All Flashcards
Centrifugal flow compressor
Air is forced centrifugally outward into a diffuser
Diffuser
After compressor and before combustion, reduces high velocity compressor discharge air to a slower velocity. Prepares air for entry into combustion
axial flow compressor
rotor and stator, rotor sends air rearward and stator blades act as diffusers
EPR
Engine pressure ratio- turbine discharge to compressor inlet pressure
Itt
temp of air btwn high and low pressure turbine wheels
n1
Low pressure compressor
n2
high pressure compressor
What effects performance of a turbine eng
Air density and temperature
Fuel control unit
FADEC, DEEC, Hydromechanical are examples. They meter the appropriate amount of fuel to the eng based on temp, lever position, eng rpm
How to prevent ice crystals in fuel
Oil to fuel heat exchanger and fuel air heat exhangers
Collector tank
tank within a tank. makes sure there is an adequate supply of fuel to eng
Motive flow
Result of a pump producing fuel pressure via a venturi
wet vs dry sump oil
Wet is when oil is stored in the eng, dry is when oil is stored somewhere else
What part of the eng is the most critical to be lubricated
Exhaust turbine bearing due to the really hot temps
Hydraulic accumulator
Nitrogen stored under pressure to drive hydraulic fluid for shock absorption to provide additional hydraulic fluid
Hydraulic actuator
Transforms energy in the form of fluid pressure to mechanical movement
Pump cavitation
When air enters hydraulic lines. Can cause pump to overheat and eventually fail
lead acid battery
in discharging, chemical energy is turned into electrical energy, In charging, vice versa
Generator
Device that converts mechanical energy to electrical energy by electromagnetic induction
GCU
Controls start
overvoltage protection
parallels the gens
fault protection
Inverter
Converts DC to AC power.
Advantages of ac over dc
Transmitted over longer distances.
more economic
space and weight saved.
Bus tie
Connects elecctrical buses, isolates buses,
and can redirect power so one bus can power entire system
Diode
Allows current to flow in one direction only. Electronic check valve
Hot battery bus
bus that is connected directly to the battery.
transformer
Changes electical energy of a given voltage into a diff voltage.
Relay
Remote control of circuits carrying heavy currents.
Solenoid
Electric switch with a moveable core.
Circuit breaker
Designed to break the Circuit and stop current flow when currecnt exceeds
Fuse
Strip of metal that will melt when current in excess of its capacity flows through it
Current limiter
Sectionalize an aircraft circuit
Volts
potential electric force (water pressure)
Current
Rate at which charge is flowing (flow rate)
Amps
Rate of electron flow
Diluter demand
Only when user inhales. Has regulators that automatically mix cabin air and oxg.
