Turbine airfoil with trailing edge
First Claim
1. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
- a leading edge and a trailing edge;
a pressure side wall and a suction side wall;
the trailing edge region of the airfoil having a discontinuous taper angle such that when a TBC is applied to the airfoil an ideal surface contour is formed;
the discontinuous taper angle includes a first tapered section and a second tapered section located aft of the first tapered section, the second tapered section having less taper than the first tapered section; and
,the second tapered section produces a substantially constant airfoil wall thickness.
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Accused Products
Abstract
A turbine airfoil with a relatively thick TBC applied over the airfoil surface. The airfoil has a surface contour on the trailing edge region with a forward end having a large amount of taper and a rearward end with less taper such that a substantially constant wall thickness is formed in the rearward end. The TBC is applied over the airfoil surface and tapers off at the trailing edge ends on the pressure side and the suction side walls to produce an ideal surface contour on the airfoil. In another embodiment, the airfoil surface includes a tapered section at the trailing edge region, and the TBC is applied over the taper so that an over-coating is formed. The TBC over-coating is then removed and a smooth and ideal surface contour is produced along the airfoil surface. Small raised bumps each having a height of the desired thickness of the TBC to be applied over the respective bump is used to control the finished thickness of the TBC.
29 Citations
20 Claims
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1. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge and a trailing edge; a pressure side wall and a suction side wall; the trailing edge region of the airfoil having a discontinuous taper angle such that when a TBC is applied to the airfoil an ideal surface contour is formed; the discontinuous taper angle includes a first tapered section and a second tapered section located aft of the first tapered section, the second tapered section having less taper than the first tapered section; and
,the second tapered section produces a substantially constant airfoil wall thickness. - View Dependent Claims (2)
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3. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge and a trailing edge; a pressure side wall and a suction side wall; the trailing edge region of the airfoil having a discontinuous taper angle such that when a TBC is applied to the airfoil an ideal surface contour is formed; and
,a TBC applied over the airfoil surface, the TBC on the pressure side wall tapering off at the trailing edge to zero thickness. - View Dependent Claims (4)
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5. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge and a trailing edge; a pressure side wall and a suction side wall; the trailing edge region of the airfoil having a discontinuous taper angle such that when a TBC is applied to the airfoil an ideal surface contour is formed; and
,a plurality of local bumps extending out from the airfoil surface, each bump having a height substantially equal to the desired thickness of the TBC to be applied around the particular bump.
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6. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge and a trailing edge; a pressure side wall and a suction side wall; a local increase in the airfoil thickness on the pressure side to accommodate strip masking; and
,a TBC applied over the airfoil surface and ending at the local increase thickness. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A process of forming a turbine airfoil with a TBC applied over the airfoil surface, comprising the steps of:
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forming the airfoil surface with a contour having a local increase in airfoil thickness on the trailing edge region of the pressure side of the airfoil; forming the airfoil surface with a reduced contour from the pressure side local increase in thickness to at least the leading edge of the airfoil; applying a TBC to the airfoil surface and past the local increase in thickness such that an over-coating of the TBC is formed; and
,removing the over-coated TBC such that a smooth surface contour is produced along the pressure side surface of the airfoil. - View Dependent Claims (13, 14, 15)
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16. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge and a trailing edge; a pressure side wall and a suction side wall; a positive taper on the pressure side wall and the suction side wall at a beginning of a trailing edge region of the airfoil; a TBC applied over the airfoil and ending at the two positive tapers; and
,the trailing edge region on the pressure side wall and the suction side wall is uncovered by a TBC. - View Dependent Claims (17, 18, 19)
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20. A turbine airfoil for use in a gas turbine engine, the turbine airfoil comprising:
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a leading edge region and a trailing edge region; a pressure side wall and a suction side wall extending between the leading edge region and the trailing edge region; a discontinuous surface formed between the pressure side and suction side walls and the trailing edge region; the trailing edge region is not covered with a TBC; and
,the pressure side and suction side walls are covered with a TBC with a smooth surface transition between the TBC covered walls and the uncovered walls of the airfoil.
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Specification