Abstract
In order to reduce a weight of a fuel system and decrease the fuel temperature rise generated by a fuel system itself, the fuel system which has both a gear pump and a centrifugal pump with operation mode switching capability for a turbofan engine were studied. The fuel system can decrease the work of pumps by unloading one of pumps and can be configured without a variable displacement pump that has a complicated structure and sensitive for contaminant. During mode switching of fuel pumps, inlet fuel flow rate or inlet fuel pressure of a fuel metering unit is varied by mode switching valves. Pulsated fuel flow or fuel pressure affect the metered fuel flow that should be kept within tolerance. In this paper, mode switching procedures that can reduce fuel flow drift are proposed. Validity of the procedures is evaluated by AMESim simulation.
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