A device for controlling the flow in a turbomachine, preferably a centrifugal compressor, wherein said device comprises: - a plurality of fixed blades; - a plurality of adjustable blades, said plurality of adjustable blades being arranged, in use, downstream said plurality of fixed blades so that each of said adjustable blades has an aerodynamic interaction with one of said fixed blades; and wherein: each of said adjustable blades is pivotable about a fixed axis to rotate, with respect to a reference orientation, between a minimum angle and a maximum angle; each of said adjustable blades is configured to deliver a substantially deswirled flow when the blade is at said reference orientation; characterised in that for each of said adjustable blades, said fixed axis is substantially located at a center of pressure of the blade, for each of said adjustable blades, said center of pressure is evaluated when the blade is at said reference orientation; and in that said fixed blades and said adjustable blades are designed and arranged so that, in use, aerodynamic interaction between them is such as to generate a Coanda effect; wherein said adjustable blades are disposed in such a way that such aerodynamic interaction is maximized when said adjustable blades provide negative swirl. - a plurality of fixed blades; - a plurality of adjustable blades, said plurality of adjustable blades being arranged, in use, downstream said plurality of fixed blades so that each of said adjustable blades has an aerodynamic interaction with one of said fixed blades; and wherein: each of said adjustable blades is pivotable about a fixed axis to rotate, with respect to a reference orientation, between a minimum angle and a maximum angle; each of said adjustable blades is configured to deliver a substantially deswirled flow when the blade is at said reference orientation; characterised in that for each of said adjustable blades, said fixed axis is substantially located at a center of pressure of the blade, for each of said adjustable blades, said center of pressure is evaluated when the blade is at said reference orientation; and in that said fixed blades and said adjustable blades are designed and arranged so that, in use, aerodynamic interaction between them is such as to generate a Coanda effect; wherein said adjustable blades are disposed in such a way that such aerodynamic interaction is maximized when said adjustable blades provide negative swirl. each of said adjustable blades is pivotable about a fixed axis to rotate, with respect to a reference orientation, between a minimum angle and a maximum angle; each of said adjustable blades is configured to deliver a substantially deswirled flow when the blade is at said reference orientation; characterised in that for each of said adjustable blades, said fixed axis is substantially located at a center of pressure of the blade, for each of said adjustable blades, said center of pressure is evaluated when the blade is at said reference orientation; and in that said fixed blades and said adjustable blades are designed and arranged so that, in use, aerodynamic interaction between them is such as to generate a Coanda effect; wherein said adjustable blades are disposed in such a way that such aerodynamic interaction is maximized when said adjustable blades provide negative swirl.