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There are a total of 10 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Analysis for leakage and rotordynamic coefficients of surface roughened tapered annular gas seals
Author(s): Nelson, C. C.
Abstract: In order to soften the effects of rub, the smooth stators of turbine gas seals are sometimes replaced by a honeycomb surface. This deliberately roughened stator and smooth rotor combination retards the seal leakage and may ...
NASA Center: NASA (non Center Specific)
Publication Year: 1984
Added to NTRS: 2007-05-24
Accession Number: 85N14135; Document ID: 19850005826
Theory versus experiment for the rotordynamic coefficients of annular gas seals. II - Constant-clearance and convergent-tapered geometry
Author(s): Nelson, C. C.; Childs, D. W.; Nicks, C.; Elrod, D.
Abstract: The leakage and rotordynamic coefficients of constant-clearance and convergent-tapered annular gas seals were measured in an experimental test facility. The results are presented along with the theoretically predicted ...
NASA Center: NASA (non Center Specific)
Publication Year: 1985
Added to NTRS: 2004-11-03
Accession Number: 86A24482; Document ID: 19860039744; Report Number: ASME PAPER 85-TRIB-2
Analysis for leakage and rotordynamic coefficients of surface-roughened tapered annular gas seals
Author(s): Nelson, C. C.
Abstract: The present analysis calculates the leakage and rotor-dynamic coefficients for tapered annular gas seals whose rotor and stator have been subjected to different surface roughness treatments. The analysis is demonstrated for ...
NASA Center: NASA (non Center Specific)
Publication Year: 1984
Added to NTRS: 2004-11-03
Accession Number: 84A46896; Document ID: 19840064109; Report Number: ASME PAPER 84-GT-32
Analysis of eccentric annular incompressible seals. I - A new solution using fast Fourier transforms for determining hydrodynamic force
Author(s): Nelson, C. C.; Nguyen, D. T.
Abstract: A new analysis procedure is presented which solves for the flow variables of an incompressible-flow annular pressure seal in which the rotor has a large static displacement from the centered position. The analysis begins ...
NASA Center: NASA (non Center Specific)
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 88A23308; Document ID: 19880036081; Report Number: ASME PAPER 87-TRIB-52
Theory versus experiment for the rotordynamic coefficients of annular gas seals. Part 2: Constant clearance and convergent-tapered geometry
Author(s): Nelson, C. C.; Childs, D. W.; Nicks, C.; Elrod, D.
Abstract: The leakage and rotordynamic coefficients of constant-clearance and convergent-tapered annular gas seals were measured in an experimental test facility. The results are presented along with the theoretically predicted ...
NASA Center: NASA (non Center Specific)
Publication Year: 1985
Added to NTRS: 2004-11-03
Accession Number: 85N19416; Document ID: 19850011106; Report Number: NAS 1.26:174413, NASA-CR-174413
Analysis of eccentric annular incompressible seals. II - Effects of eccentricity on rotordynamic coefficients
Author(s): Nelson, C. C.; Nguyen, D. T.
Abstract: A new analysis procedure has been presented which solves for the flow variables of an annular pressure seal in which the rotor has a large static displacement (eccentricity) from the centered position. The present paper ...
NASA Center: NASA (non Center Specific)
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 88A23309; Document ID: 19880036082; Report Number: ASME PAPER 87-TRIB-53
A comparison of experimental and theoretical results for rotordynamic coefficients of four annular gas seals
Author(s): Childs, D. W.; Nelson, C. C.; Elrod, D.; Nicks, C.
Abstract: The test facility and initial test program developed to experimentally measure the fluid forces induced by annular gas seals is described. A comparison of theoretically predicted and experimentally obtained data for smooth ...
NASA Center: NASA (non Center Specific)
Publication Year: 1985
Added to NTRS: 2004-11-03
Accession Number: 85N32332; Document ID: 19850024019; Report Number: NAS 1.26:176086, NASA-CR-176086, TRC-SEALS-5-85
Rotordynamic coefficients for compressible flow in tapered annular seals
Author(s): Nelson, C. C.
Abstract: Derivation of the governing equations for compressible flow in a tapered annular seal is based on Hirs' turbulent bulk-flow model. Zeroth and first-order perturbation equations are developed by an expansion in the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1985
Added to NTRS: 2004-11-03
Accession Number: 85A42573; Document ID: 19850060422
Comparison of Hirs' equation with Moody's equation for determining rotordynamic coefficients of annular pressure seals
Author(s): Nelson, C. C.; Nguyen, D. T.
Abstract: The rotordynamic coefficients of an incompressible-flow annular pressure seal were determined using a bulk-flow model in conjunction with two different friction factor relationships. The first, Hirs' equation, assumes the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1986
Added to NTRS: 2004-11-03
Accession Number: 87A19529; Document ID: 19870032255; Report Number: ASME PAPER 86-TRIB-19
An annular gas seal analysis using empirical entrance and exit region friction factors
Author(s): Elrod, D. A.; Childs, D. W.; Nelson, C. C.
Abstract: Wall shear stress results from stationary-rotor flow tests of five annular gas seals are used to develop entrance and exit region friction factor models. The friction factor models are used in a bulk-flow seal analysis which ...
NASA Center: NASA (non Center Specific)
Publication Year: 1990
Added to NTRS: 2004-11-03
Accession Number: 90A33555; Document ID: 19900046500; Report Number: ASME PAPER 89-TRIB-46
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