Rotary kinetic fluid motors or pumps – With changing state confined heat exchange mass
Patent
1998-08-06
2000-02-01
Look, Edward K.
Rotary kinetic fluid motors or pumps
With changing state confined heat exchange mass
415115, 415178, F01D 2508
Patent
active
06019572&
ABSTRACT:
A design for a vane segment having a closed-loop steam cooling system is provided. The vane segment comprises an outer shroud, an inner shroud and an airfoil, each component having a target surface on the inside surface of its walls. A plurality of rectangular waffle structures are provided on the target surface to enhance heat transfer between each component and cooling steam. Channel systems are provided in the shrouds to improve the flow of steam through the shrouds. Insert legs located in cavities in the airfoil are also provided. Each insert leg comprises outer channels located on a perimeter of the leg, each outer channel having an outer wall and impingement holes on the outer wall for producing impingement jets of cooling steam to contact the airfoil's target surface. Each insert leg further comprises a plurality of substantially rectangular-shaped ribs located on the outer wall and a plurality of openings located between outer channels of the leg to minimize cross flow degradation.
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Look Edward K.
McDowell Liam
Siemens Westinghouse Power Corporation
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