Turbine having a shroud ring around the rotor blades and a method of limiting leakage of working fluid in a turbine

摘要

A gas (or steam) turbine (200) comprising a rotor having at least one array of rotor blades (213-1), a stator having a casing (261), and a shroud ring (250) is disclosed; A shroud ring 250 extends around the array of rotor blades 213 - 1 , and a casing 261 extends around the shroud ring 250 . The shroud ring 250 has a radial size independent of temperature due to its material, and is movably coupled with the casing 261 so that the casing 261 of the stator is maintained during operation of the turbine while maintaining the shroud ring radial size. Allows thermal expansion and contraction. The rotor also thermally expands and contracts during operation of the turbine, and at operating temperature, the tip area of the rotor blade 213 - 1 is close to the inner area of the shroud ring 250 such that the clearance is small or even zero in operating conditions. very close