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contributor authorJ. M. Darden
contributor authorG. T. Flowers
contributor authorAssoc. Professor
contributor authorE. M. Earhart
date accessioned2017-05-09T00:04:44Z
date available2017-05-09T00:04:44Z
date copyrightOctober, 2001
date issued2001
identifier issn1528-8919
identifier otherJETPEZ-26807#857_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/125146
description abstractAnnular seals are known to enhance rotordynamic stability margins and minimize vibration response levels in high-speed rotating machinery. Theoretical predictions for the rotordynamic characteristics of annular seals exist but additional experimental data is needed to properly anchor these results. NASA’s Marshall Space Flight Center (MSFC) has developed an annular seal test rig and facility to experimentally characterize axially fed annular seals. Annular seals with deliberately roughened stators (i.e., damping seals) have been shown analytically to increase stability margins of rocket engine turbomachinery by reducing the seal’s whirl frequency ratio. The capabilities of MSFC’s annular seal test rig have been enhanced to allow high fluid inlet preswirl testing that is more representative of actual turbopump seal boundary conditions. The purpose of this paper is to describe the effect of this realistic preswirl on the stabilizing capability of both damping and smooth seals. Centered seal results are presented for both a smooth annular seal and a damping seal. These results were obtained for a range of seal pressure differentials, shaft rotational speeds, and two levels of inlet fluid preswirl.
publisherThe American Society of Mechanical Engineers (ASME)
titleComparison of the Dynamic Characteristics of Smooth Annular Seals and Damping Seals
typeJournal Paper
journal volume123
journal issue4
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.1383256
journal fristpage857
journal lastpage863
identifier eissn0742-4795
keywordsDamping
keywordsTesting
keywordsWhirls
keywordsStiffness
keywordsFluids AND Pressure
treeJournal of Engineering for Gas Turbines and Power:;2001:;volume( 123 ):;issue: 004
contenttypeFulltext


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