Mixing device and turbofan engine with such a mixing device

The invention relates to a mixing device and a turbofan engine with such a mixing device (30) for mixing a first gas stream (50) with a second gas stream (40) in a turbofan engine (20), with an actuating device (95) and a wall (60) which defines a radially inner channel (65) for the first gas stream (50) and a radially outer channel (70) for the second gas stream (40), wherein the actuating device (95) comprises a coupling element (110) which is coupled with the wall (60), wherein the actuating device (95) is configured to pivot the wall (60) by means of the coupling element (110) from a first position to a second position arranged radially outward from the first position, wherein the actuating device (95) comprises a control ring (105) which is rotatable in the circumferential direction between a first rotational position and a second rotational position and is connected to the coupling element (110), wherein the coupling element (110) is configured rigidly and is coupled with the control ring (105) in such a manner that by a rotation of the control ring (105) between the first rotational position and the second rotational position, the wall (60) is pivoted by the coupling element (110) between the first position and the second position correspondingly to the rotation of the control ring (105).