Lubrication ( ͡° ͜ʖ ͡°) Flashcards
What type of sumps are most common in turbine engines
Dry
Which is a more efficient way of cooling oil?
Using a FOHE or air cooling
FOHE fuel-oil heat exchanger
Purpose of check valves
Prevent oil from draining to the lower parts of the engine
Bypass valves open up to alleviate oil pressure. Why is this done
Because high oil pressure can damage the coolers and filters
What is the purpose of chip detectors or magnetic plugs
They attract and hold onto metal debris
What does SOAP mean
Spectrometric oil analysis program
Functions of oil
Lubrication
Cooling
Cleaning
Synthetic oils are best for a turbine engine. What are the requirements of the oil to perform best
Low viscosity
High viscosity index
Anti foaming qualities
High flash point
Low pour point
Two types of recirculatory lubrication systems are
Pressure relief valve system (spring loaded)
Full fuel system
Hottest parts of the engine
NGVs
Turbine
Turbine disc
Compressor bleed air (tertiary air) cools NGVs and the turbine by?
Low pressure air internally
High pressure air blown into blades and vanes forming a heat barrier
What is sealing used for
Prevent oil leaking from bearing chambers
To direct and control cooling air flows
Preventing combustion gas entering into the turbine disc cavities
