US 12,448,922 B2
Gas turbine engine fuel system
James Coulson, Derby (GB)
Assigned to Rolls-Royce PLC, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Aug. 16, 2024, as Appl. No. 18/807,195.
Claims priority of application No. 2312815 (GB), filed on Aug. 22, 2023.
Prior Publication US 2025/0067218 A1, Feb. 27, 2025
Int. Cl. F02C 7/224 (2006.01); B64D 37/30 (2006.01); B64D 37/34 (2006.01); F02C 3/22 (2006.01); F02C 9/40 (2006.01)
CPC F02C 7/224 (2013.01) [B64D 37/30 (2013.01); B64D 37/34 (2013.01); F02C 3/22 (2013.01); F02C 9/40 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A fuel system for a hydrogen fueled gas turbine engine comprising:
a main hydrogen fuel storage unit configured to store liquid hydrogen, and comprising an ullage space configured to store an ullage fluid comprising gaseous or supercritical hydrogen;
a liquid hydrogen drain line configured to provide liquid hydrogen from the main hydrogen fuel storage unit to a fuel conduit, the fuel conduit being configured to supply hydrogen fuel to a combustor of the gas turbine engine;
a priming line configured to provide the ullage fluid to the fuel conduit; and
a first priming valve configured to selectively control ullage fluid flow through the priming line; and
wherein the priming line is configured to communicate with the fuel conduit upstream of at least a hydrogen fuel pump with respect to the hydrogen fuel flow.