Difference between scramjet and jet engine.The main difference is that the scramjet does not contain any moving parts like compressor blades, turbine blades etc. Also in scramjet there is no compression to subsonic velocities.In a jet engine compression and combustion process occurs at subsonic velocities.Thus combustion efficiency will be better in jet engines.In a jet engine a compressor for compression,combustion chambers for compression and turbines to run the compressors.The main difference is that in a scramjet engine all the processes like compression,combustion and exhaust takes place at supersonic velocities.But there are no moving parts in a scramjet engine.A scramjet engine consisted of only a constricted tube.Thus chances for mechanical failures due to moving parts are avoided.The differences are clearly shown in the diagram released by NASA.
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