HOW IT WORKS ?

• Principle :

It's thanks to Huygens that one owes the discovery of a basis phenomenon used in pulsejet engines : a capacity suddenly open empties himself beyond the balance with the outside environment and settles transitorily in depression. The combustion chamber of the pulsejet engine uses this effect of depression assuring its successive replenishments and a combustion roughly to constant volume.

Therefore the combustion in a pulsejet is like the one of a two stroke piston engine , rather than to the one of a turbojet where it is continuous.

 

• Induction :

To the starting up, one injects the compressed air (4 to 8 bars according to engine); fuel is sprayed thus through valves and penetrate in the combustion chamber .

• Explosion :

The first explosions are achieved thanks to a candle and an high tension ignition (Roumkoff's coil + vibrator). At the time of the mixture explosion, the volume triple, this increase of pressure has the effect of to close valves. The burnt gases can escape only toward the rear, creating so the thrust.

The following explosions are maintained by the contact of the mixture on the hot partitions and the candle becomes therefore obsolete. (It is the reason for which one uses for the ignition, a removable candle that one introduces by the nozzle to the starting)

 

• Re-Induction :

The hot gas exhaust creates a depression in the combustion chamber . This pressure becomes lower to the external pressure, valves open up, fuel penetrates in the room, ignite to the hot partition contact and... a new cycle begins! This to a frequency of 200 to 300 times per second what explains the deep tone of this type of engine.