Patent
Active tip clearance control for shrouded gas turbine blades and related method
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TLDR
A turbine bucket tip clearance control system as discussed by the authors includes a rotor assembly having a rotor supporting a plurality of axially spaced wheels, each wheel mounting an annular row of buckets, each bucket on at least one of the axially-spaced wheels having a radially outer tip shroud provided with at least 1 seal tooth.Abstract:
A turbine bucket tip clearance control system includes a rotor assembly having a rotor supporting a plurality of axially spaced wheels, each wheel mounting an annular row of buckets, the annular row of buckets on at least one of the plurality of axially-spaced wheels having a radially outer tip shroud provided with at least one seal tooth. A stator assembly includes a radially inwardly facing, axially-stepped surface, formed with radially inner and outer seal surfaces connected by a shoulder. The stator assembly and rotor assembly are moveable axially relative to each other, enabling selective positioning of the at least one seal tooth radially opposite one of the radially inner and outer seal surfaces to thereby selectively alter a clearance gap between the at least one seal tooth and the radially inward facing axially-stepped surface.read more
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Patent
Gas turbine engine with fan clearance control
TL;DR: In this paper, a gas turbine engine is described with a fan rotor with a plurality of blades and an outer fan housing surrounding the plurality of rotor blades, where a tip clearance is defined between a radially outer tip of the blades and a radial inner surface of the fan housing.
Patent
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Proceedings ArticleDOI
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References
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Patent
Elastic fluid turbine
Glenn B Warren,Harrison L Wirt +1 more
TL;DR: In this paper, the present invention relates to elastic fluid turbines, more specifically to turbine arrangements from which elastic fluid is tapped or extracted from the last stages of the turbine, that is, ahead of the last bucket wheel as regards the direction of flow through the turbine.
Patent
Removable inner turbine shell with bucket tip clearance control
Brendan Francis Sexton,Hans Milton Knuijt,Sacheverel Quentin Eldrid,Albert Myers,Kyle Ethan Coneybeer,David Martin Johnson,Iain Robertson Kellock +6 more
TL;DR: In this article, a turbine includes a plurality of inner shell sections mounting first and second stage nozzle and shroud portions to enable thermal expansion and contraction of the inner shell relative to the outer shell.
Patent
Gas turbine engine blade tip clearance apparatus and method
TL;DR: A zero running clearance system for gas turbine engines is defined in this paper, which includes a gas turbine engine compressor (14) having one or more first rotor assemblies (30) and one of the first stator assemblies (28) disposed adjacent to the one or multiple first rotor assembly (30; 104); and an actuator (58) selectively operable to axially move the first and second rotor assemblies to alter the clearance distance.
Patent
Turbomachine with active tip-clearance control
TL;DR: In this article, an electromagnetic actuator on the case (12) magnetically attracts a thrust plate (94) on the rotor (44) against a net dynamic force produced by the rotor during the operation of the turbomachine (10), and a control system (118) of the actuator (100) controls the magnetic attraction in response to signals from a position sensor (116) measuring the actual magnitude of the clearance gap (62), so as to maintain the actual clearance gap at a predetermined magnitude.
Patent
Tip clearance control apparatus for a turbo-machine blade
TL;DR: In this article, an apparatus for controlling rotating blade tip clearance in a turbo-machine utilizing conical tipped blades is presented, which consists of an approximately conical blade ring mounted for axially sliding displacement in the turbo machine cylinder.