THEORETICAL FOUNDATIONS OF ROTATING DETONATION ENGINES

What if an engine didn't just burn fuel, but exploded it thousands of times per second? Standard jet engines rely on deflagration—subsonic burning at constant pressure. Rotating Detonation Engines, or RDEs, rewrite these rules using Pressure Gain Combustion. Instead of a controlled flame, an RDE ignites fuel using continuous supersonic shockwaves traveling at up to Mach 6 inside an annular ring. By switching from the traditional Brayton cycle to the constant-volume Humphrey cycle, RDEs boost thermal efficiency by up to 25 percent while eliminating complex moving parts. Fresh propellant enters the base, feeding a self-sustaining detonation wave that sweeps around the combustor and blasts supersonic exhaust out the nozzle. The challenge? Thermal loads exceeding 10 megawatts per square meter—hot enough to vaporize standard engine alloys. Controlling these hypersonic shock fronts is the key to unlocking the next era of aerospace propulsion.