There is provided a method (300) of operating a gas turbine engine (10). The gas turbine engine (10) comprises an accessory gearbox (110) configured to power one or more engine accessories, and a combustor (16) in which fuel is combusted and a fuel-oil heat exchanger (114) arranged to transfer heat between oil and fuel that is provided to the combustor (16). An average temperature of lubricating oil is at least 180°C on exit from the accessory gearbox (110) at cruise conditions. The method (300) comprises transferring heat (301) from the oil to the fuel before the fuel enters the combustor (16) so as to raise the fuel temperature to an average of at least 135°C on entry to the combustor (16) at cruise conditions. Also provided is a gas turbine engine.
Accessory gearbox
2024-08-14
Patent
Electronic Resource
English
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