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 ( 7 b) 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.