Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps

In the present study, a flow visualization experiment in the clearance between a clear floating-ring and a rotating journal was carried out in order to clarify the effects of the recess geometry on the flow characteristics. Five types of the floating-rings with different recess geometries, i.e., the...

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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 2018
Materias:	journal bearing cryogenic turbopump flow visualization recess geometry recess sweepback angle cavitating flow 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/5682c1b5064347a2936e08b1742c5b01
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id	oai:doaj.org-article:5682c1b5064347a2936e08b1742c5b01
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spelling	oai:doaj.org-article:5682c1b5064347a2936e08b1742c5b012021-11-05T09:19:16ZEffects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps1881-219810.2474/trol.13.140https://doaj.org/article/5682c1b5064347a2936e08b1742c5b012018-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/13/3/13_140/_pdf/-char/enhttps://doaj.org/toc/1881-2198In the present study, a flow visualization experiment in the clearance between a clear floating-ring and a rotating journal was carried out in order to clarify the effects of the recess geometry on the flow characteristics. Five types of the floating-rings with different recess geometries, i.e., the plane rhombus, the plane circle, the revise circular Young Leaf Mark, the dome and the revise dome geometries, were operated at a rotational speed of up to 40,000 rpm using liquid nitrogen as the working fluid to observe the interaction between source flow from the recess and rotating flow induced by the journal rotation in the clearance. The cavitation cloud inside the clearance was induced by viscous frictional heating and the pressure drop. The influence of the sweepback angle (θs) of the recess leading edge on the flow characteristics was investigated by comparing flow coefficient (Cf) and the cavitation cloud area ratio (Ac) obtained from the visual image. Based on the experimental results, it may be confirmed that the effects of the recess geometry on the flow characteristics of the cryogenic hybrid journal bearings are mainly caused by the influence of the θs value on the flow condition.Mamoru OikeMasataka KikuchiSatoshi TakadaTakayuki SudoTomoyuki TakanoJapanese Society of Tribologistsarticlejournal bearingcryogenic turbopumpflow visualizationrecess geometryrecess sweepback anglecavitating flowliquid nitrogenPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 13, Iss 3, Pp 140-151 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	journal bearing cryogenic turbopump flow visualization recess geometry recess sweepback angle cavitating flow 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 flow visualization recess geometry recess sweepback angle cavitating flow 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 Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
description	In the present study, a flow visualization experiment in the clearance between a clear floating-ring and a rotating journal was carried out in order to clarify the effects of the recess geometry on the flow characteristics. Five types of the floating-rings with different recess geometries, i.e., the plane rhombus, the plane circle, the revise circular Young Leaf Mark, the dome and the revise dome geometries, were operated at a rotational speed of up to 40,000 rpm using liquid nitrogen as the working fluid to observe the interaction between source flow from the recess and rotating flow induced by the journal rotation in the clearance. The cavitation cloud inside the clearance was induced by viscous frictional heating and the pressure drop. The influence of the sweepback angle (θs) of the recess leading edge on the flow characteristics was investigated by comparing flow coefficient (Cf) and the cavitation cloud area ratio (Ac) obtained from the visual image. Based on the experimental results, it may be confirmed that the effects of the recess geometry on the flow characteristics of the cryogenic hybrid journal bearings are mainly caused by the influence of the θs value on the flow condition.
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	Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
title_short	Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
title_full	Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
title_fullStr	Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
title_full_unstemmed	Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps
title_sort	effects of the recess geometry on flow characteristics of cryogenic hybrid journal bearings for rocket turbopumps
publisher	Japanese Society of Tribologists
publishDate	2018
url	https://doaj.org/article/5682c1b5064347a2936e08b1742c5b01
work_keys_str_mv	AT mamoruoike effectsoftherecessgeometryonflowcharacteristicsofcryogenichybridjournalbearingsforrocketturbopumps AT masatakakikuchi effectsoftherecessgeometryonflowcharacteristicsofcryogenichybridjournalbearingsforrocketturbopumps AT satoshitakada effectsoftherecessgeometryonflowcharacteristicsofcryogenichybridjournalbearingsforrocketturbopumps AT takayukisudo effectsoftherecessgeometryonflowcharacteristicsofcryogenichybridjournalbearingsforrocketturbopumps AT tomoyukitakano effectsoftherecessgeometryonflowcharacteristicsofcryogenichybridjournalbearingsforrocketturbopumps
_version_	1718444410549567488

Effects of the Recess Geometry on Flow Characteristics of Cryogenic Hybrid Journal Bearings for Rocket Turbopumps

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