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. 09, 2023
Filed:
Jun. 29, 2022
Rolls-royce Plc, London, GB;
Craig W Bemment, Derby, GB;
Benjamin J Keeler, Derby, GB;
Paul W Ferra, Derby, GB;
Alastair G Hobday, Derby, GB;
Kevin R McNally, Derby, GB;
Andrea Minelli, Derby, GB;
Martin K Yates, Northamptonshire, GB;
ROLLS-ROYCE plc, London, GB;
Abstract
A propulsion system for an aircraft includes a gas turbine engine and a fuel tank, wherein the fuel includes at least a proportion of a sustainable aviation fuel—SAF—having a density between 90% and 98% of the density, ρ, of kerosene and a calorific value between 101% and 105% the calorific value CV, of kerosene. The engine includes a combustor; and a fuel pump arranged to supply a fuel thereto at an energy flow rate, C, the pump being arranged to output fuel at a volumetric flow rate, Q, the percentage of fuel passing through the pump not provided to the combustor being referred to as a spill percentage. The fuel include X % SAF, where X % is in the range from 5% to 100%, and has a density, ρ, and a calorific value CV. The propulsion system is arranged so: