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Is this not... a propeller? A turboprop engine?

>>direwo+(OP)
I’m not an expert but I think the distinction is that the blade tips in these reach supersonic speeds like in turbofans. That is a hard problem to fix because you don’t have the duct to contain the noise and catch the blades if one were to break.

>>idontw+u9
> the distinction is that the blade tips in these reach supersonic speeds like in turbofans

Commercial engines are not designed to have anything to supersonic.

>>JumpCr+fF
https://aviation.stackexchange.com/questions/22316/why-do-tu...

>>idontw+xI
Sorry, you’re correct. You want to avoid supersonic tips as much as possible.

Modern turbofans permit supersonic tips during high-thrust regimes. (Part of the work in these new designs is releasing that constraint since those supersonic tips are a bastard.) It’s something sought to be avoided. But not at all costs at all times.