Robustness of Cryogenic Hybrid Journal Bearings

In the present study, a nine-recess hybrid journal bearing (HJB) having a Young Leaf Mark recess was operated at a rotational speed of up to 75,000 rpm using the cryogenic journal bearing test apparatus at JAXA, to clarify an onset speed of the rotor instability supported by the cryogenic HJBs. Liqu...

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Autores principales:	Mamoru Oike, Masataka Kikuchi, Satoshi Takada, Takayuki Sudo, Tomoyuki Takano
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2012
Materias:	journal bearing cryogenic turbopump robustness rotordynamic performance liquid nitrogen Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/448f3de09246423ab7410b41450d90a0
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spelling	oai:doaj.org-article:448f3de09246423ab7410b41450d90a02021-11-05T09:24:57ZRobustness of Cryogenic Hybrid Journal Bearings1881-219810.2474/trol.7.171https://doaj.org/article/448f3de09246423ab7410b41450d90a02012-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/3/7_171/_pdf/-char/enhttps://doaj.org/toc/1881-2198In the present study, a nine-recess hybrid journal bearing (HJB) having a Young Leaf Mark recess was operated at a rotational speed of up to 75,000 rpm using the cryogenic journal bearing test apparatus at JAXA, to clarify an onset speed of the rotor instability supported by the cryogenic HJBs. Liquid nitrogen was supplied to the test bearing with a pressure of up to 4 MPa. The test bearing is 60 mm in diameter, 25 mm in width, with a 0.055-mm clearance and a recess area ratio of 0.186. When the HJB was operated at a rotational speed of over 74,000 rpm in liquid nitrogen, hard frictional contact between the bearing surface and the journal surface occurred, which consequently caused considerable damage to the Cr2O3 coating film on the journal. The results confirmed that the HJB surface damage had relatively little effect on HJB performance. Therefore, cryogenic HJB tested can be considered to have sufficient robustness when the rotational speed is below 60,000 rpm.Mamoru OikeMasataka KikuchiSatoshi TakadaTakayuki SudoTomoyuki TakanoJapanese Society of Tribologistsarticlejournal bearingcryogenic turbopumprobustnessrotordynamic performanceliquid nitrogenPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 3, Pp 171-178 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	journal bearing cryogenic turbopump robustness rotordynamic performance liquid nitrogen Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	journal bearing cryogenic turbopump robustness rotordynamic performance liquid nitrogen Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Mamoru Oike Masataka Kikuchi Satoshi Takada Takayuki Sudo Tomoyuki Takano Robustness of Cryogenic Hybrid Journal Bearings
description	In the present study, a nine-recess hybrid journal bearing (HJB) having a Young Leaf Mark recess was operated at a rotational speed of up to 75,000 rpm using the cryogenic journal bearing test apparatus at JAXA, to clarify an onset speed of the rotor instability supported by the cryogenic HJBs. Liquid nitrogen was supplied to the test bearing with a pressure of up to 4 MPa. The test bearing is 60 mm in diameter, 25 mm in width, with a 0.055-mm clearance and a recess area ratio of 0.186. When the HJB was operated at a rotational speed of over 74,000 rpm in liquid nitrogen, hard frictional contact between the bearing surface and the journal surface occurred, which consequently caused considerable damage to the Cr2O3 coating film on the journal. The results confirmed that the HJB surface damage had relatively little effect on HJB performance. Therefore, cryogenic HJB tested can be considered to have sufficient robustness when the rotational speed is below 60,000 rpm.
format	article
author	Mamoru Oike Masataka Kikuchi Satoshi Takada Takayuki Sudo Tomoyuki Takano
author_facet	Mamoru Oike Masataka Kikuchi Satoshi Takada Takayuki Sudo Tomoyuki Takano
author_sort	Mamoru Oike
title	Robustness of Cryogenic Hybrid Journal Bearings
title_short	Robustness of Cryogenic Hybrid Journal Bearings
title_full	Robustness of Cryogenic Hybrid Journal Bearings
title_fullStr	Robustness of Cryogenic Hybrid Journal Bearings
title_full_unstemmed	Robustness of Cryogenic Hybrid Journal Bearings
title_sort	robustness of cryogenic hybrid journal bearings
publisher	Japanese Society of Tribologists
publishDate	2012
url	https://doaj.org/article/448f3de09246423ab7410b41450d90a0
work_keys_str_mv	AT mamoruoike robustnessofcryogenichybridjournalbearings AT masatakakikuchi robustnessofcryogenichybridjournalbearings AT satoshitakada robustnessofcryogenichybridjournalbearings AT takayukisudo robustnessofcryogenichybridjournalbearings AT tomoyukitakano robustnessofcryogenichybridjournalbearings
_version_	1718444344837406720

Robustness of Cryogenic Hybrid Journal Bearings

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