US 12,435,675 B2
Fuel systems and methods for purging
Owen Ho-Yin Wong, Markham (CA); John Galas, Mississauga (CA); and Sean Durand, Brossard (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Sep. 28, 2023, as Appl. No. 18/374,072.
Application 18/374,072 is a division of application No. 17/228,522, filed on Apr. 12, 2021, granted, now 11,808,219.
Prior Publication US 2024/0044294 A1, Feb. 8, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 9/40 (2006.01); F02C 3/22 (2006.01); F02C 3/24 (2006.01); F23K 5/18 (2006.01); F23R 3/36 (2006.01); F02C 7/22 (2006.01); F02C 7/232 (2006.01)
CPC F02C 9/40 (2013.01) [F02C 3/22 (2013.01); F02C 3/24 (2013.01); F23K 5/18 (2013.01); F23R 3/36 (2013.01); F02C 7/222 (2013.01); F02C 7/232 (2013.01); F05D 2260/602 (2013.01); F23D 2209/30 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of operating a dual-fuel aircraft engine, the method comprising:
feeding a liquid fuel to a combustor of the aircraft engine via a liquid fuel circuit including a dual-fuel nozzle;
feeding a gaseous fuel to the combustor of the aircraft engine via a gaseous fuel circuit including the dual-fuel nozzle;
purging the gaseous fuel circuit of the dual-fuel aircraft engine with an inert gas during shutdown of the aircraft engine to prevent flashback; and
purging the gaseous fuel circuit and the liquid fuel circuit simultaneously with the inert gas.