Combined jet engine with RAM jet and turbojet

A jet engine, which comprises:

• a gas turbine located in the engine;
• peripheral ramjet channels located in the engine and outside said gas turbine and including burners wherein peripheral discharge channels are located in the engine and a gas circulation stream flow through the engine which is subdivided over part of the length of the stream into a central turbojet stream which flows through said gas turbine, and wherein said peripheral ramjet channels and said peripheral discharge channels terminate by issuing into a part of the gas circulation stream downstream of the turbine;
• a plurality of flaps located in the engine for opening and closing the central stream;
• a ring surrounding the central stream and extending in front of part of the peripheral discharge channels and the ramjet channels, and
• a motor for rotating the ring wherein the ring has a plurality of slots formed therein, the peripheral discharge channels and ramjet channels being arranged such that the slots of the ring successively pass, during rotation of the ring in a continuous direction, in front of the discharge channels only, then in front of none of the channels and then in front of the ramjet channels only.