Turbine blade including balanced mateface condition

Patent metadata

Field	Value
Publication number	US-10480333-B2
Application number	US-201715607998-A
Country	US
Kind code	B2
Filing date	May 30, 2017
Priority date	May 30, 2017
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A blade for a gas powered turbine includes a platform having a leading edge and a trailing edge. The leading edge is connected to the trailing edge by a suction side mateface and by a pressure side mateface. A blade extends outward from the platform. The blade has a foil shaped cross section and a suction side of the blade faces the suction side mateface and a pressure side of the blade faces the pressure side mateface. A radial height of the suction side mateface is different from a radial height of the pressure side mateface at a first axial position.

First claim

The invention claimed is:

1. A blade for a gas powered turbine comprising:
a platform having a leading edge and a trailing edge, the leading edge being connected to the trailing edge by a suction side mateface and by a pressure side mateface;
a blade extending outward from said platform, the blade having an airfoil shaped cross section, wherein a suction side of the blade faces the suction side mateface, and a pressure side of the blade faces the pressure side mateface; and
a radial height of the suction side mateface is different from a radial height of the pressure side mateface at a first axial position, and wherein a difference between the radial height of the suction side mateface and the radial height of the pressure side mateface at the first axial position is an ideal disparity for a balanced manufacturing range at the first axial position.

2. The blade of claim 1 , wherein the ideal balanced manufacturing range is a radial height difference configured to balance negative waterfall effects and negative damming effects that arise due to manufacturing variability.

3. The blade of claim 1 , wherein the ideal disparity is in a range of disparities that generate a waterfall effect in an assembled rotor system.

4. The blade of claim 1 , wherein the platform further comprises a contoured radially outward facing surface, and wherein at least one contour of the contoured radially outward facing surface extends to one of said suction side mateface and said pressure side mateface.

5. The blade of claim 4 , wherein the radial height of the suction side mateface is different from the radial height of the pressure side mateface at a second axial position, and wherein the difference at the second axial position is distinct from the difference at the first axial position.

6. The blade of claim 5 , wherein the radial height of the suction side mateface is the same as the radial height of the pressure side mateface at a third axial position.

7. The blade of claim 6 , wherein the third axial position is between the first axial position and the second axial position.

8. The blade of claim 1 , wherein the blade is a rotor blade for one of a turbine based aircraft engine and a land based turbine.

9. A gaspath component for a gas powered turbine comprising:
a platform having a leading edge and a trailing edge, the leading edge being connected to the trailing edge by a first side mateface and by a second side mateface circumferentially opposite the first side mateface; and
a radial height of the first side mateface is different from a radial height of the second side mateface at a first axial position, wherein a difference between the radial height of the first side mateface and the radial height of the second side mateface at the first axial position is an ideal disparity for a balanced manufacturing range at the first axial position, and the ideal balanced manufacturing range is a radial height difference configured to balance negative waterfall effects and negative damming effects that arise due to manufacturing variability.

10. The gaspath component of claim 9 , wherein the ideal disparity is in a range of disparities that generate a waterfall effect in an assembled rotor system.

11. The gaspath component of claim 9 , wherein the platform further comprises a contoured radially facing surface, and wherein at least one contour of the contoured radially facing surface extends to one of said first side mateface and said second side mateface.

12. The gaspath component of claim 11 , wherein the radial height of the first side mateface is different from the radial height of the second side mateface at a second axial position, and wherein the difference at the second axial position is distinct from the difference at the first axial position.

13. The gaspath component of claim 12 , wherein the radial height of the first side mateface is the same as the radial height of the second side mateface at a third axial position.

14. A gas powered turbine comprising:
a compressor section;
a combustor section fluidly connected to the compressor section;
a turbine section fluidly connected to the combustor section;
at least one of said compressor section and said turbine section including a rotor stage comprised of a plurality of rotor blades, wherein each of said rotor blades includes a blade extending outward from a platform, the blade having an airfoil shaped cross section, wherein a suction side of the blade faces a suction side mateface of the platform, and a pressure side of the blade faces a pressure side mateface of the platform and a radial height of the suction side mateface is different from a radial height of the pressure side mateface at a first axial position, such that a radial height disparity exists across a mateface gap at any given axial position wherein the radial height disparity is an ideal disparity for a balanced manufacturing range at a first axial position.

15. The gas powered turbine of claim 14 , wherein the mateface gap is a gap disposed between a suction side mateface of a first platform and a pressure side mateface of a second platform circumferentially adjacent to the first platform.

16. The gas powered turbine of claim 14 , wherein the ideal balanced manufacturing range is a radial height difference configured to balance negative waterfall effects and negative damming effects that arise due to manufacturing variability.

Assignees

• United Technologies Corp

Inventors

• Molony Evan P
• Clum Carey
• Balzer Wolfgang

Classifications

• F05D2240/80

  Platforms for stationary or moving blades · CPC title

• F01D5/141

  Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147) · CPC title

• F01D5/145

  Means for influencing boundary layers or secondary circulations (for compressors F04D29/68) · CPC title

• F01D11/006

  Sealing the gap between rotor blades or blades and rotor · CPC title

• F01D5/147

  Construction, i.e. structural features, e.g. of weight-saving hollow blades (F01D5/148, F01D5/16 and F01D5/20 take precedence; blade shape F01D5/141; blades with cooling or heating channels or cavities F01D5/18; heating, heat-insulating or cooling means on blades F01D5/18) · CPC title