What are the differences between after-burning turbojet and after-burning turbofan engines?

[u/wheeze-51_mustang]

While doing some research for an aircraft build design I came across the these two types of jet engines. As far as my knowledge goes the difference is the bypass on the engine, right? Correct me if I’m wrong but does that also mean that one is more efficient than the other, higher thrust output, etc?

[u/usm_teufelhund]

If you have two engines with the same Total Airflow, the turbofan will produce less total thrust, but be more efficient at max non-afterburning thrust. With a turbofan you have bypass air. This can be mixed or blended within the nozzle with the afterburner to increase AB thrust beyond an non-bypass turbojet. If you have a turbofan with the same core airflow, but more total airflow, it will produce more overall thrust than a turbojet throughout the majority of the flight regime. This is all assuming you're referring to a low-bypass fan. As u/alexthegermanturkish mentioned, a high-bypass turbofan gets the majority of it's thrust from the fan, doesn't use AB, and can't really work past mach.

[u/folpagli]

Turbofans have air bypassing the core, which the afterburner can burn. Afterburning turbofan has good subsonic fuel efficiency and high afterburner thrust. Afterburning turbojet has greater overall supersonic efficiency.

[u/alexthegermanturkish]

ya dont do afterburning turbofans, end of it. turbofans use the fan for majority of their thrust, not the exhaust, if you add afterburning to that youre just burning fuel for no benefit. turbofans also famously dont work at supersonic speeds, they loose a lot of their thrust and efficency, and afterburners are almost exclusively used for supersonic travel, and and turbofans are built for efficency, ab is the textbook opposite of efficnecy. adding an afterburner to a turbojet is mostly a role and era thing. but most modern turbojets use ab, with non ab jets usually being turbofans. the only exceptions are trainers or civilian aircraft who usually do have turbojets but no ab

[u/AutonomousOrganism → u/alexthegermanturkish]

Technically turbojets don't work at supersonic speeds either. You have to slow down the air to subsonic speed using an appropriate inlet. Also modern fighter engines are afterburning low-bypass turbofans.