Cooling pedestal array

Abstract

A turbine engine component includes a first surface to be cooled by a flow of cooling air. The first surface includes a pedestal array and a first row of contour bumps. The pedestal array includes first and second rows of pedestals extending from the first surface. The second row of pedestals runs in a direction generally parallel to the first row of pedestals. The first row of contour bumps extends from the first surface between the first row of pedestals and the second row of pedestals and runs parallel to the first row of pedestals. The first row of contour bumps is aligned such that at least one of the contour bumps of the first row of contour bumps is positioned at least one of immediately downstream of a pedestal of the first row of pedestals and immediately upstream of a pedestal of the second row of pedestals.

1 . A turbine engine component comprising:
 a first surface to be cooled by a flow of cooling air, the first surface including:
 a pedestal array physically connected to the first surface, the pedestal array including:
 a first row of pedestals extending from the first surface; and 
 a second row of pedestals extending from the first surface and running in a direction generally parallel to the first row of pedestals; and 
 
 a first row of contour bumps extending from the first surface between the first row of pedestals and the second row of pedestals and running in a direction generally parallel to the first row of pedestals; the first row of contour bumps aligned such that at least one contour bump of the first row of contour bumps is positioned at least one of immediately downstream of a pedestal of the first row of pedestals and immediately upstream of a pedestal of the second row of pedestals. 
   
     
     
         2 . The component of  claim 1 , wherein the first row of contour bumps extends a first distance from the first surface, the first row of pedestals extends a second distance from the first surface; the second row of pedestals extends a third distance from the first surface, and the first distance is less than 40% and more than 5% of the second distance and the third distance. 
     
     
         3 . The component of  claim 1 , wherein the first row of contour bumps restricts the flow of cooling air between the first row of pedestals and the second row of pedestals to an extent less than the first row of pedestals and the second row of pedestals restrict the flow of cooling air. 
     
     
         4 . The component of  claim 1 , wherein the second row of pedestals is offset from the first row of pedestals in the parallel direction. 
     
     
         5 . The component of  claim 4 , wherein the second row of pedestals is offset from the first row of pedestals in the parallel direction by one-half of a pitch of the first row of pedestals 
     
     
         6 . The component of  claim 1 , wherein contour bumps of the first row of contour bumps have a shape that is one of a spherical dome, an ellipsoidal dome, a tear drop, and a bulb tapered at both ends. 
     
     
         7 . The component of  claim 1 , wherein,
 the pedestal array further comprises:
 a plurality of rows of pedestals extending from the first surface and running in a direction parallel to the second row of pedestals on a side of the second row of pedestals opposite the first row of pedestals; each of the plurality of rows of pedestals extending from the first surface one or more distances; and 
   the first surface further comprises:
 a plurality of rows of contour bumps, at least one of the plurality of rows of contour bumps extending from the first surface between adjacent rows of pedestals and running in a direction generally parallel to the adjacent rows of pedestals; at least one of the plurality of rows of contour bumps extending from the first surface less than 40% and more than 5% of the distance both adjacent rows of pedestals extend from the first surface. 
   
     
     
         8 . The component of  claim 7 , wherein the pedestal array further comprises:
 a plurality of rows of pedestals running in a direction parallel to the first row of pedestals;   wherein the plurality of rows of pedestals runs on a side of the first row of pedestals opposite the second row of pedestals.   
     
     
         9 . The component of  claim 7 , wherein at least one of the plurality of rows of pedestals is offset from an adjacent row of pedestals by one-half of a pitch of the adjacent row of pedestals. 
     
     
         10 . The component of  claim 1 , further comprising:
 a second surface to be cooled by the flow of cooling air; the second surface opposite the first surface such that the first row of pedestals and the second row of pedestals each extend to the second surface to create a flow passage between the first surface and the second surface; the second surface including:
 a second row of contour bumps extending from the second surface between the first row of pedestals and the second row of pedestals and running in a direction generally parallel to the first row of pedestals; the second row of contour bumps aligned such that at least one contour bump of the second row of contour bumps is positioned at least one of immediately downstream of a pedestal of the first row of pedestals and immediately upstream of a pedestal of the second row of pedestals. 
   
     
     
         11 . The component of  claim 10 , wherein the first row of contour bumps extends a first distance from the first surface, the second row of contour bumps extends a second distance from the second surface, the first row of pedestals extends a third distance from the first surface; the second row of pedestals extends a forth distance from the first surface; and the first distance and the second distance are each less than 40% and more than 5% of the third distance and the fourth distance. 
     
     
         12 . The component of  claim 10 , wherein the first row of contour bumps and the second row of contour bumps together restrict the flow of cooling air between the first row of pedestals and the second row of pedestals to an extent less than the first row of pedestals and the second row of pedestals restrict the flow of cooling air. 
     
     
         13 . The component of  claim 10 , wherein the first row of contour bumps is aligned such that at least one contour bump of the first row of contour bumps is positioned immediately downstream of a pedestal of the first row of pedestals; and the second row of contour bumps is aligned such that at least one contour bump of the second row of contour bumps is positioned immediately upstream of a pedestal of the second row of pedestals. 
     
     
         14 . The component of  claim 10 , wherein,
 the pedestal array further comprises:
 a plurality of rows of pedestals extending from the first surface and running in a direction parallel to the second row of pedestals on a side of the second row of pedestals opposite the first row of pedestals; each of the plurality of rows of pedestals extending from the first surface one or more distances to the second surface; 
   the first surface further comprises:
 a first plurality of rows of contour bumps, at least one of the first plurality of rows of contour bumps extending from the first surface between adjacent rows of pedestals and running in a direction generally parallel to the adjacent rows of pedestals; at least one of the first plurality of rows of contour bumps extending from the first surface less than 40% and more than 5% of the distance both adjacent rows of pedestals extend from the first surface to the second surface; and 
   the second surface further comprises:
 a second plurality of rows of contour bumps, at least one of the second plurality of rows of contour bumps extending from the second surface between adjacent rows of pedestals and running in a direction generally parallel to the adjacent rows of pedestals; at least one of the second plurality of rows of contour bumps extending from the second surface less than 40% and more than 5% of the distance both adjacent rows of pedestals extend from the first surface to the second surface. 
   
     
     
         15 . The component of  claim 14 , wherein the pedestal array further comprises:
 a plurality of rows of pedestals running in a direction parallel to the first row of pedestals; at least one of the rows of pedestals offset from an adjacent row of pedestals by one-half of the pitch of the adjacent row of pedestals;   wherein the plurality of rows of pedestals runs on a side of the first row of pedestals opposite the second row of pedestals.   
     
     
         16 . The component of  claim 14 , wherein at least one of the plurality of rows of pedestals is offset from an adjacent row of pedestals by one-half of a pitch of the adjacent row of pedestals. 
     
     
         17 . The component of  claim 10 , wherein contour bumps of the first row of contour bumps and contour bumps of the second row of contour bumps have a shape that is one of a spherical dome, an ellipsoidal dome, a tear drop, and a bulb tapered at both ends. 
     
     
         18 . A gas turbine engine comprising:
 a combustor;   a turbine including:
 a plurality of rotor stages; and 
 a plurality of stator stages interspersed between the plurality of rotor stages; and 
   a component to be cooled within at least one of the combustor and the turbine, the component comprising:
 a first surface to be cooled by a flow of cooling air, the first surface including:
 a pedestal array physically connected to the first surface, the pedestal array including:
 a first row of pedestals extending from the first surface; and 
 a second row of pedestals extending from the first surface and running in a direction generally parallel to the first row of pedestals; and 
 
 a first row of contour bumps extending from the first surface between the first row of pedestals and the second row of pedestals and running in a direction generally parallel to the first row of pedestals; the first row of contour bumps aligned such that at least one contour bump of the first row of contour bumps is positioned at least one of immediately downstream of a pedestal of the first row of pedestals and immediately upstream of a pedestal of the second row of pedestals. 
 
   
     
     
         19 . The engine of  claim 18 , wherein the combustor comprises:
 a plurality of combustor liner panels lining an inside of the combustor, each of the plurality of combustor liner panels having an inner surface facing the inside of the combustor and an outer surface facing away from the inside of the combustor, and the component to be cooled within at least one of the combustor and the turbine is at least one of the plurality of combustor liner panels.   
     
     
         20 . The engine of  claim 18 , wherein at least one of the plurality of stator stages comprises:
 a plurality of stator vanes, each stator vane including:
 an inner diameter platform having radially inward facing surface and radially outward facing surface; 
 an outer diameter platform having an radially inward facing surface and a radially outward facing surface; and 
 an airfoil extending radially between the radially outward facing surface of the inner diameter platform and the radially inward facing surface of the outer diameter platform; 
   wherein the component to be cooled within the turbine is at least one of the outer diameter platform, the inner diameter platform, and the airfoil.   
     
     
         21 . The engine of  claim 18 , wherein at least one of the plurality of rotor stages comprises:
 a plurality of rotor blades; and   a plurality of blade outer air seals disposed radially outward from the plurality of rotor blades; and   the component to be cooled within the turbine is at least one of the plurality of blade outer air seals.   
     
     
         22 . The engine of  claim 18 , wherein at least one of the plurality of rotor stages comprises:
 a plurality of rotor blades, each rotor blade including:
 an airfoil; and 
 a platform from which the airfoil extends radially outward; 
   wherein the component to be cooled within the turbine is at least one of the platform and the airfoil.   
     
     
         23 . A method for cooling a surface within an internal cooling channel, the method comprising:
 introducing cooling air into a pedestal array on the surface to be cooled,   flowing the cooling air between adjacent pedestals of a first row of pedestals attached to the surface;   flowing the cooling air over and between adjacent contour bumps of a row of contour bumps beyond the first row of pedestals; and   flowing the cooling air between adjacent pedestals of a second row of pedestals attached to the surface beyond the row of contour bumps;   wherein flowing the cooling air over and between adjacent contour bumps comprises at least one of increasing heat transfer in a separation zone by flowing cooling air over contour bumps aligned immediately downstream of the first row of pedestals and compensating for a lack of blocking in a downstream channel region by flowing cooling air over contour bumps aligned immediately upstream of a pedestal of the second row of pedestals.   
     
     
         24 . A turbine engine component comprising:
 a first surface to be cooled by a flow of cooling air, the first surface including:
 a pedestal array physically connected to the first surface, the pedestal array including:
 a first row of pedestals extending from the first surface; and 
 a second row of pedestals extending from the first surface and running in a direction generally parallel to the first row of pedestals; and 
 
 a first row of contour bumps extending from the first surface between the first row of pedestals and the second row of pedestals and running in a direction generally parallel to the first row of pedestals; wherein contour bumps of the first row of contour bumps have a shape that is one of an ellipsoidal dome, a tear drop, and a bulb tapered at both ends.