| dc.contributor |
Vance , John M . |
|
| dc.creator |
Gamal Eldin , Ahmed Mohamed |
|
| dc.date |
2004 -09 -30T01 :40 :16Z |
|
| dc.date |
2004 -09 -30T01 :40 :16Z |
|
| dc.date |
2003 -12 |
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| dc.date |
2004 -09 -30T01 :40 :16Z |
|
| dc.date.accessioned |
2013 -03 -12T17 :36 :19Z |
|
| dc.date.available |
2013 -03 -12T17 :36 :19Z |
|
| dc.date.issued |
2013 -03 -12 |
|
| dc.identifier |
http : / /hdl .handle .net /1969 .1 /16 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /1969 .1 /16 |
|
| dc.description |
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 . |
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| dc.format |
743412 bytes |
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| dc.format |
176025 bytes |
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| dc.format |
electronic |
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| dc.format |
application /pdf |
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| dc.format |
text /plain |
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| dc.format |
born digital |
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| dc.language |
en _US |
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| dc.publisher |
Texas A &M University |
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| dc.subject |
Pocket Damper Seal |
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| dc.subject |
Seal |
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| dc.subject |
Vibration |
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| dc.subject |
Rotor |
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| dc.subject |
Rotordynamic |
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| dc.subject |
Turbomachine |
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| dc.subject |
Leakage |
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| dc.subject |
Stiffness |
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| dc.subject |
Compressor |
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| dc.title |
Analytical and experimental evaluation of the leakage and stiffness characteristics of high pressure pocket damper seals |
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| dc.type |
Book |
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| dc.type |
Thesis |
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| dc.type |
Electronic Thesis |
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| dc.type |
text |
|