Guide to Propulsion
will vary. Suggested answers are shown below:
1. What is
another name for a jet engine? gas turbine
2. In the Turbojet
Thrust diagram, the free stream air enters which engine part first?
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
7. What happens
to the pinwheel? it spins
8. What happens
to the movement of the pinwheel when the fan is turned off? it
9. What happens
to the movement of the pinwheel when the fan is turned to a higher speed?
it spins at a faster speed
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.
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
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?
provides power to turn the compressor
provides air at high pressure to the burner
hot gases leave
the engine provides thrust to send the jet
fuel is burned adds
energy to the gases to create thrust