Aircraft fuel system.pptx manhar singh
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Transcript of Aircraft fuel system.pptx manhar singh
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AIRCRAFT FUEL SYSTEM
MANHAR M.TECH(1ST YEAR)
15AE60R18
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AIRCRAFT FUEL Reciprocating engine fuelsTurbine engine fuels
• Jet A- Which is Kerosene• Jet B- A blend of kerosene & gasoline• Jet A-1- used for operation at extremely low Temperature
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Water contaminaion Water contamination in fuel can be in two form
Dissolve in the fuelEntrained or suspended
Water in fuel can cause icing in the aircraft fuel system usesally in
•Boost Pump Screens•Low pressure filters
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Fuel systemThe purpose of an aircraft fuel system is to store and deliver the proper amount of clean fuel at the correct pressure to the engineFuel system should provide positive & reliable fuel flow through all phases of flight including
Change in altitudesViolent maneuversSudden acceletration & deceleration
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Fuel system (conti)Fuel system should also continous monitor system opration such as
Fuel pressureFuel flow warning singnalTank quantity
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Type of fuel system Fuel system can be classified in two broad categories
Gravity feed csystem Pressure feed system
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Fuel system componentPump TanksLines valvesFuel flow meters Filters & stainerQuantity indicatorWarning components Fuel drains heaters
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Fuel pumpsFuel pumps are used to move fuel through the system than gravity feed is insufficiet.There are three main funtions of fuel pumps they are to move fuel.
The tank to the engineOne tank to another The engine back to the tank
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Fuel pump requirementsEngine fuel system require main pumps and in some system emergincy pumps
There requiremant depends on the type of engine installed on the aircraft
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Reciprocating engine fuel pump requirement
Reciprocating engines which are not gravity fed require
At least one main pump for each engine There pumps must be engine drivenThe pump capacity must capable of providing enough fuel flow for all aperation
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Tubine-engine fuelpump requirmentTurbine engine requirement
At least one main pump for each engine Main pump power supply must be indepndent of
all other main pump power supplies Each positive aisplacement main pump must be
able to be bypassed
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fuel pump classification
One way to classify fuel pumps is according to the pumps funtion.There classification are
Boost pumpScavenge pumpCross-feed pump
Another way to classify fuel pump is by then methods of operationThose pump are.
Vane-type Variable- volume
Centrifugal Ejector
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Fuel TanksFuel system on different aircraft may use several types of fuel tanksThe Three basic types of fuel tanks used on aircraft are.
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Integal fuel tanksIntergral fuel tanks are commonly located in the aircraft wing or fuselage
There tanks are ones that are built into structure of the aircraft &generally can’t be removed
Integral fuel tanks are formed by the actual structure of the aircraft
This type ao tanks is used in some light hight-performance aircraft
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Rigid removable fuel tanksRigid removable fuel tanks are often made of aluminium component that are welded togetherThere tanks are in installed in compartment specifically made for the tanks
The tank may be held in place with padded strapsThis types of tank is often found on more expensive light aircraft
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Bladder type fuel tanks
Bladder type fuel tank are bassically a reinforced rebberized bag
There tank are installsd in compartment which support thw weight of the fuel
These tank id held in palce with bottom & slides og the tank
This type of tank is usually found on light aircraft
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Fuel lineFuel lines on aircraft are either made of rigid metal tubing or flexible hose
Most of the fuel line are the regid type which are usually made of aluminium alloy
The flexible hose fuel lines are either made of synthetic rubber or tefton The diameter of tubing used is decided by the engine fuel requirement
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Valves Fuel selector valves sre used in aircraft aff system to
Shot off fuel flowCross –feedTransfer- fuel
Selector valves may be operated manually or electrically depending on the installation
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Flighters and strainers
Fuel is usually strained at the point in the system
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Quantity indicatorsMechanical
Inverted float gauge
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Fuel subsystemSome aurcraft fuel system allow for fuel