TURBINE ENGINES HAVING HYDROGEN FUEL SYSTEMS

Aircraft propulsion systems and aircraft are described. The aircraft propulsion systems (300) include aircraft systems (304) having at least one hydrogen tank (332) and an aircraft-systems heat exchanger (356) and engine systems (302) having at least a main engine core, a high pressure pump (318), a hydrogen-air heat exchanger (360), and an expander, wherein the main engine core comprises a compressor section, a combustor section having a burner (310), and a turbine section. Hydrogen is supplied from the at least one hydrogen tank (332) through a hydrogen flow path (344), passing through the aircraft-systems heat exchanger (356), the high pressure pump (318), the hydrogen-air heat exchanger (360), and the expander, prior to being injected into the burner (310) for combustion.