M15.3 Inlet Flashcards
What is used to straighten the airflow and direct air into the first stage compressor
Inlet guide vanes
What is ram recovery or total pressure recovery
When trapped air molecules begin to be compressed in the inlet, pressure loss is recovered. Pressure at inlet increases the pressure and airflow to the engine
What type of engine duct is used for high speed, single or twin engine aircraft
Divided entrance duct
What is a disadvantage of divided duct
Can cause imbalance in ram air pressure
What is the function of variable geometry duct
Provide correct amount of air to the engine inlet
What are the three methods to diffuse the inlet air and slow the inlet airflow
A. Vary the area or geometry of the inlet duct
B.use variable airflow bypass
C. Use a shockwave in the airstream
Where are bellmouth compressor inlets used
Engines undergoing testing
What two effects does ice have in an engine inlet
A. Disturbed airflow reduces the performance leading to compressor stall
B. Damage the engine
What do turboprop engines uses as anti ice
Warm oil from engine oil reservoir with small amount of hot air
What is the main source for engine anti ice
Hot bleed air
What is used on engine cowls for anti icing
Electrical heat strips
What temp does ice form in the inter in dry air and moist air
5’C in dry air and 7’C in moist
What section of the engine takes bleed air for anti icing
HP compressor
If you get a latched relay to be tripped for Low/High duct pressure/Temp for anti ice system what should you do
Reset must be performed
