Oblique Wave Detonation Engine May Unlock Mach 17 Aircraft

schwit1 shares a report from New Atlas: UCF researchers say they've trapped a sustained explosive detonation, fixed in place, for the first time, channeling its enormous power into thrust in a new oblique wave detonation engine that could propel an aircraft up to 17 times the speed of sound, potentially beating the scramjet as a hypersonic propulsion method. Rotating detonation engines, in which the shockwaves from one detonation are tuned to trigger further detonations within a ring-shaped channel, were thought of as impossible to build right up until researchers at the University of Central Florida (UCF) went ahead and demonstrated a prototype last year in sustained operation. Due for testing in a rocket launch by around 2025, rotating detonation engines should be more efficient than pulse detonation engines simply because the combustion chamber doesn't need to be cleared out between detonations.

Now, another team from UCF, including some of the same researchers that built the rotating detonation engine last year, says it's managed a world-first demonstration of an elusive third type of detonation engine that could out-punch them all, theoretically opening up a pathway to aircraft flying at speeds up to 13,000 mph (21,000 km/h), or 17 times the speedThe UCF team claims it has successfully stabilized a detonation wave under hypersonic flow conditions, keeping it in place rather than having it move upstream (where it could cause the fuel source to explode) or downstream (where it would lose its explosive advantage and fizzle out into a deflagration). Where a detonation typically lasts only a matter of micro- or milliseconds, the UCF team managed to sustain this one experimentally until the fuel was turned off after around three seconds. That's long enough to prove the device works. The paper is open-access at PNAS.

Read more of this story at Slashdot.