US 11,719,169 B2
Gas turbine engine with heat exchanger diagnostics
Frederick M. Schwarz, Glastonbury, CT (US); and Nathan A. Snape, Tolland, CT (US)
Assigned to Raytheon Technologies Corporation, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Apr. 14, 2022, as Appl. No. 17/720,587.
Application 17/720,587 is a division of application No. 15/271,274, filed on Sep. 21, 2016, granted, now 11,346,288.
Prior Publication US 2022/0243665 A1, Aug. 4, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 9/18 (2006.01); F02C 7/18 (2006.01); G01M 15/09 (2006.01); F02K 3/115 (2006.01)
CPC F02C 9/18 (2013.01) [F02C 7/185 (2013.01); F02K 3/115 (2013.01); G01M 15/09 (2013.01); F05D 2260/213 (2013.01); F05D 2260/80 (2013.01); F05D 2270/053 (2013.01); F05D 2270/112 (2013.01); F05D 2270/301 (2013.01); Y02T 50/60 (2013.01)] 18 Claims
OG exemplary drawing
 
1. The method comprising:
tapping compressed cooling air from a compressor section in a gas turbine engine and passing the cooling air through a first fluid connection to a heat exchanger, and returning air from the heat exchanger through a second fluid connection back to at least one of the compressor section and a turbine section in the gas turbine engine for cooling;
sensing a sensed condition of the returning air downstream of the heat exchanger and comparing the sensed condition of the returning air to an expected condition in a control;
identifying a potential concern in a cooling air system should the sensed condition differ from the expected condition by more than a predetermined amount; and
the sensed condition being indicative of a failure in at least one of the heat exchanger, the first fluid connection, or the second fluid connection, and the control setting a maintenance flag such that when the returning air is not properly passing to the at least one of the compressor section and the turbine section the maintenance flag is set.