Gas Turbine Design

Question 1

What is it called when a compressor and a turbine are on a single shaft

Answer 1

A spool

Question 2

Where is the highest pressure in the engine located?

Answer 2

Diffuser compressor outlet.

Question 3

What P’s represent the overall pressure ratio?

Answer 3

P3/p1

Question 4

What is the opening of an engine (p)

Answer 4

P1

Question 5

What is the diffuser compressor p?

Answer 5

P3

Question 6

What p is the end of the engine?

Answer 6

P8

Question 7

What is the epr ratio in p’s?

Answer 7

P8/p1

Question 8

What is the name for the front blades on an engine?

Answer 8

Compressor

Question 9

Which is faster N1 or N2?

Answer 9

N2

Question 10

Is N1 high pressure or low pressure?

Answer 10

Low

Question 11

Is N2 high pressure or low pressure?

Answer 11

High pressure.

Question 12

Total flow - core flow = x

Answer 12

Bypass flow

Question 13

How do you calculate the bypass ratio?

Answer 13

Bypass/coreflow

Question 14

If you look into the back end of an engine, will you see a high pressured or low pressured spool?

Answer 14

Low

Question 15

What is the air amulus?

Answer 15

Narrowing of the engine.

Question 16

The turbine in a gas turbine engine generates shaft power using… expansion/compression turning blank into mechanical energy

Answer 16

Expansion - kinetic energy

Question 17

The primary reason for a limitation being imposed on the temperature of the gas flow in a gas turbine engine is to…ensure that the maximum acceptable temperature of the turbine nozzle blank blank is not exceeded.

Answer 17

Guide vanes

Question 18

The diffuser in a centrifugal compressor is a device in which the…pressure and temperature increases/decreases

Answer 18

Increases.

Question 19

The disadvantages of axial flow compressors compared to centrifugal flow compressors are that they… more blank

Answer 19

Expensive