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Title: Blade platform seal for ceramic/metal rotor assembly

Abstract

A combination ceramic and metal turbine rotor for use in high temperature gas turbine engines includes a metal rotor disc having a rim with a plurality of circumferentially spaced blade root retention slots therein to receive a plurality of ceramic blades, each including side platform segments thereon and a dovetail configured root slidably received in one of the slots. Adjacent ones of the platform segments including edge portions thereon closely spaced when the blades are assembled to form expansion gaps in an annular flow surface for gas passage through the blades and wherein the assembly further includes a plurality of unitary seal members on the rotor connected to its rim and each including a plurality of spaced, axially extending, flexible fingers that underlie and conform to the edge portions of the platform segments and which are operative at turbine operating temperatures and speeds to distribute loading on the platform segments as the fingers are seated against the underside of the blade platforms to seal the gaps without undesirably stressing thin web ceramic sections of the platform.

Inventors:
 [1]
  1. Indianapolis, IN
Issue Date:
OSTI Identifier:
864192
Patent Number(s):
4326835
Assignee:
General Motors Corporation (Detroit, MI)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01D - NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
blade; platform; seal; ceramic; metal; rotor; assembly; combination; turbine; temperature; gas; engines; disc; rim; plurality; circumferentially; spaced; root; retention; slots; therein; receive; blades; including; segments; thereon; dovetail; configured; slidably; received; adjacent; ones; edge; portions; closely; assembled; form; expansion; gaps; annular; flow; surface; passage; unitary; connected; axially; extending; flexible; fingers; underlie; conform; operative; operating; temperatures; speeds; distribute; loading; seated; underside; platforms; undesirably; stressing; web; sections; slidably received; edge portions; adjacent ones; turbine rotor; temperature gas; circumferentially spaced; rotor assembly; turbine engine; gas turbine; operating temperature; closely spaced; operating temperatures; turbine engines; edge portion; annular flow; ceramic blade; axially extending; rotor disc; ceramic blades; slots therein; metal rotor; spaced blade; platform seal; blade platform; blade platforms; blade root; /416/

Citation Formats

Wertz, John L. Blade platform seal for ceramic/metal rotor assembly. United States: N. p., 1982. Web.
Wertz, John L. Blade platform seal for ceramic/metal rotor assembly. United States.
Wertz, John L. Fri . "Blade platform seal for ceramic/metal rotor assembly". United States. https://www.osti.gov/servlets/purl/864192.
@article{osti_864192,
title = {Blade platform seal for ceramic/metal rotor assembly},
author = {Wertz, John L},
abstractNote = {A combination ceramic and metal turbine rotor for use in high temperature gas turbine engines includes a metal rotor disc having a rim with a plurality of circumferentially spaced blade root retention slots therein to receive a plurality of ceramic blades, each including side platform segments thereon and a dovetail configured root slidably received in one of the slots. Adjacent ones of the platform segments including edge portions thereon closely spaced when the blades are assembled to form expansion gaps in an annular flow surface for gas passage through the blades and wherein the assembly further includes a plurality of unitary seal members on the rotor connected to its rim and each including a plurality of spaced, axially extending, flexible fingers that underlie and conform to the edge portions of the platform segments and which are operative at turbine operating temperatures and speeds to distribute loading on the platform segments as the fingers are seated against the underside of the blade platforms to seal the gaps without undesirably stressing thin web ceramic sections of the platform.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}