Direct Answer
A Rotating Detonation Engine (RDE) is an advanced propulsion system that utilizes continuous supersonic detonation waves to achieve higher thermodynamic efficiency than conventional deflagration engines
PDE (Pulsed)
Straight tube
Intermittent burnRDE (Rotating)
Annular chamber
Continuous supersonic wave
Straight tube
Intermittent burnRDE (Rotating)
Annular chamber
Continuous supersonic wave