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US 10,094,564 B2Granted
Combustor dilution hole cooling system
AssigneePratt & Whitney Canada Corp.
InventorLarry Lebel
Life of this patent
Estimating the term…
Abstract
A combustor for a gas turbine engine including a combustor shell, a heat shield mounted to the combustor shell spaced-apart from the combustor shell to define an air gap therebetween, a core dilution passageway extending through the combustor shell and the heat shield, and a sub-chamber disposed within the air gap in fluid communication with the core dilution passageway. The sub-chamber is separated from a remainder of the air gap by at least one intermediate rail projecting across the air gap and forming an outer boundary of a peripheral area of the core dilution passageway. Impingement holes are formed through the combustor shell and in fluid communication with the sub-chamber. A method of cooling an area surrounding a dilution hole in a combustor is also presented.
Claims17
A combustor for a gas turbine engine, comprising:
- a combustor shell which includes a protuberance away from an inner heat shield, the protuberance having a first dilution hole defined therein;
- the heat shield mounted to the combustor shell and spaced-apart from the combustor shell to define an air gap therebetween, the heat shield has an outer surface facing the combustor shell and circumferentially surrounding a combustion zone relative to a central axis of the combustor, and an opposite inner surface facing the combustion zone, the heat shield having a second dilution hole defined therein, the second dilution hole is axially and circumferentially aligned with the first dilution hole relative to the central axis, a diameter of the first dilution hole being smaller than a diameter of the second dilution hole, a boss encompassing the second dilution hole and extending from the outer surface of the heat shield to an outer end spaced from the heat shield;
- a core dilution passageway extending through the first dilution hole of the combustor shell and the second dilution hole of the heat shield;
- a sub-chamber disposed within the air gap in fluid communication with the core dilution passageway, the sub-chamber being separated from a remainder of the air gap by at least one intermediate rail projecting across the air gap and forming an outer boundary of the sub-chamber and of a peripheral area of the core dilution passageway, the boss forming an inner boundary of the of the sub-chamber;
- an annular peripheral dilution passageway defined between the combustor shell and the heat shield around the core dilution passageway and extending through the second dilution hole of the heat shield, the sub-chamber having an outlet between the outer end of the boss and the combustor shell protuberance which is upstream of an exit of the second dilution hole relative to a core dilution flow within the core dilution passageway such that a peripheral dilution flow exiting the sub-chamber outlet combines with the core dilution flow of the core dilution passageway to form a total dilution flow upstream of the exit of the second dilution hole relative to the core dilution flow within the core dilution passageway;
- and
- impingement holes formed through the combustor shell and in fluid communication with the sub-chamber and the remainder of the air gap, the impingement holes having at least an impingement jet path directed onto the outer surface of the heat shield within the sub-chamber.
4 more elements
A gas turbine engine, comprising:
- a combustor including:
- a combustor shell which includes a protuberance away from an inner heat shield, the protuberance having a first dilution hole defined therein;
- the heat shield mounted to the combustor shell and spaced-apart from the combustor shell to define an air gap therebetween, the heat shield has an outer surface facing the combustor shell and circumferentially surrounding a combustion zone relative to a central axis of the combustor, and an opposite inner surface facing the combustion zone, the heat shield having a second dilution hole defined therein, the second dilution hole is axially and circumferentially aligned with the first dilution hole relative to the central axis, a diameter of the first dilution hole being smaller than a diameter of the second dilution hole, a boss encompassing the second dilution hole and extending from the outer surface of the heat shield to an outer end spaced from the heat shield;
- a core dilution passageway extending through the first dilution hole of the combustor shell and the second dilution hole of the heat shield;
- a sub-chamber disposed within the air gap in fluid communication with the core dilution passageway, the sub-chamber being separated from a remainder of the air gap by at least one intermediate rail projecting across the air gap and forming an outer boundary of the sub-chamber and of a peripheral area of the core dilution passageway, the boss forming an inner boundary of the of the sub-chamber;
- an annular peripheral dilution passageway defined between the combustor shell and the heat shield around the core dilution passageway and extending through the second dilution hole of the heat shield, the sub-chamber having an outlet between the outer end of the boss and the combustor shell protuberance which is upstream of an exit of the second dilution hole relative to a core dilution flow within the core dilution passageway such that a peripheral dilution flow exiting the sub-chamber outlet combines with the core dilution flow of the core dilution passageway to form a total dilution flow upstream of the exit of the second dilution hole relative to the core dilution flow within the core dilution passageway;
- and
- impingement holes formed through the combustor shell and in fluid communication with the sub-chamber and the remainder of the air gap, the impingement holes having at least an impingement jet path directed onto the outer surface of the heat shield within the sub-chamber.
5 more elements
Dependencies are inferred from the claim text.