Browsing by Author "Childs, Dara W."
Now showing items 1-20 of 53
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James, Stephen M. (2011-08-08)The subject of this thesis is an extension of a two-dimensional, axisymmetric, Timoshenko-beam finite-element rotordynamic code to include a three-dimensional non-axisymmetric solid-element casing model. Axisymmetric beams ...
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Nguyen, Dung Thanh (Texas A&M University. Libraries, 1988)A new analysis procedure which solves for leakage, reactive force, and rotordynamic coefficients of eccentric annular liquid and gas pressure seals is presented in this dissertation. This analysis procedure is based on a ...
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Kim, Tae Ho (2009-05-15)Comprehensive modeling of gas foil bearings (GFBs) anchored to reliable test data will enable the widespread usage of GFBs into novel turbomachinery applications, such as light weight business aircraft engines, hybrid fuel ...
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Avendano Ovalle, Raul David (2011-10-21)Misalignment in turbomachinery has been commonly known to produce twotimes- running-speed (2N) response. This project aimed to investigate the source of the 2N vibration response seen in misaligned vibrating machinery ...
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Gamal Eldin, Ahmed Mohamed (Texas A&M University, 2004-09-30)This thesis presents numerical predictions for the leakage and direct stiffness coefficients of pocket damper seals. Modifications made to earlier flow-prediction models are discussed. Leakage and static pressure measurements ...
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Childs, Dara W.; Vance, John M. (Texas A&M University. Turbomachinery Laboratories, 1997)The possible negative or positive impact of annular seal on rotordynamics of compressors and steam turbines is discussed. The nature of destabilizing forces that can be developed by "seethrough" and interlocking labyrinths ...
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Childs, Dara W. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2014-09-30)According to one embodiment of the disclosure, an annular seal generally includes a hollow member having two ends and an inner surface. The hollow member has a number of depressions formed in and extending around its inner ...
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Childs, Dara W. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2015-09-08)According to an aspect of the disclosure, an annular seal generally includes a hollow member having two ends and an inner surface. The hollow member has a number of depressions formed in and extending around its inner ...
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Childs, Dara W. (United States. Patent and Trademark Office; Texas A&M University. Libraries, 2011-12-13)According to one embodiment of the disclosure, an annular seal generally includes a hollow member having two ends and an inner surface. The hollow member has a number of depressions formed in and extending around its inner ...
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Kumar, Dhruv Dileep (2011-10-21)The present work investigates the phenomena of whip and whirl for a rigid rotor contacting at two bearing locations. The idea originated from an anemometer consisting of a rotor with an elastically supported stator undergoing ...
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Bulk-Flow analysis for force and moment coefficients of a shrouded centrifugal compressor impeller Gupta, Manoj Kumar (Texas A&M University, 2005-08-29)An analysis is developed for a compressible bulk-flow model of the leakage path between a centrifugal compressor's impeller shroud and housing along the front and back side of the impeller. This is an extension of analysis ...
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Mehta, Naitik (2012-07-16)This research compares the leakage and rotordynamic characteristics of a slanted-tooth labyrinth seal to a conventional straight-tooth labyrinth. Detailed results comparing the rotordynamic coefficients and leakage parameters ...
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Kannan Srinivas, Bharathwaj (Texas A&M University, 2004-09-30)Experiments conducted at the Texas A&M Turbomachinery Laboratory and field applications have shown that pocket damper seals (PDS) can be used to suppress vibrations in compressors. A mathematical model is presented for the ...
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Dynamic and Static Characteristics of a Rocker-Pivot, Tilting-Pad Bearing with 50% and 60% Offsets. Kulhanek, Chris David (2012-02-14)Static performance and rotordynamic coefficients are provided for a rocker-pivot, tilting-pad journal bearing with 50 and 60 percent offset pads in a load-between-pad configuration. The bearing uses leading-edge-groove ...
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Rodriguez Colmenares, Luis Emigdio (Texas A&M University, 2004-09-30)This thesis provides experimental frequency dependent stiffness and damping coefficient results for a high-speed, lightly loaded, flexible-pivot tilting-pad bearing, with a load-on-pad configuration. Test conditions include ...
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Cusano, Domenic (Texas A&M University, 2006-08-16)Instantaneous wall-pressure data were recorded for a 25% eccentric whirling annular seal for rotor speeds of 1800RPM and 3600RPM, axial Reynolds numbers of 24000 and 12000, and whirl ratios of 0.1-1.0 following the procedure ...
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Zhang, Min (2017-11-01)This research documents the development of a 2-phase annular-seal stand (2PASS) in the Turbomachinery Laboratory at Texas A&M University to investigate the static and dynamic characteristics of annular seals operating under ...
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Rodrigues Rodrigues, Margarita (2009-05-15)Predictions are presented for a selected compressor using longer hole-pattern seals with L/D ratios from 0.5 to 2.5. Results were obtained for back-to-back and in-line compressors with the seal located at mid-span and at ...
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Kheireddin, Bassem A. (2010-10-12)Annular gas seal clearances were simulated with closely spaced parallel plates using a Flat?Plate tester. The device is designed to measure the pressure gradient along the test specimen. The main function of the Flat?Plate ...
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Childs, Dara W.; Norrbin, Clay S.; Phillips, Stephen (Turbomachinery Laboratories, Texas A&M Engineering Experiment Station, 2014)