US 12,467,410 B2
Gas turbine performance
Craig W Bemment, Derby (GB); Alastair G Hobday, Derby (GB); Benjamin J Keeler, Chesterfield (GB); Christopher P Madden, Derby (GB); Andrea Minelli, Derby (GB); Andrew T Smith, Derby (GB); Peter Swann, Derby (GB); and Martin K Yates, Derby (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc
Filed on May 29, 2024, as Appl. No. 18/677,165.
Application 18/677,165 is a continuation of application No. 18/337,636, filed on Jun. 20, 2023, granted, now 12,044,177.
Claims priority of application No. 2219395 (GB), filed on Dec. 21, 2022.
Prior Publication US 2024/0318600 A1, Sep. 26, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/224 (2006.01); F02C 9/28 (2006.01); F23R 3/28 (2006.01)
CPC F02C 7/224 (2013.01) [F02C 9/28 (2013.01); F23R 3/28 (2013.01); F05D 2260/221 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A gas turbine engine for an aircraft, the gas turbine engine comprising:
a combustor arranged to combust a fuel;
a fuel management system arranged to provide the fuel to the combustor, wherein the fuel management system comprises:
two fuel-oil heat exchangers arranged to have oil and the fuel flow therethrough, the two fuel-oil heat exchangers arranged to transfer heat between the oil and the fuel and comprising a primary fuel-oil heat exchanger and a secondary fuel-oil heat exchanger; and
a fuel pump arranged to deliver the fuel to the combustor, wherein the fuel pump is located between the two fuel-oil heat exchangers; and
a controller that is configured to control the fuel management system so as to transfer between 200 and 600 KJ/m3 of heat to the fuel from the oil in the primary fuel-oil heat exchanger at cruise conditions,
wherein a ratio of heat transfer from the oil to the fuel for the primary fuel-oil heat exchanger and the secondary fuel-oil heat exchanger is between 70:30 and 90:10 at cruise conditions, and
wherein relative to a flow path of the oil starting at an oil tank, the secondary fuel-oil heat exchanger is upstream of the primary fuel-oil heat exchanger.