PULSEJET
EXOTIC PROPULSION DESIGN
Pulsejets use the forward speed of the engine and the inlet shape
to compress the incoming air, then shutters at the inlet close while
fuel is ignited in the combustion chamber and the pressure of the
expanding gasses force the jet forward. The shutters then open and
the process starts again at a high frequency. This results in the
buzzing drone for which the experimental pulsejet missile is named
the "BuzzBomb". People have pointed out that pulsejets can be cooled
which would solve the heating problem of the ramjets. They could
also, theoretically, generate "donut-on-a-rope" contrails due to
the engine's operational design.
The known advantages of the Pulsejet engine are:
- Theoretically it has a higher fuel efficency than a normal engine
that keeps constant pressure.
- Engines can be produced in many sizes with many different thrust
ouputs ranging from a few pounds to thousands of pounds.
- They have a very high thrust-to-weight ratio, which means a
lighter engine producing more pounds of thrust than it's weight.
- They are mechanically very simple and have very little moving
parts.
- They do not depend on the oxygen in the atmosphere to provide
as an oxidizer, which means it could go in or out of the atmosphere
