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>It would still require moving parts though (unless it's only used as a ramjet), since a jet engine has to compress the air before heating it.

You could use a tesla valve for an electric pulse jet, that would make for no moving parts.

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I hadn't considered that, that's a good idea.

Why do you need a tesla valve? Has anyone tried this?

You need something to make sure the hot air only comes out one end of the engine, otherwise you get net zero thrust. In a normal jet the compressor takes care of this.

You don't strictly need one. There are designs that rely on exhaust pulse resonance for pressure. There are designs that use various kinds of mechanical valves.

It looks like (propane fuel) tesla valve pulse jets have been built, but I'm not seeing anything flight capable.

https://www.youtube.com/watch?v=JYZhZ_qNKfE

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