NDLI: Angled injection: hybrid fluid film bearings for cryogenic applications

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Angled injection: hybrid fluid film bearings for cryogenic applications

Content Provider	NASA Technical Reports Server (NTRS)
Author	SanAndres Sr., Luis
Copyright Year	1995
Description	A computational bulk-flow analysis for prediction of the force coefficients of hybrid fluid film bearings with angled orifice injection is presented. Past measurements on water-lubricated hybrid bearings with angle orifice injection have demonstrated improved rotordynamic performance with virtual elimination of cross-coupled stiffness coefficients and nul or negative whirl frequency ratios. A simple analysis reveals that the fluid momentum exchange at the orifice discharge produces a pressure rise in the recess which retards the shear flow induced by journal rotation, and consequently, reduces cross-coupling forces. The predictions from the model correlate well with experimental measurements from a radial and 45 deg angled orifice injection, five recess water hybrid bearings (C = 125 microns) operating at 10.2, 17.4, and 24.6 krpm and with nominal supply pressures equal to 4, 5.5, and 7 MPa. An application example for a liquid oxygen six recess/pad hybrid journal bearing shows the advantages of tangential orifice injection on the rotordynamic force coefficients and stability indicator for forward whirl motions and without performance degradation on direct stiffness and damping coefficients. The computer program generated, 'hydrojet,' extends and complements previously developed codes.
File Size	2049476
Page Count	60
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960014863
Archival Resource Key	ark:/13960/t7sn5446n
Language	English
Publisher Date	1995-12-31
Access Restriction	Open
Subject Keyword	Mechanical Engineering Rotary Stability Computational Fluid Dynamics Fluid Films Hydrodynamic Coefficients Liquid Injection Rotor Dynamics Flow Equations Turbine Pumps Orifices Liquid Oxygen Liquid Bearings Applications Programs Computers Journal Bearings Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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