Centrifugal separator

A centrifugal separator (10) comprising a housing (12), which extends along a central axis (14) and has a separating chamber wall (24) for delimiting a separating chamber (26) that is fed by an inlet channel (44) for polyphasic fluid, wherein a central immersion tube (50) is provided for discharging a first fluid phase and an outlet channel (54) is provided for discharging a second fluid phase, wherein an expansion chamber (30), which widens radially outward with respect to the separating chamber (26) and is radially outwardly delimited by an expansion chamber wall (32), is provided between the separating chamber (26) and the outlet channel (54), wherein the separating chamber (26) conically widens from the inlet channel (44), as seen along the central axis (14), toward the expansion chamber (30), wherein a diameter (42) of the expansion chamber (30) measured perpendicularly to the central axis (14) is larger than a largest diameter (34) of the separating chamber (26) measured perpendicular to the central axis (14), wherein the separating chamber (26) opens at an annular transition region (38) into an annular-disk-shaped boundary portion (40) covering the expansion chamber (30), wherein the annular transition region (38) between an end of the separating chamber wall (24) and the boundary portion (40) covering the expansion chamber (30) is sharp-edged or rounded, and wherein the outlet channel (54) has an outer boundary wall (56) with respect to the central axis (14), which tangentially adjoins a portion (58) of the expansion chamber wall (32).