Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...
Reexamination Certificate
2011-07-12
2011-07-12
Wiehe, Nathaniel (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With heating, cooling or thermal insulation means
Changing state mass within or fluid flow through working...
Reexamination Certificate
active
07976278
ABSTRACT:
A turbine blade with a leading edge cooling circuit formed from a series of impingement cavities spaced along the leading edge and separated from the serpentine flow cooling circuit in the remaining sections of the airfoil in order to provide for a low cooling flow along the leading edge. The multiple impingement cavities are separated by a slanted rib on the bottom of the cavity, and each slanted rib includes an impingement hole directed to discharge impinging cooling air to the backside wall of the leading edge. Cooling air flows through the series of impingement cavities and into the last impingement cavity formed at the blade tip. The cooling air then is discharged through tip exit cooling holes. The blade with the multiple impingement cavities formed along the leading edge region can be cast using the prior art casting techniques.
REFERENCES:
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patent: 4738587 (1988-04-01), Kildea
patent: 5271715 (1993-12-01), Zelesky et al.
patent: 5387085 (1995-02-01), Thomas et al.
patent: 5462405 (1995-10-01), Hoff et al.
patent: 7137779 (2006-11-01), Liang
Florida Turbine Technologies, Inc.
Ryznic John
Wiehe Nathaniel
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