Bloom mixer for a turbofan engine

An adjustable bloom mixer for a turbofan engine for setting a mixing ratio, adapted to the respective flight condition, between a cold airflow from a bypass duct and a hot airflow from a core flow duct, comprising:

• a bloom mixer having a rotationally symmetrical part and a thin-walled, corrugated part' an inner surface and an outer surface;
• an air-guiding element arranged upstream of the thin-walled, corrugated part for branching off at least one of a group consisting of a cold partial airflow from the bypass duct and a hot airflow from a core flow duct of the engine;
• an air control device downstream of the air-guiding element for leading the at least one of the branched-off cold partial airflow or hot airflow along at least one of the inner surface and the outer surface of the bloom mixer to deflect the corrugated part radially inwards or outwards due to one of thermal contraction and thermal expansion resulting from a temperature difference between the inner surface and the outer surface effected by the at least one of the cold partial airflow and the hot airflow.