Analytical and experimental evaluation of the leakage and stiffness characteristics of high pressure pocket damper seals

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dc.contributor.advisor Vance , John M . en_US
dc.contributor.committeeMember Randall , Robert E . en_US
dc.creator Gamal Eldin , Ahmed Mohamed en_US
dc.date.accessioned 2004 -09 -30T01 :40 :16Z
dc.date.accessioned 2014 -02 -18T22 :28 :02Z
dc.date.available 2004 -09 -30T01 :40 :16Z
dc.date.available 2014 -02 -18T22 :28 :02Z
dc.date.created 2003 -12 en_US
dc.date.issued 2004 -09 -30T01 :40 :16Z
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /16
dc.description.abstract 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 on straight -through and diverging configurations of eight -bladed and twelve -bladed seals were used for code validation and for calculation of seal discharge coefficients . Higher than expected leakage rates were measured in the case of the twelve -bladed seal , while the leakage rates for the eight -bladed seals were predicted reasonably accurately . Results are presented for shake tests conducted on the seals at pressures of up to 1000 Psi (6 .90 MPa ) . Test variables included pressure drop across the seals and rotor speed . The experimentally obtained stiffness coefficients are compared to results of a rotordynamic damper seal code , which uses the corrected mass flow -rate calculation method . Results show that the code under -predicts the magnitude of the seal's stiffness for most test cases . However , general trends in the frequency dependency of the direct stiffness are more accurately predicted . The expectation of high values of negative stiffness in diverging seals is confirmed by the results , but the frequency at which the sign of the stiffness becomes positive is considerably lower than is predicted . In addition to presenting high -pressure test data , this thesis also attempts to provide some insight into how seal parameters can be modified to obtain desired changes in seal stiffness . en_US
dc.format.extent 743412 bytes
dc.format.medium electronic en_US
dc.format.mimetype application /pdf
dc.language.iso en _US en_US
dc.publisher Texas A &M University en_US
dc.subject Pocket Damper Seal en_US
dc.title Analytical and experimental evaluation of the leakage and stiffness characteristics of high pressure pocket damper seals en_US
dc.type Book en
dc.type.genre Electronic Thesis en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US

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Analytical and experimental evaluation of the leakage and stiffness characteristics of high pressure pocket damper seals. Available electronically from http : / /hdl .handle .net /1969 .1 /16 .

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