Module 7

Question 1

What do turbines do?

Answer 1

They turn the fan/propeller, and compressors and accessories

Question 2

This type of Turbine is primarily used on APUs and small engines

Answer 2

Radial Inflow

Question 3

Axial Flow turbines consist of 4 basic elements:

Answer 3

Case Stators Shroud Rings Rotors

Question 4

What do stators do?

Answer 4

Increase air velocity and direct air onto the rotors

Question 5

What do shroud rings do?

Answer 5

Minimize gas loss

Question 6

What do Rotors do?

Answer 6

Turn the compressors

Question 7

What does each stage of a turbine consist of?

Answer 7

Stator, Rotor

Question 8

Where are Nozzle guide vanes located?

Answer 8

First stage of stators, aft of the combustion chamber

Question 9

Some Engines use _________________ where HP Turbines turn in one direction and LP turbines turn in the other to reduce vibration

Answer 9

Counter-Rotating Turbines

Question 10

Newer stator vanes are coated with _______ for improved thermal efficiency

Answer 10

CMC

Question 11

High Speed rotor (N₂) will use ______________ blades

Answer 11

Open Tip

Question 12

Low Speed Rotor (N₁) will use ___________ blades

Answer 12

Shrouded

Question 13

What are the types of Turbine Blade Types?

Answer 13

Impulse, Reaction, Impulse-Reaction

Question 14

__________ blades change direction of airflow with no change to pressure or velocity

Answer 14

Impulse

Question 15

__________ blades increase velocity and decrease Pressure

Answer 15

Reaction

Question 16

___________ blades is where base is impulse shaped, tip is reaction shaped

Answer 16

Impulse-Reaction

Question 17

How are blades cooled?

Answer 17

Stators and blades are hollow and drilled with holes to allow air to enter (Known as convection or film cooling)