Compressor

Question 1

What bis the main function of compressor section?

Answer 1

to SUPPLY a sufficient quantity of air to satisfy engine requirements

Question 2

How does a compressor work?

Answer 2

It receives air from the inlet duct and delivers it to the diffuser, prior to entering the combustion chamber

Question 3

Compressor effectiveness is measured as a ratio of the ______ at the output versus that of the input

Answer 3

Static pressure

Question 4

common overall compressor ratios are:

Answer 4

15:1 to 40:1

Question 5

Types of Compressors

Answer 5

Centrifugal

Axial

Combination

Question 6

• 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

Answer 6

Centrifugal - Flow Compressors

Question 7

• 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

Answer 7

Advantages of Centrifugal-Flow Compressors

Question 8

• 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

Answer 8

Axial - Flow Compressors

Question 9

______ 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)

Answer 9

Purpose of Inlet Guide Vanes?