Engine component

Abstract

An engine component for a gas turbine engine includes a film-cooled substrate having a hot surface facing hot combustion gas flow and a cooling surface facing a cooling fluid flow. A film hole extends through the substrate to an outlet on the hot surface. A flow conditioning structure is provided upstream of the outlet.

1 - 20 . (canceled) 
     
     
         21 . An engine component for a gas turbine engine, the gas turbine engine generating hot combustion gas flow, comprising:
 a substrate having a hot surface facing the hot combustion gas flow and a cooling surface facing a cooling fluid flow, the hot combustion gas flow generally defining an upstream direction and a downstream direction relative to the hot surface;   a film hole extending through the substrate and having an inlet provided on the cooling surface, an outlet provided on the hot surface, and a passage connecting the inlet and the outlet, with the outlet having a polygonal cross section; and   a flow conditioning structure having a polygonal planform provided upstream of and in streamline alignment with the outlet on the hot surface.   
     
     
         22 . The engine component of  claim 21 , wherein at least one of the polygonal cross section and the polygonal planform increase in width in the downstream direction. 
     
     
         23 . The engine component of  claim 22 , wherein both of the polygonal cross section and the polygonal planform increase in width in the downstream direction. 
     
     
         24 . The engine component of  claim 23 , wherein a largest width of the polygonal planform is less than a smallest width of the polygonal cross section. 
     
     
         25 . The engine component of  claim 24 , wherein the increase in width is continuous. 
     
     
         26 . The engine component of  claim 21 , wherein the flow conditioning structure comprises a recess in the hot surface. 
     
     
         27 . The engine component of  claim 26 , wherein the recess is immediately adjacent to the outlet. 
     
     
         28 . The engine component of  claim 21 , wherein the flow conditioning structure comprises a projection from the hot surface. 
     
     
         29 . The engine component of  claim 28 , wherein the projection is immediately adjacent to the outlet. 
     
     
         30 . The engine component of  claim 21 , wherein the passage comprises a metering section defining the inlet and a diffusing section defining the outlet. 
     
     
         31 . The engine component of  claim 30 , wherein a portion of the perimeter of the outlet defined by the diffusing section is contiguous with a portion of the flow conditioning structure. 
     
     
         32 . The engine component of  claim 21 , wherein the passage defines a centerline that is inclined in the downstream direction such that the centerline is non-orthogonal to the cooling surface and the hot surface. 
     
     
         33 . The engine component of  claim 21 , wherein the engine component comprises one of a blade, a vane, a shroud, or a combustor liner. 
     
     
         34 . The engine component of  claim 21  wherein the substrate comprises an exterior wall of the engine component which defines an interior to which the cooling fluid flow is supplied. 
     
     
         35 . An engine component for a gas turbine engine, the gas turbine engine generating hot combustion gas flow, comprising:
 a substrate having a hot surface facing the hot combustion gas flow and a cooling surface facing a cooling fluid flow, the hot combustion gas flow generally defining an upstream direction and a downstream direction relative to the hot surface;   a film hole extending through the substrate and having an inlet provided on the cooling surface, an outlet provided on the hot surface, and a passage connecting the inlet and the outlet, with the outlet having a polygonal cross section; and   a flow conditioning structure comprising a recess with a polygonal planform in the hot surface provided upstream of the outlet on the hot surface.   
     
     
         36 . The engine component of  claim 35 , wherein at least one of the polygonal cross section and the polygonal planform increase in width in the downstream direction. 
     
     
         37 . The engine component of  claim 36 , wherein a largest width of the polygonal planform is less than a smallest width of the polygonal cross section. 
     
     
         38 . An engine component for a gas turbine engine, the gas turbine engine generating hot combustion gas flow, comprising:
 a substrate having a hot surface facing the hot combustion gas flow and a cooling surface facing a cooling fluid flow, the hot combustion gas flow generally defining an upstream direction and a downstream direction relative to the hot surface;   a film hole extending through the substrate and having an inlet provided on the cooling surface, an outlet having a polygonal cross section provided on the hot surface, and a passage connecting the inlet and the outlet; and   a flow conditioning structure comprising a projection, with a polygonal planform, from the hot surface provided upstream of the outlet on the hot surface.   
     
     
         39 . The engine component of  claim 35 , wherein at least one of the polygonal cross section and the polygonal planform increase in width in the downstream direction. 
     
     
         40 . The engine component of  claim 36 , wherein a largest width of the polygonal planform is less than a smallest width of the polygonal cross section.