For a while now i've had this nagging need to produce a small scale device capable of producing and demonstrating Shock Diamonds. No interest in efficiency or using it for propulsion or anything. I really just want people to be able to see shock diamonds up close and safely.
doubtful, only high explosives by definition can produce a supersonic shockwave. Diamonds only occur for supersonic exhaust. The thing is any high explosive wouldn't be able to sustain a stream, it would destroy the engine and create, at best, a split second jet.
You would likely need to do it using jet engine principles, even if rudimentary in nature.
@L29Ah As I understand it that would only work with a pulse engine, which can be supersonic but wont produce diamonds without tuning the pulse frequency, even then might not... not really sure if or how pulse engines could produce diamonds as it usually requires a constant exhaust velocity.
Generally to create a constant supersonic stream youd need a compressor feeding the reaction chamber. At sufficient pressures fuels that are not normally capable of detonation like gasoline (which typically only deflagerates) will engage in detonation. Though jet fuel would require less pressure.
So I think the easiest design would involve a fairly enriched fuel source on the order of jet fuel plus a pressurized combustion chamber.