The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2026
Filed:
Jun. 20, 2023
Applicant:
Rolls-royce Plc, London, GB;
Inventors:
Christopher P Madden, Derby, GB;
Craig W Bemment, Derby, GB;
Paul W Ferra, Derby, GB;
Benjamin J Keeler, Chesterfield, GB;
Andrea Minelli, Derby, GB;
Peter Swann, Derby, GB;
Martin K Yates, Derby, GB;
Assignee:
ROLLS-ROYCE plc, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F23R 3/34 (2006.01); F02C 7/14 (2006.01); F02C 7/224 (2006.01); F02C 7/228 (2006.01); F02C 9/26 (2006.01); F23R 3/36 (2006.01);
U.S. Cl.
CPC ...
F23R 3/346 (2013.01); F02C 7/14 (2013.01); F02C 7/224 (2013.01); F02C 7/228 (2013.01); F02C 9/263 (2013.01); F23R 3/36 (2013.01);
Abstract
A method of operating a gas turbine engine having a lean burn staged combustion system having a combustor in which fuel is combusted. The gas turbine engine includes a fuel-oil heat exchanger arranged to transfer heat between oil and fuel that is provided to the combustor. The method includes transferring heat from the oil to the fuel before the fuel enters the combustor so as to lower the fuel viscosity to 0.58 mm/s or lower on entry to the combustor at cruise conditions.