Turbocharger having two turbine wheels

The turbine (10), comprising a housing (14) with an inner cylindrical chamber (16), has a transverse partition (34) dividing the chamber into two compartments. The first compartment (36) contains the first turbine rotor (40) and a wall with a first inlet (26) and outlet (30). The second compartment (38) contains a second turbine rotor (46) and has an inner wall (48) with a second inlet (28) and outlet (32). The two rotors are mounted on the same axial shaft (12) that passes through the partition.