# US 2025/0146441 A1 · Turbine cooling air pressure boost system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146441 A1 - Document ID: US20250146441A1 - Status: Published application - Kind: A1 - Application number: 18/386,381 - Filed: 2023-11-02 - Published: 2025-05-08 - Earliest claimed: 2023-11-02 - Assignees: Rtx Corporation - Applicants: RTX Corporation - Inventors: Jorn A. Glahn; Kimberly J. Liang; Christopher J. Hanlon - Web page: https://patentgrep.com/patent/US20250146441A1 ## CPC - F02C 6/08: the gas being bled from the gas-turbine compressor - F02C 7/12: Cooling of plants (of component parts, see the relevant subclasses, e.g. F01D; cooling of engines in general F01P) - F02C 7/18: the medium being gaseous, e.g. air {(F02C7/125 takes precedence)} - F02C 7/32: Arrangement, mounting, or driving, of auxiliaries - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An electrically boosted cooling air system including a high pressure compressor; at least one cooling air supply line coupling the high pressure compressor with at least one of a high pressure turbine and a low pressure turbine; and an electrically powered centrifugal compressor fluidly coupled with the at least one cooling air supply line; wherein the electrically powered centrifugal compressor is configured to provide at least one of a pressure increase and a flow rate increase for cooling air supplied from the high pressure compressor. ## Claims ### Claim 1 An electrically boosted cooling air system comprising: a high pressure compressor; at least one cooling air supply line coupling the high pressure compressor with at least one of a high pressure turbine and a low pressure turbine; and an electrically powered centrifugal compressor fluidly coupled with the at least one cooling air supply line; wherein the electrically powered centrifugal compressor is configured to provide at least one of a pressure increase and a flow rate increase for cooling air supplied from the high pressure compressor. ### Claim 2 (depends on 1) The electrically boosted cooling air system according to claim 1, wherein said at least one cooling air supply line includes a first cooling air supply line fluidly coupled between the high pressure compressor and the high pressure turbine. ### Claim 3 (depends on 1) The electrically boosted cooling air system according to claim 1, wherein said at least one cooling air supply line includes a second cooling air supply line fluidly coupled between the high pressure compressor and the low pressure turbine. ### Claim 4 (depends on 3) The electrically boosted cooling air system according to claim 3, wherein said first cooling air supply line is fluidly coupled with at least one of the high pressure compressor sixth stage, seventh stage, eighth stage, ninth stage and tenth stage. ### Claim 5 (depends on 2) The electrically boosted cooling air system according to claim 2, wherein said second cooling air supply line is fluidly coupled with at least one of the high pressure compressor second stage, third stage and fourth stage. ### Claim 6 (depends on 1) The electrically boosted cooling air system according to claim 1, wherein said electrically powered centrifugal compressor is configured to provide additional cooling air pressure and cooling air flow rate responsive to a predetermined gas turbine engine demand for cooling air. ### Claim 7 (depends on 6) The electrically boosted cooling air system according to claim 6, wherein said predetermined gas turbine engine demand for cooling air is selected from the group consisting of a power demand above a cruise operation condition; an off-normal engine operation condition, a certification testing engine operation condition; and a gap in cooling air source pressure. ### Claim 8 A gas turbine engine with electrically boosted cooling air system comprising: a high pressure compressor; a high pressure turbine; a low pressure turbine; a first cooling air supply line fluidly coupled between the high pressure compressor and the high pressure turbine; a second cooling air supply line fluidly coupled between the high pressure compressor and the low pressure turbine; and an electrically powered centrifugal compressor fluidly coupled with at least one of the first cooling air supply line and the second cooling air supply line; wherein the electrically powered centrifugal compressor is configured to provide at least one of a pressure increase and a flow rate increase for cooling air supplied from the high pressure compressor. ### Claim 9 (depends on 8) The gas turbine engine with electrically boosted cooling air system according to claim 8, wherein at least one of the first cooling air supply line and the second cooling air supply line are fluidly coupled with a bleed air source having a pressure below a predetermined value; wherein said electrically powered centrifugal compressor is configured to increase the pressure of the cooling air to the predetermined value. ### Claim 10 (depends on 8) The gas turbine engine with electrically boosted cooling air system according to claim 8, wherein the electrically powered centrifugal compressor is configured to adjust cooling air supply pressure and flow rate requirements responsive to changes in turbine sink pressures, said turbine sink pressures being responsive to variable shaft horsepower extractions due to spool and engine load sharing. ### Claim 11 (depends on 8) The gas turbine engine with electrically boosted cooling air system according to claim 8, wherein the electrically powered centrifugal compressor is fluidly coupled with the first cooling air supply line and another electrically powered centrifugal compressor is fluidly coupled with the second cooling air supply line. ### Claim 12 (depends on 8) The gas turbine engine with electrically boosted cooling air system according to claim 8, wherein said electrically powered centrifugal compressor is configured to be rotated by the cooling air flowing through at least one of the first cooling air supply line and the second cooling air supply line to generate electrical power. ### Claim 13 (depends on 8) The gas turbine engine with electrically boosted cooling air system according to claim 8, wherein the electrically powered centrifugal compressor is configured to operate during a hot shutdown engine condition to provide ventilation to the gas turbine engine. ### Claim 14 A process for electrically boosting a gas turbine cooling air system comprising: fluidly coupling at least one cooling air supply line between a high pressure compressor and at least one of a high pressure turbine and a low pressure turbine; fluidly coupling an electrically powered centrifugal compressor with the at least one cooling air supply line; providing at least one of a pressure increase and a flow rate increase with the electrically powered centrifugal compressor for cooling air supplied from the high pressure compressor. ### Claim 15 (depends on 14) The process of claim 14, further comprising: providing additional cooling air pressure and cooling air flow rate with the electrically powered centrifugal compressor responsive to a predetermined gas turbine engine demand for cooling air. ### Claim 16 (depends on 15) The process of claim 15, wherein said predetermined gas turbine engine demand for cooling air is selected from the group consisting of a power demand above a cruise operation condition; an off-normal engine operation condition, a certification testing engine operation condition; and a gap in cooling air source pressure. ### Claim 17 (depends on 14) The process of claim 14, further comprising: fluidly coupling the at least one cooling air supply line with a bleed air source having a pressure below a predetermined value; and increasing the pressure of the cooling air to the predetermined value employing said electrically powered centrifugal compressor. ### Claim 18 (depends on 14) The process of claim 14, further comprising: adjusting a cooling air supply pressure and a flow rate requirement employing said electrically powered centrifugal compressor responsive to changes in turbine sink pressures, said turbine sink pressures being responsive to variable shaft horsepower extractions due to spool and engine load sharing. ### Claim 19 (depends on 14) The process of claim 14, further comprising: generating electrical power employing said electrically powered centrifugal compressor configured to be rotated by the cooling air flowing through the cooling air supply line. ### Claim 20 (depends on 19) The process of claim 19, further comprising: providing ventilation to the gas turbine engine; and operating the electrically powered centrifugal compressor during a hot shutdown engine condition.