Inlet nozzle assembly and turbomachine with an impeller and an inlet nozzle assembly

An inlet nozzle assembly for suction-side arrangement on an impeller rotatable about a rotation axis, comprising:

• a front end section and an adjoining casing section,
• wherein the casing section has a circumferential wall surrounding the rotation axis, which forms a receiving space for receiving the impeller, so that a radial gap is formed in the radial direction between the circumferential wall and a radially outer end section of the impeller,
• and wherein the front end section has a front end wall with an inlet nozzle which extends into the receiving space,
• wherein an axial gap is formed in the front end section between the front end wall and an end face of the impeller,
• wherein radial ribs extend from the circumferential wall into the receiving space, which are configured to reduce the radial gap,
• or that axial ribs extend from the end wall to the receiving space, which are configured to reduce the axial gap,
• wherein the impeller rotatable about the rotation axis has impeller blades and a cover plate configured to delimit the impeller blades in an axial direction,
• wherein the receiving space is configured to completely receive the cover plate, so that the radial gap is formed in the radial direction between the circumferential wall and the cover plate,
• and wherein the axial gap is formed in the front end section between the front end wall and the cover plate;
• and wherein the front end wall of the front end section extends radially into the receiving space.