Seal for a turbomachine

A seal configured to provide a predefined clearance between said seal and an outer surface of a rotor mounted rotatably about an axis A disposed opposite the seal, the axis A defining an axial direction, the seal extending circumferentially around the axis A and comprising a plurality of seal segments circumferentially distributed around the axis A, each seal segment comprising an inner ring segment connected to an outer ring segment by a return member,

• the seal being characterized in that the inner surface of each inner ring segment comprises a plurality of patterns hollowed out from the inner surface of the inner ring segment, the plurality of patterns comprising at least:
• a first pattern having a longilineal shape extending along a diagonal direction with respect to the axial direction from the upstream edge of the inner ring segment and all the way to a first non-hollowed-out portion of the inner surface of the inner ring segment;
• and
• a second pattern comprising a first part extending along the same diagonal direction as the first pattern from the upstream edge of the inner ring segment and all the way to a second non-hollowed-out portion of the inner surface of the inner ring segment axially closer to the downstream edge of the inner ring segment than the first non-hollowed-out portion, the first part of the second pattern being separated in the circumferential direction from the first pattern by a third non-hollowed-out-portion of the inner surface of the inner ring segment, the second pattern further comprising a second part extending along the circumferential direction between the first non-hollowed-out portion and the second non-hollowed-out portion of the inner surface of the inner ring segment.