US 12,078,189 B2
Variable vane airfoil with recess to accommodate protuberance
Jason Nichols, Mississauga (CA); David Batch, Mississauga (CA); and Daniel Poick, Brampton (CA)
Assigned to Pratt & Whitney Canada Corp., Longueuil (CA)
Filed by Pratt & Whitney Canada Corp., Longueuil (CA)
Filed on Aug. 9, 2022, as Appl. No. 17/884,167.
Prior Publication US 2024/0052852 A1, Feb. 15, 2024
Int. Cl. F04D 29/56 (2006.01); F01D 5/14 (2006.01); F01D 9/04 (2006.01); F01D 17/16 (2006.01); F04D 29/54 (2006.01); F01D 7/00 (2006.01)
CPC F04D 29/563 (2013.01) [F01D 5/141 (2013.01); F01D 5/147 (2013.01); F01D 9/041 (2013.01); F01D 17/162 (2013.01); F04D 29/547 (2013.01); F01D 7/00 (2013.01); F05D 2240/12 (2013.01); F05D 2240/128 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus for a gas turbine engine, comprising:
an engine flowpath;
a protuberance projecting into the engine flowpath;
a variable vane extending across the engine flowpath, the variable vane comprising a pivot axis and an airfoil, the variable vane configured to pivot about the pivot axis between a first position and a second position;
the airfoil extending spanwise along a span line between a first end and a second end, the airfoil extending chordwise along a chord line between a leading edge and a trailing edge, the airfoil extending laterally between a first side and a second side, and a recess extending spanwise into the airfoil from the first end;
the airfoil, at the first end, spaced from the protuberance when the variable vane is in the first position; and
the airfoil, at the first end, aligned with the protuberance and the protuberance projecting into the recess when the variable vane is in the second position; and
a platform comprising a platform surface;
the airfoil spaced from the platform surface by a gap, the gap having a uniform height chordwise along a section of the airfoil chordwise between the recess and the leading edge, and the gap having a variable height chordwise along the recess.