Transpiration clearance control turbine
AssigneeGeneral Electric Company
InventorsKenneth Edward Seitzer, Wojciech Sak, Zhifeng Dong, Robert Paul Ziegler, William Lee Herron
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Abstract
A row of turbine blades is surrounded by a turbine shroud. The shroud is supported by a turbine case having a pair of radially outwardly extending rails. The rails are perforate for channeling therethrough control air to control thermal radial movement of the case, and in turn radial position of the shroud supported therefrom.
Claims28
A turbine comprising:
- a row of turbine blades extending radially outwardly from a rotor disk;
- a turbine shroud surrounding said row of blades;
- a turbine case having radially inwardly projecting hooks supporting a hanger in turn supporting said shroud;
- said case including a pair of control rails extending radially outwardly above said hooks;
- and
- said rails are perforate for channeling therethrough pressurized control air to control thermal radial movement of said case at said hooks, and in turn radial position of said shroud.
A system for controlling radial clearance between a turbine shroud and a row of turbine blades in a gas turbine engine, comprising:
- a turbine case having radially inwardly projecting hooks for supporting said shroud, and a pair of rails extending radially outwardly above said hooks;
- and
- said rails are perforate for channeling therethrough pressurized air to control thermal radial movement of said case at said hooks, and in turn radial position of said shroud.
A method for controlling radial clearance between a turbine shroud and row of turbine blades in a gas turbine engine, comprising:
- supplying pressurized control air to a turbine case supporting said shroud;
- and
- channeling said air through transpiration holes in control rails extending radially outwardly from said case to control radial thermal movement of said case, and in turn controlling said radial clearance.
Dependencies are inferred from the claim text.