Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen

Liquid hydrogen (LH2) is excellent in extensive storage and transportation systems, such as being used as fuel in highly efficient liquid-rocket engines. To consider the use of LH2 required for future hydrogen-energy systems, this paper presents a topical review of previous cryogenic tribology studi...

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Autor principal:	Masataka Nosaka
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2011
Materias:	cryogenic tribology solid lubrication ptfe ball bearing hybrid ceramic bearing shaft seal mechanical seal floating-ring seal liquid hydrogen liquid oxygen 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/6571aad8df4a4b80ab2acabcebcc2d77
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spelling	oai:doaj.org-article:6571aad8df4a4b80ab2acabcebcc2d772021-11-05T09:26:08ZCryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen1881-219810.2474/trol.6.133https://doaj.org/article/6571aad8df4a4b80ab2acabcebcc2d772011-01-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/6/2/6_2_133/_pdf/-char/enhttps://doaj.org/toc/1881-2198Liquid hydrogen (LH2) is excellent in extensive storage and transportation systems, such as being used as fuel in highly efficient liquid-rocket engines. To consider the use of LH2 required for future hydrogen-energy systems, this paper presents a topical review of previous cryogenic tribology studies on the research and development of the bearings and shaft seals for LH2 turbopumps. Cryogenic tribology studies were conducted for the LE-5/LE-7 rocket engines of the Japanese H-2 rocket as well as for an advanced ultra-high-speed LH2 turbopump. The tribo-chemical formation of CaF2/FeF2 film due to the reduction power of LH2 showed excellent self-lubrication, resulting in a sound wear condition within the turbopump bearing. A new hybrid ceramic bearing with Si3N4 balls, which bearing had a single-guided retainer, tested excellently at an ultra-high speed of 120,000 rpm (3 million DN) in LH2. Seal performance for the floating-ring seals using Ag-plated metal seal-rings at ultra-high speeds was also tested.Masataka NosakaJapanese Society of Tribologistsarticlecryogenic tribologysolid lubricationptfeball bearinghybrid ceramic bearingshaft sealmechanical sealfloating-ring sealliquid hydrogenliquid oxygenPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 6, Iss 2, Pp 133-141 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	cryogenic tribology solid lubrication ptfe ball bearing hybrid ceramic bearing shaft seal mechanical seal floating-ring seal liquid hydrogen liquid oxygen Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	cryogenic tribology solid lubrication ptfe ball bearing hybrid ceramic bearing shaft seal mechanical seal floating-ring seal liquid hydrogen liquid oxygen Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Masataka Nosaka Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
description	Liquid hydrogen (LH2) is excellent in extensive storage and transportation systems, such as being used as fuel in highly efficient liquid-rocket engines. To consider the use of LH2 required for future hydrogen-energy systems, this paper presents a topical review of previous cryogenic tribology studies on the research and development of the bearings and shaft seals for LH2 turbopumps. Cryogenic tribology studies were conducted for the LE-5/LE-7 rocket engines of the Japanese H-2 rocket as well as for an advanced ultra-high-speed LH2 turbopump. The tribo-chemical formation of CaF2/FeF2 film due to the reduction power of LH2 showed excellent self-lubrication, resulting in a sound wear condition within the turbopump bearing. A new hybrid ceramic bearing with Si3N4 balls, which bearing had a single-guided retainer, tested excellently at an ultra-high speed of 120,000 rpm (3 million DN) in LH2. Seal performance for the floating-ring seals using Ag-plated metal seal-rings at ultra-high speeds was also tested.
format	article
author	Masataka Nosaka
author_facet	Masataka Nosaka
author_sort	Masataka Nosaka
title	Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
title_short	Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
title_full	Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
title_fullStr	Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
title_full_unstemmed	Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen
title_sort	cryogenic tribology of high-speed bearings and shaft seals in liquid hydrogen
publisher	Japanese Society of Tribologists
publishDate	2011
url	https://doaj.org/article/6571aad8df4a4b80ab2acabcebcc2d77
work_keys_str_mv	AT masatakanosaka cryogenictribologyofhighspeedbearingsandshaftsealsinliquidhydrogen
_version_	1718444353155760128

Cryogenic Tribology of High-Speed Bearings and Shaft Seals in Liquid Hydrogen

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