Turbo engine with noise reduction

, Turbo machine with a flow-through annular main flow duct (1), in which at least one with stator blades (2)-provided stator is arranged, characterized in that the stator blades (2) each have at least one recess (6) which in a flow passage (7) inside of the stator blades (2), and in that the flow channel (7) in at least one provided with a shut-off (8) discharge channel (9) in a bypass duct (10) of the turbomachine opens