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Beginner's Guide to Propulsion
Turbojet Thrust

Answers will vary. Suggested answers are shown below:


1. What is another name for a jet engine? gas turbine engine

2. In the Turbojet Thrust diagram, the free stream air enters which engine part first? inlet

3. The air then flows into the compressor.

4. A compressor acts like rows of airfoils.

5. A compressor also acts like an electric fan.

6. Where is the best place to direct the air to make it turn? the center

7. What happens to the pinwheel? it spins

8. What happens to the movement of the pinwheel when the fan is turned off? it stops

9. What happens to the movement of the pinwheel when the fan is turned to a higher speed? it spins at a faster speed

10. Describe what you feel. air pushes against it

11. Write a sentence describing what the compressor does to the air in a turbojet. The compressor has tiny airfoils in it which turn as air flows through it and this results in an increased pressure.

12. Describe what happens in the burner. What is the ratio between fuel and air? 2 pounds of fuel is combined with every 100 pounds of air and is ignited

13. How is the action of the turbine like the action of your pinwheel? both have blades that create spin as air flows across them

14. Comparing the pinwheel to the turbine, what do you think happens to the speed at which the turbine spins as the speed of the air increases? the turbine will also spin faster

15. Trace the flow of air through the turbojet engine by listing its components in order. inlet, compressor, burner, turbine, nozzle

16. What important result is created by each of the following things happening?

turbine turns provides power to turn the compressor

compressor turns provides air at high pressure to the burner

hot gases leave the engine provides thrust to send the jet plane forward

fuel is burned adds energy to the gases to create thrust

Related Pages:
Propulsion Activity Index
Propulsion Index


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Editor: Tom Benson
NASA Official: Tom Benson
Last Updated: Thu, Jun 12 04:39:29 PM EDT 2014

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