Ceramic radial flow turbine heat shield with turbine tip seal

Details Ceramic radial flow turbine heat shield with turbine tip seal Ceramic radial flow turbine heat shield with turbine tip seal

1999-08-13

2000-12-05

Look, Edward K.

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade edge and static part

4151734, 4151736, 415178, F01D 1108

Patent

active

061557803

ABSTRACT:
A turbine engine includes a rotatable turbine having a peripheral tip and a backface. A heat shield is positioned adjacent the backface and includes an integral ring extending from a peripheral edge of the heat shield to a position spaced radially outwardly from the peripheral tip of the rotatable turbine to form a tip clearance between the ring and the peripheral tip. The turbine comprises a material having a coefficient of thermal expansion at least approximately four times greater than the coefficient of thermal expansion of the heat shield such that the turbine expands toward the ring as a result of heat within the engine, thereby reducing the tip clearance to minimize air flow along the backface and improve efficiency of the engine.

REFERENCES:
patent: 4460313 (1984-07-01), Austrem
patent: 4522559 (1985-06-01), Burge et al.
patent: 4596116 (1986-06-01), Mandet et al.
patent: 4613288 (1986-09-01), McInerney
patent: 5083424 (1992-01-01), Becker
patent: 5297928 (1994-03-01), Imakire et al.
patent: 5630702 (1997-05-01), Marmillac et al.
patent: 5855112 (1999-01-01), Bannai et al.

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