
- multiple cylindrical nozzle tubes fixed to said dome plate at each of said apertures for engaging fuel nozzles, said multiple cylindrical nozzle tubes in a circular array about said inner and outer co-axial substantially cylindrical tubes;
- means for cooling said nozzle tubes;
- said outer co-axial substantially cylindrical tube contains multiple rows of angled film cooling holes that are angled in the axial direction, cold side to hot side.
Dependencies are inferred from the claim text.