skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Regenerator cross arm seal assembly

Abstract

A seal assembly for disposition between a cross arm on a gas turbine engine block and a regenerator disc, the seal assembly including a platform coextensive with the cross arm, a seal and wear layer sealingly and slidingly engaging the regenerator disc, a porous and compliant support layer between the platform and the seal and wear layer porous enough to permit flow of cooling air therethrough and compliant to accommodate relative thermal growth and distortion, a dike between the seal and wear layer and the platform for preventing cross flow through the support layer between engine exhaust and pressurized air passages, and air diversion passages for directing unregenerated pressurized air through the support layer to cool the seal and wear layer and then back into the flow of regenerated pressurized air.

Inventors:
 [1]
  1. (Indianapolis, IN)
Publication Date:
OSTI Identifier:
866477
Patent Number(s):
US 4720969
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
regenerator; arm; seal; assembly; disposition; gas; turbine; engine; block; disc; including; platform; coextensive; wear; layer; sealingly; slidingly; engaging; porous; compliant; support; permit; flow; cooling; air; therethrough; accommodate; relative; thermal; growth; distortion; dike; preventing; exhaust; pressurized; passages; diversion; directing; unregenerated; cool; regenerated; air passage; thermal growth; engine block; pressurized air; cooling air; seal assembly; turbine engine; gas turbine; assembly including; support layer; engine exhaust; regenerator disc; air passages; relative thermal; arm seal; /60/165/

Citation Formats

Jackman, Anthony V. Regenerator cross arm seal assembly. United States: N. p., 1988. Web.
Jackman, Anthony V. Regenerator cross arm seal assembly. United States.
Jackman, Anthony V. Fri . "Regenerator cross arm seal assembly". United States. doi:. https://www.osti.gov/servlets/purl/866477.
@article{osti_866477,
title = {Regenerator cross arm seal assembly},
author = {Jackman, Anthony V.},
abstractNote = {A seal assembly for disposition between a cross arm on a gas turbine engine block and a regenerator disc, the seal assembly including a platform coextensive with the cross arm, a seal and wear layer sealingly and slidingly engaging the regenerator disc, a porous and compliant support layer between the platform and the seal and wear layer porous enough to permit flow of cooling air therethrough and compliant to accommodate relative thermal growth and distortion, a dike between the seal and wear layer and the platform for preventing cross flow through the support layer between engine exhaust and pressurized air passages, and air diversion passages for directing unregenerated pressurized air through the support layer to cool the seal and wear layer and then back into the flow of regenerated pressurized air.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}

Patent:

Save / Share:
  • In a gas turbine engine having block means defining a pressurized air passage and a hot exhaust gas passage and a cross arm partition separating portions of the air and the exhaust passages, a regenerator disc on the block means intersecting the air and the exhaust passages and rotatable to transfer heat from the exhaust gas to the pressurized air and including an inboard surface, and rim seal means between the disc inboard surface and the block means operative to prevent pressurized air and exhaust gas leakage around the periphery of the disc, an improved cross arm seal assembly ismore » described comprising: a platform generally extensive with the cross arm partition disposed between the latter and the disc inboard surface, a porous and compliant support layer on a surface of the platform facing the disc inboard surface, a seal and wear layer on the support layer defining a barrier to gas passage and sealingly engaging the disc inboard surface, dike means between the seal and wear layer and the platform preventing communication through the support layer between the air and the exhaust passages, seal means between the platform and the cross arm partition preventing communication between the air and the exhaust passages across the cross arm partition, and means on the block means and on the platform operative to direct air from the pressurized air passage to and through the support layer thereby to cool the seal and wear layer.« less
  • This patent describes improvement in a gas turbine engine having block means defining a pressurized air passage and a hot exhaust gas passage and a cross arm partition separating portions of the air and the exhaust passages, a regenerator disc on the block means intersecting the air and the exhaust passages and rotatable to transfer heat from the exhaust gas to the pressurized air and including an inboard surface, and rim seal means between the disc inboard surface and the block means operative to prevent pressurized air and exhaust gas leakage around the periphery of the disc. An improved crossmore » arm seal assembly which comprises a platform generally coextensive with the cross arm partition disposed between the latter and the disc inboard surface, a porous and compliant support layer on a surface of the platform facing the disc inboard surface, a seal and wear layer on the support layer defining a barrier to gas passage and sealingly engaging the disc inboard surface, dike means between the seal and wear layer and the platform preventing communication through the support layer.« less
  • A method for manufacturing a hot side regenerator cross arm seal assembly having a thermally stablilized wear coating with a substantially flat wear surface thereon to seal between low pressure and high pressure passages to and from the hot inboard side of a rotary regenerator matrix includes the steps of forming a flat cross arm substrate member of high nickel alloy steel; fixedly securing the side edges of the substrate member to a holding fixture with a concave surface thereacross to maintain the substrate member to a slightly bent configuration on the fixture surface between the opposite ends of themore » substrate member to produce prestress therein; applying coating layers on the substrate member including a wear coating of plasma sprayed nickel oxide/calcium flouride material to define a wear surface of slightly concave form across the restrained substrate member between the free ends thereon; and thereafter subjecting the substrate member and the coating thereon to a heat treatment of 1600.degree. F. for sixteen hours to produce heat stabilizing growth in the coating layers on the substrate member and to produce a thermally induced growth stress in the wear surface that substantially equalizes the prestress in the substrate whereby when the cross arm is removed from the fixture surface following the heat treatment step a wear face is formed on the cross arm assembly that will be substantially flat between the ends.« less
  • A rotary regenerator disc matrix has a face seal with a cross arm and arcuate rim segments joined by prestress clamps to prestrain the arcuate rim seals so as to compensate seal rim twisting or coning and resultant disc face seal leakage as produced by operating thermal gradients across the seal.
  • A method for manufacturing a hot side regenerator cross arm seal assembly having a thermally stabilized wear coating with a substantially flat wear surface thereon to seal between low pressure and high pressure passages to and from the hot inboard side of a rotary regenerator matrix includes the steps of forming a flat cross arm substrate member of high nickel alloy steel; fixedly securing the side edges of the substrate member to a holding fixture with a concave surface there across to maintain the substrate member to a slightly bent configuration on the fixture surface between the opposite ends ofmore » the substrate member to produce prestress therein; applying coating layers on the substrate member including a wear coating of plasma sprayed nickel oxide/calcium fluoride material to define a wear surface of slightly concave form across the restrained substrate member between the free ends thereon; and thereafter subjecting the substrate member and the coating thereon to a heat treatment of 1,600 F for sixteen hours to produce heat stabilizing growth in the coating layers on the substrate member and to produce a thermally induced growth stress in the wear surface that substantially equalizes the prestress in the substrate whereby when the cross arm is removed from the fixture surface following the heat treatment step a wear face is formed on the cross arm assembly that will be substantially flat between the ends. 4 figs.« less