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1

What type of engines have combustion occur MOMENTARILY in a CYLINDRICAL flow?

Reciprocating engines!
(Intake, Compression, COMBUSTION, Exhaust)

2

What type of engines have combustion occur CONTINUOUSLY in ONE location?

Turbine engines!

3

What are the 4 engine sections?

1. Fan (Intake)
2. Compressor
3. Combustor
4. Turbine (Exhaust)

4

Newton's 2nd Law

F = ma

5

Increasing temperature causes gas to:

Expand!

6

A ____ accelerates gas flow at the trailing edge of the turbine

Nozzle

7

A ____ decelerates streamlines in conventional air intake design

Diffuser

8

What are the 4 different types of Turbo engines?

1. Turboshaft
2. Turbojet
3. Turbofan
4. Turboprop

9

Turbo___ engine are most commonly used for helicopters

TurboSHAFT

10

Turbo___ engines are knows to be the noisiest

TurboJET

11

Turbo___ engines have better fuel consumption and reduced noise (80 percent bypass/20 percent core air)

TurboFAN

12

Turbo___ engines are prop-driven through a reduction gearbox from a turbine.

TurboPROP

13

The Pratt and Whitney Purepower 1000 is what TYPE of turbine engine?

GEARED TurboFan!

14

The ___ is designed to ensure smooth, stable airflow delivered to the compressor.

Air Intake

15

With regards to a Compressor, what does the term "Stage" refer to?

Stage = One set of rotors and stators within an axial flow compressor

16

Compressor EFFICIENCY is concerned with:

The amount of energy supplied from the turbine, via a shaft to the compressor resulting in an increase in pressure energy

17

____ are a collection of blades oriented around one cylindrical plane which rotates on the compressor shaft (driven by the turbine).

Rotors

18

____ are blades mounted to the compressors CASING

Stators
(Stators STAY, they do not move)

19

The ________ refers to the Amount of air routed around the compressor, versus the amount of air routed through the compressor/combustor

Bypass Ratio

20

High-Bypass ratio engines have a ratio greater than __

5

21

The air flow rate is the:

Volume of air able to be processed by the compressor (typically in 1 second)

22

What are the 2 TYPES of compressors?

1. Centrifugal Flow
2. Axial Flow

23

What type of compressor is most commonly used today?

Axial Flow Compressor

24

A(n) ____ flow compressor is able to accept large mass flow rates, and deliver high pressure ratios!

AXIAL flow

25

Can Axial Flow compressors be divided into multi-stage/multi-spool? What are 2 downsides of Axial Flow compressors?

- Yes
- Weight and Complexity (multiple stages/spools)

26

What are the 2 main types of COMBUSTION chambers?

1. Can-Type (inefficient, no longer used)
2. Annular

27

______ are distributed as necessary to provide fuel mist into the combustor

Fuel Nozzles

28

_____ operate as needed, and assist with starting, auto-continuous ignition, and manual-continuous ignition

Igniters

29

What is the purpose of a Turbine?

- To extract/absorb energy, and convert it from gas flow, into mechanical shaft power/torque

30

What 4 factors impact the number of stages a turbine engine has?

1. Number of compressor spools (to drive)
2. Amount of energy to extract from the gas
3. Rotational velocity (RPM)
4. Max permissible turbine diameter