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biggsteve81 t1_j68if9c wrote

Reply to comment by n4rf in ELI5: What is the difference between turbojet, ramjet, and scramjet? by Global_Maize_8944

True turbojet engines don't have any bypass ratio at all. Even a low-bypass jet engine is still a turbofan engine, not a true turbojet.

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n4rf t1_j68mou7 wrote

Fair point. they usually do have bleed or bypass channels but that's a technicality.

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Dysan27 t1_j68y2r0 wrote

Those are ususaly to prevent damage due to too high pressure/temperature.

In a turbo fan there is air that is deliberately bypassed with the intention of adding to thrust.

One way to look at turbofans is that they are turbojets with an additional fan on the front to accelerate more air. So the point of the turbojet is now not to accelerate the air, but to power the fan that accelerates the air.

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