# US 2020/0400035 A1 · Gas turbine induction system, corresponding induction heater and method for inductively heating a component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0400035 A1 - Document ID: US20200400035A1 - Status: Published application - Kind: A1 - Application number: 16/771,714 - Filed: 2018-01-05 - Published: 2020-12-24 - Earliest claimed: 2018-01-05 - Assignees: Siemens Aktiengesellschaft - Applicants: Siemens Aktiengesellschaft - Inventors: Harry Chohan; Sébastien Bouffard; Alexandre Malo; Hayden Smith - Web page: https://patentgrep.com/patent/US20200400035A1 ## CPC - F01D 11/24: by selectively cooling-heating stator or rotor components - F01D 25/12: Cooling - F01D 25/10: Heating, e.g. warming-up before starting - F05D 2260/201: by impingement of a fluid - F05D 2270/303: Temperature - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract An induction heater is employed with a gas turbine engine in order to heat a static component of the gas turbine engine. The heating of the static component is performed such that the clearance space between the static component and a rotating component remains constant during steady state conditions and transient conditions. ## Claims ### Claim 1 A gas turbine engine induction system for inductively heating a component of a gas turbine engine comprising: a gas turbine engine having a longitudinal axis extending lengthwise through the center of the gas turbine engine; an induction heater located proximate to a static component of the gas turbine engine; a rotating component located radially inward from the static component, wherein there is a clearance space between the rotating component and the static component; and wherein the induction heater is adapted to heat the static component so as to maintain substantially the same clearance space between the static component and the rotating component during operation of the gas turbine engine. ### Claim 2 (depends on 1) The system of claim 1, wherein the induction heater is adapted to heat the static component during a transient condition of the gas turbine engine. ### Claim 3 (depends on 1) The system of claim 1, wherein the induction heater ceases heating of the static component during acceleration of the rotating component. ### Claim 4 (depends on 1) The system of claim 1, wherein the induction heater comprises coils surrounding the static component of the gas turbine engine. ### Claim 5 (depends on 4) The system of claim 4, wherein the induction heater further comprises an electric component for supplying current to the coils. ### Claim 6 (depends on 1) The system of claim 1, wherein the static component of the gas turbine engine is a stator. ### Claim 7 (depends on 6) The system of claim 6, wherein the rotating component of the gas turbine engine is a blade. ### Claim 8 An induction heater for a gas turbine engine comprising: a coil adapted to surround a static component of a gas turbine engine, wherein the gas turbine engine has a longitudinal axis extending lengthwise through the center of the gas turbine engine, wherein a rotating component is located radially inward from the static component, wherein there is a clearance space between the rotating component and the static component; and an electric component for transmitting electricity through the coil surrounding the static component, the transmission of electricity heats the static component so as to maintain substantially the same clearance space between the static component and the rotating component during operation of the gas turbine engine. ### Claim 9 (depends on 8) The induction heater of claim 8, wherein the electric component is adapted to supply electricity to the coil during a transient condition of the gas turbine engine. ### Claim 10 (depends on 8) The induction heater of claim 8, wherein the electric component is adapted to cease supplying electricity to the coil during acceleration of the rotating component. ### Claim 11 (depends on 8) The induction heater of claim 8, wherein the static component of the gas turbine engine is a stator. ### Claim 12 (depends on 11) The induction heater of claim 11, wherein the rotating component of the gas turbine engine is a blade. ### Claim 13 (depends on 8) The induction heater of claim 8, wherein the electric component is adapted to supply electricity to the coil during deceleration of the rotating component. ### Claim 14 A method for inductively heating a component of a gas turbine engine comprising: inductively heating a static component, wherein the gas turbine engine has a longitudinal axis extending lengthwise through the center of the gas turbine engine, wherein the gas turbine engine has a rotating component located radially inward from the static component, wherein there is a clearance space between the rotating component and the static component; and starting and ceasing inductively heating of the static component so as to maintain substantially the same clearance space between the static component and the rotating component during operation of the gas turbine engine. ### Claim 15 (depends on 14) The method of claim 14, wherein the step of inductively heating is performed by an induction heater located proximate to the static component of the gas turbine engine. ### Claim 16 (depends on 14) The method of claim 14, wherein the step of starting inductively heating the static component begins during a transient condition of the gas turbine engine. ### Claim 17 (depends on 14) The method of claim 14, wherein the step of ceasing inductively heating the static component occurs during acceleration of the rotating component. ### Claim 18 (depends on 14) The method of claim 14, wherein the step of inductively heating occurs using an induction heater comprising coils surrounding the static component of the gas turbine engine. ### Claim 19 (depends on 18) The method of claim 18, wherein the step of inductively heating occurs using an induction heater comprising an electric component for supplying current to the coils. ### Claim 20 (depends on 14) The system of claim 14, wherein the static component of the gas turbine engine is a stator.