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## How Jet Engines Work

1. Use the Internet to find the function of the main parts of a jet engine and complete the table of jet engine parts shown below.
(See http://www.grc.nasa.gov/WWW/K-12/airplane/turbparts.html )

## Fan

Accelerates air into the jet engine.

Fans are used for efficiency.

## By-pass Duct

Air flows through the inlet through a duct and out the nozzle. The air leaves the engine at a higher velocity than when it entered. The passage through which the air travels is called the by-pass duct.

## Compressor

Consists of multiple rows of blades which turn and make the air denser.

## Combustor

The compressed air flows into the combustor where a spray of fuel is added and ignited.

## Turbine

The fast moving air causes the blades of the turbine to turn, generating energy which is used to power other parts of the engine.

## Nozzle

Air leaves the engine through the nozzle where exhause pressure is matched with atmospheric pressure.

2. Name the four main types of gas turbines (http://www.grc.nasa.gov/WWW/K-12/airplane/trbtyp.html) demonstrated below and give their functions.

### MAIN APPLICATION OF ENGINE

Turbojet

Airliners and military aircraft

Turbo fan

### Most common type used in civil and military aircraft

Turbo prop

Military aircraft

Turbo shaft

Helicopters, power and pumping stations, hovercraft, and ships

3. The reaction produced by a jet engine is based on Newton's Third law of motion.

4. Explain Newton's law of motion referred to in Question 3.

For every action, there is an equal and opposite reaction.

5. Give two examples of applications of Newton's law of motion other than jet engines.

Answers will vary. Examples: a bouncing ball or one marble striking another marble.

Related Pages:
Standards
Activity
Worksheet

Propulsion Activity Index
Propulsion Index

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