What bis the main function of compressor section?
to SUPPLY a sufficient quantity of air to satisfy engine requirements
How does a compressor work?
It receives air from the inlet duct and delivers it to the diffuser, prior to entering the combustion chamber
Compressor effectiveness is measured as a ratio of the ______ at the output versus that of the input
Static pressure
common overall compressor ratios are:
15:1 to 40:1
Types of Compressors
Centrifugal
Axial
Combination
- Type of compressor that consist of an IMPELLER, DIFFUSER and COMPRESSOR manifold
- Intake air enters the impeller near the hub
- compression is accomplished by the impeller centrifuging the air out through the diffuser
- the diffuser vanes form a divergent duct, increasing static pressure and decreasing velocity
Centrifugal - Flow Compressors
- high pressure rise per stage
- good compression efficiencies over wide rotational speed range
- low cost, due to simplicity of manufacturing
- low weight
- low starting power requirements
Advantages of Centrifugal-Flow Compressors
- Type of compressor that each stage is comprised of a rotating rotor followed by a stationary rotor.
- inlet guide vanes (IGVs) are installed at the front to direct air into the first stage rotor at the correct angle
Axial - Flow Compressors
______ are installed at the front to direct air into the first stage rotor at the correct angle
Direct the air into the first stage rotor, causing a very slight increase in velocity and drop in pressure (due to draw from the first stage rotor)
Purpose of Inlet Guide Vanes?
