Arrangement for internal passive turbine blade tip clearance control in a high pressure turbine

摘要

A passive internal control system for rotor blade tip clearance of a high-pressure turbine is based on inner rings that expand in a radial direction under the influence of heat and radially adjust the clearance delimited by liner segments (9) on the casing side. It comprises a radially expandable U-shaped downstream inner ring (10) mounted to inner platforms (7b) of guide vanes (7) on a side where the rotor does not have a static bearing, said ring providing expansion compensation in the axial and peripheral directions and forming a torsion box (8) with struts (13, 14) that absorbs rolling and tilting moments.