Rotor for a centrifugal separator and centrifugal separator

A rotor of a centrifugal separator, comprising:

• a central shaft;
• a disc stack made up of a plurality of identical discs arranged on the central shaft,
• the central shaft having on an outer circumference an engagement contour for a rotationally fixed, axially slidable engagement with a corresponding contour on an inner circumference of the discs of the disc stack, the engagement contour and the corresponding contour being capable of being brought into engagement with one another in a plurality of rotational positions at a distance from one another in a rotor circumferential direction, and
• each disc having spacing elements situated at a distance from one another in a disc circumferential direction, which spacing elements hold each two adjacent discs at an axial distance from one another, forming an intermediate flow gap having a specifiable gap dimension,
• wherein the spacing elements of the discs are formed and configured such that, via different rotational positions relative to one another of adjacent discs in the disc stack, at least two different axial spacings having different gap dimensions of the flow gap between the adjacent discs are capable of being set.