Turbine airfoil with variable and compound fillet

Details Turbine airfoil with variable and compound fillet Turbine airfoil with variable and compound fillet

2008-05-13

2008-05-13

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Plural distributing means immediately upstream of runner

C416S19300A, C416S234000

Reexamination Certificate

active

07371046

ABSTRACT:
A turbine airfoil may be a rotating blade having a single platform, or a stationary nozzle having a pair of platforms. The airfoil body has pressure and suction sidewalls extending between leading and trailing edges. A compound fillet is disposed between the airfoil body and at least one of the platforms. The compound fillet includes a concave first fillet having a first radius, and a concave second fillet having a second, greater radius. The second fillet extends from the leading edge downstream along the suction sidewall and terminates at a point upstream of the trailing edge. The second fillet may also extend downstream from the leading edge along the pressure sidewall.

REFERENCES:
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patent: 6419446 (2002-07-01), Kvasnak et al.
patent: 6511294 (2003-01-01), Mielke et al.
patent: 6969232 (2005-11-01), Zess et al.
patent: 2004/0062636 (2004-04-01), Mazzola et al.
patent: 2004/0081548 (2004-04-01), Zess et al.
patent: 19941134 (2000-12-01), None
patent: 1507064 (2005-02-01), None
patent: 61149504 (1986-08-01), None

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