Why is afterburner so loud?

Afterburner. The exhaust from a fighter in afterburner is leaving the engine at supersonic speed and creating shock waves. Even in military power (maximum without afterburner) the low bypass ratio engines in fighters have very high velocity exhaust, often supersonic, so very loud.

How much thrust does an afterburner add?

The idea behind an afterburner is to inject fuel directly into the exhaust stream and burn it using this remaining oxygen. This heats and expands the exhaust gases further, and can increase the thrust of a jet engine by 50\% or more.

Why is it called an afterburner?

An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Afterburning injects additional fuel into a combustor in the jet pipe behind (i.e., “after”) the turbine, “reheating” the exhaust gas.

Why do fighter jets rarely engage the afterburner?

It’s true that a fighter jet rarely engage the afterburner because it uses extreme amounts of fuel. Sometimes up to the factor 10 to the normal fuel useage.

What is an afterburner in an engine?

An afterburner is nothing but a set of fuel injectors, a tube and flame holder that the fuel burns in, and an adjustable nozzle. A jet engine with an afterburner needs an adjustable nozzle so that it can work both with the afterburners on and off. The disadvantage of an afterburner is that it uses a lot of fuel for the power it generates.

What is the difference between afterburner and turbojet?

A turbojet may be sub or super sonic and afterburner will almost always (but not necessarily in theory) produce supersonic outlet flow. In systems which do have supersonic exit exhaust velocities, as the flow changes from sonic at the nozzle throat to supersonic in the expansion system the aim is to make the exit pressure exactly match ambient.

What is the maximum thrust a jet can produce with afterburner?

Maximum thrust with afterburner 15,660 daN (each 7’830 daN) Some airplanes need the afterburner to reach supersonic speed because the “normal” use of the jet turbine doesn’t generate enough thrust. Using the turbine in “normal” mode (without afterburner) is also called “military power” or “dry”.