Ramjet Engine

A ramjet, sometimes referred to as a flying stovepipe, or an athodyd which is an abbreviation of Aero thermodynamic duct, is a form of airbreathing jet engine using the engine's forward motion to compress incoming air, without a rotary compressor.
Key Points:-
>Ramjets cannot produce thrust at zero airspeed, thus they cannot move an aircraft from a standstill.>Ramjets can be particularly useful  in applications requiring a small and simple mechanism for high-speed use, such as missiles or artillery shells.
Working:-
Jet engines and rocket engines all  work pretty much like the balloon drawing at the right. Pressurized gasses inside the balloon push equally in all directions. Forces trying to push the balloon in one direction are canceled by equal but opposite forces trying to move it in the  opposite direction.Ramjet engines work in exactly this way. The combustion chamber is closed except for an opening at the exhaust nozzle. Burning fuel produces high pressure gasses that escape through the nozzle at the rear at a high velocity which much greater than that of incoming velocity of air and thus engine pushes the engine forward.