Air cooled turbine airfoil

Fluid reaction surfaces (i.e. – impellers) – With heating – cooling or thermal insulation means – Changing state mass within or fluid flow through working...

Reexamination Certificate

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C416S09600A

Reexamination Certificate

active

08043057

ABSTRACT:
A turbine airfoil with a multiple impingement cooling circuit to provide backside impingement cooling of the leading edge region and the pressure and suction side walls. A leading edge cavity and a mid-chord cavity are separated by a rib. A first baffle is secured within the leading edge cavity and forms a series of impingement compartments and impingement cooling holes to channel cooling air along the first baffle and provide impingement cooling along the backside wall of the leading edge region. A second baffle is secured within the mid-chord cavity and forms a series of pressure side and suction side impingement compartments and impingement cooling holes alternating from the pressure side wall to the suction side wall to channel cooling air along the second baffle and provide impingement cooling along the backside walls of the pressure and suction sides. A spent air collection channel extends along the trailing edge region and is connected to a row of exit cooling holes along the trailing edge of the airfoil. Cooling air from the first baffle flows into the second baffle, and from the second baffle into the spend air collection channel and out through the exit cooling holes.

REFERENCES:
patent: 6193465 (2001-02-01), Liotta et al.
patent: 6874988 (2005-04-01), Tiemann

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