15.3 INLET Flashcards
what is the engine air inlet designed to do
provide distortion free airflow into the engine
what does IGV stand for
inlet guide vane
what do the inlet guide vanes do
straighten airflow and direct it to compressor
what is a divergent duct
opens up, velocity decrease, pressure increase, temp increase
what is a convergent duct
closes up, velocity increases, pressure decreases, temp decreases
what happens when there is supersonic flow through a convergent or divergent duct
the properties are the oposite
what does FOD stand for
foreign object damage
what is the use for divided entrance ducts
split air to either side of an aircraft
why are divided ducts used
sudden flight manoeuvres, imbalance in RAM pressure
whats the main function of the variable geometry duct
provide correct amount of air to the engine inlet
what does the variable geometry duct do to the air
decrease velocity and increase static pressure
what do compressor inlet screen protect from
FOD
whats a disadvantage of the compressor inlet screens
ice build up, disturbed airflow
what are bellmouth compressor inlets used for
engine tests, measuring airflow
are there and duct losses with a bellmouth duct
no
what is used on turboprop and shaft engines to prevent ice build up
conical spinner
what can be used to deflect dirt from the intake
deflector doors
on a turbofan engine what do the fan blades reduce
damage from foreign objects
where is warm air circulated for anti icing on a turbofan engine
the lip
what can ice cause to the engine
disturbed airflow, ingested ice
what are 2 types of engine anti ice systems
bleed air, electrical heating
where is hot bleed air from in the engine
HP compressor
what do turboprops use for the spinner anti icing
warm engine oil
what is used to limit the bleed air for anti icing and prevent over pressure
anti icing valves
what is the regulator valve controlled with
solenoid controlled
when are electro thermal anti icing systems used
only when the engine is running
