US 12,320,262 B2
Thermal soak-back mitigation
David M Donnelly, Bristol (GB); Derek S Wall, Bristol (GB); and Jonathan Wieland, Bristol (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE PLC, London (GB)
Filed on Nov. 17, 2023, as Appl. No. 18/513,073.
Claims priority of application No. 2218684 (GB), filed on Dec. 13, 2022.
Prior Publication US 2024/0191633 A1, Jun. 13, 2024
Int. Cl. F01D 21/12 (2006.01); F02C 7/268 (2006.01)
CPC F01D 21/12 (2013.01) [F02C 7/268 (2013.01); F05D 2270/3032 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of operating a gas turbine engine having a spool, the method comprising:
executing, by a controller, a shutdown procedure which includes:
performing an idle rotation operation;
determining a parameter associated with a first thermal condition of the gas turbine engine while the idle rotation operation is performed, the parameter being a monitored or predicted pressure at a location in the gas turbine engine;
determining, based on the determined parameter, whether the gas turbine engine has met a pre-determined criterion corresponding to a thermally stabilised condition, wherein the pre-determined criterion includes a thermal stabilization threshold that is a pre-determined value, and the pre-determined value corresponds to a pressure value threshold; and
terminating the idle rotation operation in response to a determination that the gas turbine engine has met the pre-determined criterion.