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Mod 15 > Compressors > Flashcards

Compressors Flashcards

1
Q

What is the primary function of a compressor?

A

To supply a sufficient air quantity for combustion chamber requirements

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2
Q

Where does the compressor get air from and where does it discharge it to?

A

Gets it from air inlet duct and discharges it to the combustion chamber

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3
Q

What is the secondary function of the compressor?

A

To supply systems requiring bleed air

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4
Q

What is the location of the bleed ports based on?

A

Pressure and temperature needed

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5
Q

What are the two main components of a compressor?

A

-compressor rotor
-compressor stator

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6
Q

Describe the compressor stator?

A

Fixed component with stator vanes to guide and slow airflow to increase pressure

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7
Q

What is the combo of a rotor and stator c@lled?

A

Compressor stage

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8
Q

What is a compressor stage?

A

A combination of stator & rotor

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9
Q

What are the two compressor types?

A

-centrifugal flow compressor
-axial flow compressor (for gas turbines)

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10
Q

What do centrifugal compressors consist of?

A

-impeller (rotor)
-diffuser (stator)
-compressor manifold

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11
Q

What is the pressure rise per stage Ona centrifugal compressor?

A

Around 8:1

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12
Q

How many stages are centrifugal compressors limited to and why?

A

2 due to efficiency concerns

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13
Q

What type of entry can an impeller be on centrifugal compressors?

A

Single or double entry

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14
Q

What type of engines are centrifugal compressors typically used on?

A

Turboprop & turboshaft

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15
Q

What does an axial flow compressor consist of?

A

One or more rotating components that have zero foil shaped blades attached

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16
Q

Why do compressors normally use more than one stage?

A

As output from a single stage is small

17
Q

What does increased stages mean for optimal running?

A

Increased difficulty to optimise

18
Q

What are centrifugal flow compressors advantages?

A

-high pressure rise per stage
-efficiency over a wide rotational speed range
-low weight
-simple manufacture
Low cost
Low starting power requirements

19
Q

What are the disadvantages of a centrifugal flow compressor?

A

-large frontal area for a given airflow
-losses in turns between stages

20
Q

What are the advantages of an axial flow compressor?

A

-high peak efficiencies
-small frontal area for given airflow
-straight through flow allowing for high ram efficiency
-increased pressure rise by increasing the number of stages with negligible losses

21
Q

What are the disadvantages of axial flow compressors?

A

-good efficiencies over only a narrow speed range
-difficult to manufacture
-high cost
-relatively high weight
-high starting power requirements

Mod 15 (11 decks)

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