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Afterburners are special devices fitted between the turbine and the nozzle of some turbojets and turbofans let the thrust become especially strong for short bursts of time. When the combusted mixture is about the enter the nozzle, a lot of the concentration is still oxygen. Inside the afterburner, more fuel is mixed, increasing the fuel concentration. When this new mixture is burned, much higher temperatures are reached and the thrust becomes much stronger. Afterburners consume a lot of fuel, so an "afterburn" only lasts for a short period of time.
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