COOLING IN STAGED FUEL SYSTEMS

摘要

A fuel system (100) includes a fuel supply system (102). A plurality of fuel nozzles (104) are connected in fluid communication with the fuel supply system (102) to supply fuel from a fuel source to be issued for combustion from the fuel nozzles (104). A cooling system (106) is included, wherein at least one of the fuel nozzles (104) includes a cooling circuit (15) in addition to a fuel circuit (16) for issuing fuel from the fuel supply system (102) for combustion. The cooling circuit (15) includes an inlet (19) and an outlet (20). The inlet (19) is in fluid communication with the cooling system (106) for circulation of coolant through the cooling circuit (15) and back to the cooling system out the outlet (20) of the cooling circuit (15) for cooling the fuel circuit (16) with the fuel circuit (16) staged off.