Compound nozzle cooled engine
First Claim
1. A gas turbine engine comprising:
- a fan, compressor, combustor, high pressure (HP) turbine, and low pressure turbine in serial flow communication;
said compressor including rows of compressor blades for pressurizing air sequentially in corresponding stages;
said HP turbine including a nozzle having a row of stator vanes followed by a row of rotor blades;
each of said vanes having circumferentially opposite pressure and suction sides extending in span radially and in chord axially between opposite leading and trailing edges, and being hollow with an imperforate septum bridging said opposite sides to define forward and aft cooling channels feeding corresponding first cooling holes along said leading edge and second cooling holes along said trailing edge;
a first bleed circuit joined in flow communication between a last stage of said compressor and said vane forward channels to provide thereto pressurized primary air at a first pressure; and
a second bleed circuit joined in flow communication between an intermediate stage of said compressor and said vane aft channels to provide thereto pressurized secondary air at a second pressure less than said first pressure.
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Accused Products
Abstract
A gas turbine engine includes a compressor, combustor, and high pressure turbine operatively joined together. The turbine includes a nozzle followed by a row of rotor blades. A first bleed circuit is joined in flow communication between the last stage of the compressor and a forward cooling channel in vanes of the nozzle for feeding first cooling holes therein with pressurized primary air at a first pressure. A second bleed circuit is joined in flow communication between an intermediate stage of the compressor and aft cooling channels in the nozzle vanes to feed second cooling holes with pressurized secondary air at a second pressure less than the first pressure.
45 Citations
22 Claims
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1. A gas turbine engine comprising:
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a fan, compressor, combustor, high pressure (HP) turbine, and low pressure turbine in serial flow communication; said compressor including rows of compressor blades for pressurizing air sequentially in corresponding stages; said HP turbine including a nozzle having a row of stator vanes followed by a row of rotor blades; each of said vanes having circumferentially opposite pressure and suction sides extending in span radially and in chord axially between opposite leading and trailing edges, and being hollow with an imperforate septum bridging said opposite sides to define forward and aft cooling channels feeding corresponding first cooling holes along said leading edge and second cooling holes along said trailing edge; a first bleed circuit joined in flow communication between a last stage of said compressor and said vane forward channels to provide thereto pressurized primary air at a first pressure; and a second bleed circuit joined in flow communication between an intermediate stage of said compressor and said vane aft channels to provide thereto pressurized secondary air at a second pressure less than said first pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A gas turbine engine comprising:
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a multistage compressor disposed in serial flow communication with a combustor and high pressure (HP) turbine; said turbine including a nozzle having a row of stator vanes followed by a row of rotor blades; each of said vanes including a forward cooling channel feeding first cooling holes, and an aft cooling channel feeding second cooling holes; a first bleed circuit joined in flow communication between a last stage of said compressor and said vane forward channels to provide thereto pressurized primary air at a first pressure; and a second bleed circuit joined in flow communication between an intermediate stage of said compressor and said vane aft channels to provide thereto pressurized secondary air at a second pressure less than said first pressure. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of cooling first stage nozzle vanes following in turn a combustor and compressor in a gas turbine engine, comprising:
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bleeding primary air from the last stage of said compressor to a forward cooling channel in said vanes for discharge from first cooling holes therein; and bleeding secondary air from an intermediate stage of said compressor to an aft cooling channel in said vanes for discharge from second cooling holes therein. - View Dependent Claims (22)
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Specification