Turbo jet engine

The turbojet engine (1) has a double-tube structure with an inner flow channel (14) and an outer flow channel (12) shrouding it. The main flow (11) is passed into the outer channel (12) with an auxiliary flow (13) into the inner channel (14). The inner channel (14) is formed by a hollow shaft (10), open at both ends. The gap between the end of the inner flow channel (14) and the jet thrust plane (16) is pref. 10-25% of the jet diameter at the jet thrust plane. The auxiliary flow is 5-20% of the main jet mass flow, and pref. 5-10%.