On 02/06/2023 17.49, Dave Collier-Brown via talk wrote:
The diffuser cone should actually be a catenoid, with a diameter and length based on the RPM range you're after.
There was a lovely little demo two-stroke at the National Engineering Laboratory in Scotland that had its diffuser shaped such that the sonic wave provided enough reflected back pressure that it didn't need valves. It was (of course) single speed and fearsomely inefficient, but it could run (kinda)
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