Internal cooling of engine components
First Claim
1. A nozzle guide vane or turbine blade of a gas turbine engine, the nozzle guide vane or turbine blade comprising:
- at least one internal cooling chamber for passage of cooling air, the at least one cooling chamber including;
(i) a leading edge portion, and (ii) at least one inlet portion through which cooling air enters the at least one cooling chamber from a feed source; and
a partitioning element disposed in the at least one inlet portion of the at least one cooling chamber and extending into the at least one cooling chamber to define a sub-chamber wholly or partly within the at least one cooling chamber, the partitioning element and the leading edge portion constitute boundaries of the sub-chamber, the sub-chamber having an inlet configured to receive cooling air from the feed source, the partitioning element including;
an axially outer portion, relative to a longitudinal axis of the at least one cooling chamber, extending into an inlet feed passage through which cooling air enters the at least one inlet portion of the at least one cooling chamber from the feed source; and
an end portion distal to the inlet feed passage in the at least one cooling chamber bending towards the leading edge portion of the at least one cooling chamber at a short axial distance from the inlet feed passage, such that the partitioning element reduces a cooling air velocity in the sub-chamber to a value smaller than a cooling air velocity in a remainder of the at least one inlet portion of the at least one cooling chamber.
1 Assignment
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Accused Products
Abstract
A gas turbine engine component, especially an aerofoil-sectioned nozzle guide vane (NGV), having at least one internal cooling chamber for passage of cooling air, the chamber including leading edge portion and one inlet portion via which cooling air may enter the chamber from feed source, wherein the component includes a partitioning element, e.g. curved or scoop-shaped partitioning plate or wall, provided in the chamber inlet portion and defining within the inlet portion a sub-chamber adjacent the leading edge portion, and wherein partitioning element is configured so the cooling air velocity in the sub-chamber is less than the cooling air velocity in the remainder of inlet portion. The reduced velocity of the cooling air in the sub-chamber adjacent the leading edge serves to increase pressure therein, thereby maintaining desired backflow pressure margin between the feed pressure of the cooling air delivered to the showerhead holes and the gas-path from the combustor.
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Citations
16 Claims
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1. A nozzle guide vane or turbine blade of a gas turbine engine, the nozzle guide vane or turbine blade comprising:
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at least one internal cooling chamber for passage of cooling air, the at least one cooling chamber including;
(i) a leading edge portion, and (ii) at least one inlet portion through which cooling air enters the at least one cooling chamber from a feed source; anda partitioning element disposed in the at least one inlet portion of the at least one cooling chamber and extending into the at least one cooling chamber to define a sub-chamber wholly or partly within the at least one cooling chamber, the partitioning element and the leading edge portion constitute boundaries of the sub-chamber, the sub-chamber having an inlet configured to receive cooling air from the feed source, the partitioning element including; an axially outer portion, relative to a longitudinal axis of the at least one cooling chamber, extending into an inlet feed passage through which cooling air enters the at least one inlet portion of the at least one cooling chamber from the feed source; and an end portion distal to the inlet feed passage in the at least one cooling chamber bending towards the leading edge portion of the at least one cooling chamber at a short axial distance from the inlet feed passage, such that the partitioning element reduces a cooling air velocity in the sub-chamber to a value smaller than a cooling air velocity in a remainder of the at least one inlet portion of the at least one cooling chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of cooling a leading edge portion of a nozzle guide vane or turbine blade of a gas turbine engine, the nozzle guide vane or turbine blade having at least one internal cooling chamber for passage of cooling air, the least one cooling chamber including a leading edge portion and at least one inlet portion through which cooling air enters the at least one cooling chamber from a feed source, the method comprising:
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providing a partitioning element in the inlet portion of the at least one cooling chamber that extends to define a sub-chamber, bound by the partitioning element and the leading edge portion, wholly or partly within the at least one cooling chamber, the sub-chamber having an inlet configured to receive cooling air from the feed source, the partitioning element including;
(i) an axially outer portion, relative to a longitudinal axis of the at least one cooling chamber, extending into an inlet feed passage through which cooling air enters the at least one inlet portion of the cooling chamber from the feed source; and
(ii) an end portion distal to the inlet feed passage in the at least one cooling chamber bending towards the leading edge portion of the at least one cooling chamber at a short axial distance from the inlet feed passage, such that the partitioning element reduces a cooling air velocity in the sub-chamber to a value smaller than a cooling air velocity in a remainder of the at least one inlet portion of the at least one cooling chamber; andwhen in use, cooling the nozzle guide vane or turbine blade by feeding cooling air from the feed source into both the sub-chamber and the remainder of the at least one cooling chamber.
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Specification