High twist composite blade

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Having wear liner – sheathing or insert

Reexamination Certificate

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Details

C416S232000, C416S240000, C416S24100B, C416S500000

Reexamination Certificate

active

07931443

ABSTRACT:
A turbomachine with a row of blades in which the blades are structured such that the blades can untwist at higher rotational speeds in order to provide optimal aerodynamics at different rotational speeds. Each blade is formed with a thin slot between the pressure side wall and the suction side wall so that stresses from centrifugal forces occurring during high rotations will not pass from adjacent walls and allow for the blade to untwist more than a solid blade. Each blade is formed from a fiber laminated composite material with the fibers oriented at different directions to form different stiffness in each direction so that a desired untwist can occur based upon a given blade mass and rotational speed. A thin sheet of a slippery material can be placed within the thin slot and between the adjacent airfoil walls to allow slippage between the adjacent walls and to promote damping for the blade.

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patent: 6669447 (2003-12-01), Norris et al.
patent: 7070390 (2006-07-01), Powell
patent: 7311500 (2007-12-01), Rongong et al.
patent: 2005/0047918 (2005-03-01), Powell

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