15.4 Compressors Flashcards
What are the two functions of a compressor
A. Supply sufficient quantity of air to the combustion chamber
B.supply bleed air
What are the two main components of a compressor
Compressor Rotor and Stator
What makes a compressor stage
Combination of rotor and stator
What are the stator vanes in the fan duct called
Outlet guide vanes (OGVs)
What are the two types of compressors
Centrifugal and axial flow
What makes up a centrifugal compressor
Impeller (Rotor), Diffuser (Stator) and compressor manifold
What is the high pressure per stage ratio for centrifugal compressor
8:1
What are the two main elements of a centrifugal compressor
Impeller and diffuser
How does the axial flow compressor compress air
Whilst air continues to flow in its original direction of flow
Where are axial flow compressor found normally
Turbofan engines
Where would you find centrifugal flow compressors
Turboprop and turboshaft
Advantages of centrifugal flow compressors
High Pressure Rise per stage
Low weight
Low starting power
Efficient
Disadvantages of centrifugal flow compressors
Large frontal area
Losses in turns between stages
Advantages of axial flow compressor
High peak efficiency
Small frontal area
Increased pressure rise by increasing stages
Disadvantages of axial flow compressors
High weight
High starting power
Hard to man up and high cost
