Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Reexamination Certificate
2006-11-16
2009-12-01
Nguyen, Ninh H (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
C029S889200
Reexamination Certificate
active
07625180
ABSTRACT:
A turbine airfoil with a near wall cooling design that reduces the airfoil main body metal temperature and reduces the cooling flow requirement for increased turbine efficiency. The airfoil includes a main body portion with internal cooling air supply cavities separated by one or more ribs, and a plurality of impingement cells formed on the outer surface on the pressure side and suction side of the airfoil main body. The impingement cells with film cooling holes are formed by placing a filler material within the cells and partially formed film cooling holes extending from the side wall of the cell. A thin outer airfoil wall is formed over the main body with the filler material filled cells. The filler material is leached out from the airfoil, leaving the impingement cells with the film cooling hole extending out from the side and covered by the thin outer airfoil wall. The airfoil is thus formed with a thin outer wall and the film cooling holes are formed within the outer wall without machining. The film cooling holes can be formed as straight holes, diffusion holes, or metering and diffusions holes. Also, the metering and diffusion hole connecting the cooling supply cavity to the impingement cell can be varied throughout the airfoil to regulate the pressure and cooling flow over the airfoil to control the metal temperature thereof.
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Florida Turbine Technologies, Inc.
Nguyen Ninh H
Ryznic John
LandOfFree
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