“A rotating detonation engine (RDE) is an engine using a form of pressure gain combustion, where one or more detonations continuously travel around an annular channel. Computational simulations and experimental results have shown that the RDE has potential in transport and other applications.”
https://en.wikipedia.org/wiki/Rotating_detonation_engine
https://www.youtube.com/watch?v=Ws4kbgfpKCw
Much more useful.