Principle operation of the Pulse Detonation Engine is that of the pulse jet engine. In the beat jet, air is mixed with fuel to generate a flammable mixture that may be then ignited in a open chamber. The resulting combustion greatly boosts the pressure of mixture to somewhere around 100 atmospheres (10 MPa), which then expands through a nozzle for forced. A pulse detonation engine is a type of propulsion system that uses detonation waves to combust the fuel and oxidizer mixture.