Ultra-High-Speed Performance of Ball Bearings and Annular Seals in Liquid Hydrogen at Up to 3 Million DN (120,000 rpm)©

Autor:	Sudo Takayuki, Masataka Nosaka, Satoshi Takada, Makoto Yoshida, Masataka Kikuchi
Rok vydání:	2004
Předmět:	Materials science Bearing (mechanical) Mechanical Engineering Nozzle Thrust Surfaces and Interfaces Surfaces Coatings and Films law.invention Mechanics of Materials law visual_art visual_art.visual_art_medium Ball (bearing) Ceramic Composite material Turbopump Liquid hydrogen Retainer
Zdroj:	Tribology Transactions. 47:43-53
ISSN:	1547-397X 1040-2004
DOI:	10.1080/05698190490279047
Popis:	The ultra-high-speed performance of a hybrid ceramic 25-mm-bore ball bearing, as well as that of floating-ring seals with a sealing diameter of 30 mm, was determined in liquid hydrogen at speeds to 120,000 rpm, 3 million DN, under thrust loads to 3,140 N and sealed pressures to 1.7 MPaG. The bearings had Si3N4 balls and a single outer land-guided retainer. The hybrid ceramic bearing exhibited excellent performance at high load, contrasting with the seized all-steel bearing; however, the ceramic balls developed superficial micro-cracks due to frictional heating. Effective cooling of the bearing was achieved by increasing the jet speed through the nozzles. The bearing power loss drastically increased with increasing speed and cooling flow rate. The critical load capacity without bearing damage was also evaluated. Furthermore, the sealing performance of the one-ring seal was superior to that of the two-ring seal in preventing the sealing ring seizure against the runner.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6f11deba9767bab3e586f48da7d395d1 https://doi.org/10.1080/05698190490279047 Zobrazit plný text záznamu