Rotary kinetic fluid motors or pumps – With passage in blade – vane – shaft or rotary distributor...
Patent
1998-11-23
2000-10-03
Ryznic, John E.
Rotary kinetic fluid motors or pumps
With passage in blade, vane, shaft or rotary distributor...
415178, 415116, 415176, F01D 514, F03B 1100
Patent
active
061263907
ABSTRACT:
A passive clearance control system is provided in the turbine section of a gas turbine engine in which turbine casing nozzle vanes and rotor blades are provided. The rotor blades are arranged on a rotor and preferably fitted with a shroud. The tips of the blades or shroud are surrounded by shroud segments suspended in the turbine casing, and a clearance between the tips and the shroud segments is formed and has a width which is controlled by a heating-cooling channel system. The channel system is supplied with a stream of air from the compressor section of the gas turbine and bypasses the combustion chamber to reach, via a plurality of metering holes, an annulus bounded by a stator ring. In a preferred aspect of the present invention, a ring-shaped orifice plate interacting with the metering holes is provided within the annulus which closes these metering holes to a varying degree depending on the temperature of the air stream reaching the heating-cooling channel system. A fraction of the hot gas flowing across the nozzle vanes and rotor blades is allowed to reach the annulus via a clearance between the stator ring and the stator shroud segments at least at a low turbine load.
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Rolls-Royce Deutschland GmbH
Ryznic John E.
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