Jet engine

A jet engine comprising:

• a fan provided with a plurality of stages of rotor blades;
• a compressor which compresses air which is sent from the fan;
• a combustor which generates combustion gas by using compressed air generated by the compressor;
• a turbine which generates a driving force from the combustion gas;
• a nozzle which discharges the combustion gas;
• a cylindrical casing accommodating the fan, the compressor, the combustor, and the turbine;
• a core channel and a bypass channel which are radially divided parts of an inside of the casing downstream of the fan;
• a variable guide vane disposed upstream of the rotor blades of a third and later stage and downstream of the rotor blades of a first stage and second stage of the rotor blades of the fan and configured to adjust an inlet angle of airflow against the third and later stage of the rotor blades;
• and
• a movable portion comprising:
• flaps arranged in a circumferential direction of the nozzle;
• and an actuator adjusting an angle of the flaps, and configured to adjust a fluid resistance at the nozzle,
• wherein no branch of the airflow is provided at intermediate stages of the fan.