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10697215
Fuel Feed System: Function
Descrição
Aeronautical Engineering (M11 Mind Maps) Mapa Mental sobre Fuel Feed System: Function, criado por Kenzie Evans em 04-10-2017.
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aeronautical engineering
m11 mind maps
Mapa Mental por
Kenzie Evans
, atualizado more than 1 year ago
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Criado por
Kenzie Evans
mais de 6 anos atrás
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Resumo de Recurso
Fuel Feed System: Function
Two methods of Pressure Controlled Fuel Feed
High Pressure Pumps
Also called override and jettison pumps
Deliver twice as much pressure as standard boost pumps
Forces discharge check valves on standard pumps to close
Prevents fuel flow from standard pumps
Sequence Valves
Installed at the pump outlets of standard boost pumps
Reduce output pressure
Allows some fuel back into the tank
Electrical Fuel Feed Management
Performed automatically
Controlled in accordance with flight phases
Taxiing phase, centre tank feeds engines
Other pumps on standby
Take-off phase
Occurs when flaps are extended for take-off
Engines supplied individually
Two boost pumps from each main tanks 2 and 3 (engines 2 and 3 respectively)
Double capacity centre tank boost pumps for engines 1 and 4
Cruise phase
After take-off when flaps have been retracted
Centre tanks and stabilizer tank are emptied first
Inner main tanks used next
All engines now supplied by double capacity override and jettison pumps in main tanks 2 and 3
Fuel Scavange
Reduces amount of non-usable fuel in the tanks
Most commonly used method uses jet pumps
Boost pumps supply jet pumps with pressure they need for operation
Scavenged fuel is pumped to the main inner tank
Another method uses electrically driven scavenge pump
Controlled automatically as fuel level drops below certain threshold
Pump fuel into a main tank
Fuel Recirculation
Ensures proper cooling of engine oil and integrated drive generator oil
Fuel from tank is pumped through engine oil cooler which heats the fuel and cools the engine oil
Fuel then passes through the high pressure gear driven engine pump to the burners on the engine
Some fuel is diverted and passes through a bypass valve
Proceeds to the Integrated Drive Generator (IDG) cooler
Fuel is heated further and then recirculated and mixed with new fuel ready to repeat the process
Works well until engine runs at lower speed and there is a high electrical load on the IDG
As engine runs slower, the cooling becomes critical as there may not be enough fuel for cooling
Solenoid activates on the fuel return valve
Return valve opens and returns fuel to the tank
Cool fuel is mixed to cool down the hot fuel
Fuel Boost Pumps
Generally impeller type
Impeller forces fuel from the inlet to the pump outlet by centrifugal force
Boost pump can be removed from canister without draining fuel
Special removal valve shuts off the fuel inlet as the pump is pulled out
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