US 12,270,713 B2
Heat exchanger differential oil temperature determination
Kashif Mohammed, Brossard (CA); and Robin Watt, Burlington (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by Pratt & Whitney Canada Corp., Longueuil (CA)
Filed on Aug. 23, 2023, as Appl. No. 18/454,160.
Prior Publication US 2025/0067602 A1, Feb. 27, 2025
Int. Cl. G01K 3/14 (2006.01); F02C 3/04 (2006.01); F02C 7/12 (2006.01); G01K 5/52 (2006.01)
CPC G01K 3/14 (2013.01) [F02C 3/04 (2013.01); F02C 7/12 (2013.01); G01K 5/52 (2013.01); F05D 2260/20 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A gas turbine engine comprising:
a compressor section and a turbine section;
a heat exchanger operable to cool a fluid utilized by a component of the gas turbine engine, the heat exchanger having a fluid inlet and a fluid outlet;
a strain gauge associated with the fluid inlet and operable to produce a signal indicative of a temperature of the fluid at the fluid inlet and a strain gauge associated with the fluid outlet and operable to produce a signal indicative of a temperature of the fluid at the fluid outlet, and a controller for determining a temperature differential across the heat exchanger by utilizing the signal from the strain gauge at the fluid inlet and the signal from the strain gauge at the fluid outlet; and
wherein each of the strain gauges at the fluid inlet and the fluid outlet include a conductor member mounted on a substrate and a voltage applied across the conductor member, such that as the substrate expands and contracts the conductor member is deformed and a voltage change can be determined and a difference between a voltage change at the strain gauge associated with the fluid inlet compared to a voltage change at the strain gauge associated with the fluid outlet can be utilized to determine the temperature differential.