DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Turbine airfoil to shround attachment

Abstract

A turbine airfoil (31) with an end portion (42) that tapers (44) toward the end (43) of the airfoil. A ridge (46) extends around the end portion. It has proximal (66) and distal (67) sides. A shroud platform (50) is bi-cast onto the end portion around the ridge without bonding. Cooling shrinks the platform into compression (62) on the end portion (42) of the airfoil. Gaps between the airfoil and platform are formed using a fugitive material (56) in the bi-casting stage. These gaps are designed in combination with the taper angle (44) to accommodate differential thermal expansion while maintaining a gas seal along the contact surfaces. The taper angle (44) may vary from lesser on the pressure side (36) to greater on the suction side (38) of the airfoil. A collar portion (52) of the platform provides sufficient contact area for connection stability.

Inventors:
; ; ; ; ; ;
Issue Date:
Research Org.:
Siemens Energy, Inc., Orlando, FL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1130957
Patent Number(s):
8714920
Application Number:
12/752,460
Assignee:
Siemens Energy, Inc. (Orlando, FL)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B22 - CASTING B22D - CASTING OF METALS
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01D - NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
DOE Contract Number:  
FC26-05NT42644
Resource Type:
Patent
Resource Relation:
Patent File Date: 2010 Apr 01
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Campbell, Christian X, Morrison, Jay A, James, Allister W, Snider, Raymond G, Eshak, Daniel M, Marra, John J, and Wessell, Brian J. Turbine airfoil to shround attachment. United States: N. p., 2014. Web.
Campbell, Christian X, Morrison, Jay A, James, Allister W, Snider, Raymond G, Eshak, Daniel M, Marra, John J, & Wessell, Brian J. Turbine airfoil to shround attachment. United States.
Campbell, Christian X, Morrison, Jay A, James, Allister W, Snider, Raymond G, Eshak, Daniel M, Marra, John J, and Wessell, Brian J. Tue . "Turbine airfoil to shround attachment". United States. https://www.osti.gov/servlets/purl/1130957.
@article{osti_1130957,
title = {Turbine airfoil to shround attachment},
author = {Campbell, Christian X and Morrison, Jay A and James, Allister W and Snider, Raymond G and Eshak, Daniel M and Marra, John J and Wessell, Brian J},
abstractNote = {A turbine airfoil (31) with an end portion (42) that tapers (44) toward the end (43) of the airfoil. A ridge (46) extends around the end portion. It has proximal (66) and distal (67) sides. A shroud platform (50) is bi-cast onto the end portion around the ridge without bonding. Cooling shrinks the platform into compression (62) on the end portion (42) of the airfoil. Gaps between the airfoil and platform are formed using a fugitive material (56) in the bi-casting stage. These gaps are designed in combination with the taper angle (44) to accommodate differential thermal expansion while maintaining a gas seal along the contact surfaces. The taper angle (44) may vary from lesser on the pressure side (36) to greater on the suction side (38) of the airfoil. A collar portion (52) of the platform provides sufficient contact area for connection stability.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {5}
}

Works referenced in this record:

Method for improving metallurgical bond in bimetallic castings
patent, February 1977


Method of manufacturing a turbine rotor
patent, January 1985


Method of manufacturing an integral bladed turbine disk
patent, September 1985


Turbine engine component and method of making the same
patent, March 1988


Method of making a turbine engine component
patent, September 1990


Method of making a turbine engine component
patent, December 1991


Method of making a turbine engine component
patent, January 1993


Method of making a composite casting
patent, September 1993


Method of making a composite casting
patent, September 1993


Method of making a composite casting
patent, November 1993


Bicast vane and shroud rings
patent, March 1994


Composite casting method
patent, July 1994


Stator vane having reinforced braze joint
patent, July 1994


Method of making composite castings using reinforcement insert cladding
patent, October 1997


Method of making composite castings using reinforcement insert cladding
patent, November 1999


Low stress connection methodology for thermally incompatible materials
patent, June 2002


Ceramic matrix composite turbine vane
patent, November 2003


Metal casting fabrication method
patent, May 2006


Method for manufacturing cast components
patent, October 2007


Bi-cast blade ring for multi-alloy turbine rotor
patent-application, October 2006