CENTRIFUGAL IMPELLER AND TURBOMACHINE

摘要

A centrifugal turbomachine (1) comprises a casing (2); a rotor assembly (3) including at least one centrifugal impeller (10) for a fluid flowing from an inlet side (11) to an outlet side (12) of the impeller (10 and an eye seal (20) extending between an impeller eye (15) of the centrifugal impeller (10) and the casing (2) for preventing the fluid from leaking between the casing (2) and the centrifugal impeller (10); wherein the eye seal (20) comprises at least a first portion (21a) toward the inlet side (11) and a last portion (21e) toward the outlet side (12) of the impeller (10), the last portion (21e) being smaller in diameter than the first portion (21a).