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Turbine Engines > Module 7: Turbines Review > Flashcards

Module 7: Turbines Review Flashcards

1
Q

What is the sole purpose of a turbine?

A

Drive the COMPRESSOR

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2
Q

What does the turbine use to drive the compressor?

A

energy from the COMBUSTOR

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3
Q

What are the 2 types of turbines?

A

Axial

Radial Inflow

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4
Q

These types of turbines are used for APUs and small engines?

A

Radial Inflow

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5
Q

Advantages of Radial Inflow turbine?

A

low cost
simple
high single stage efficiency

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6
Q

What are the disadvantages of Radial Inflow?

A

limited to one stage
short service life
low axial velocity

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7
Q

What are the 4 basic elements of an AXIAL flow turbine?

A

Case
Stator (NGV)
Shroud Rings
Rotors

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8
Q

Where are NGVs located, and what are they?

A

Nozzle Guide Vanes are stators that are located at the beginning of the turbine

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9
Q

Compressor vs Turbine design

A

Turbine blades get LONGER towards the back

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10
Q

The 4 types of Axial Flow turbines?

A

Single/Double/Triple Spool

Free Turbine

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11
Q

2 purposes of Turbine Stators?

A
  1. Direct Air at the correct angle

2. increase velocity (convergent stators)

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12
Q

What will improve thermal efficiency?

A

CMCs

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13
Q

Shaft, disk, and blades are all part of what?

A

The Turbine Rotor

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14
Q

How are Turbine Blades most commonly attached with?

A

Fir Tree for radial movement

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15
Q

Open blades are used for what?

A

High Speed Rotor

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16
Q

Low speed rotors use what?

A

Shrouded blades

17
Q

What are the types of turbine blades?

A

Impulse
Reaction
Impulse Reaction

18
Q

What do we use to cool the turbine?

A

Compressor bleed air

19
Q

What sections to we usually keep cool?

A

Front/Aft disk faces

20
Q

Stators and blades are hollow and drilled with holes to allow air to enter at the root or base and exit at the tip, leading edge & trailing edge, what is this called?

A

Convection/film cooling

Turbine Engines (12 decks)

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