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A jet engine that uses ram pressure to compress incoming air, and where the airflow throughout the entire engine is at supersonic speeds.
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Is the compressor required on jet engines? Can air be rammed into the turbine?
Actually neither the ramjet nor the scramjet have a fan, they are pure reaction engines.
Ramjet
The first engines to operate on this principle is the ramjet. … This engine is known as scramjet. It works at higher speeds than a ramjet.
Scramjet principle, Wikipedia
Need a little help
However no ramjet, and even less a scramjet, can produce static thrust. …