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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 15:21:50 +0000Rotordynamic Forces Generated by Discharge-to-Suction Leakage Flows in Centrifugal Pumps
https://resolver.caltech.edu/CaltechAUTHORS:GUIaetopt90
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'A.'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'C. E.'}}, {'id': 'Acosta-A-J', 'name': {'family': 'Acosta', 'given': 'A. J.'}}, {'id': 'Caughey-T-K', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1990
This paper reviews the current state of knowledge of rotordynamic forces caused by the discharge-to-suction leakage flows in centrifugal pumps. The indications that these flows could contribute significantly to the rotordynamics motivated the fabrication of an experiment in which measurements of rotordynamic forces would be made on simulated leakage flows in which the flow rate, clearance, eccentricity and other parameters would be exercised in order to understand the phenomena. Sample data is presented and demonstrates substantial rotordynamic effects which could be potentially destabilizing. The rotordynamic forces appear to be inversely propertional to the clearance and change significant with the flow rate.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/p813q-r5738Measurements for the rotordynamic shroud forces for centrifugal pumps
https://resolver.caltech.edu/CaltechAUTHORS:GUI108
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'A.'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'C. E.'}}, {'id': 'Acosta-A-J', 'name': {'family': 'Acosta', 'given': 'A. J.'}}, {'id': 'Caughey-T-K', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1990
An experiment was designed to measure the rotordynamic shroud forces on a centrigual pump impeller. The measurements were doen for various whirl/impeller ratios and for different flow rates. A destabilising tangential force was measured for small positive whirl ratios and this force decreased with increasing flow rate.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/vffkf-r3c21The Effect of Inlet Swirl on the Rotordynamic Shroud
Forces in a Centrifugal Pump
https://resolver.caltech.edu/CaltechAUTHORS:20120105-103828941
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'A.'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'C. E.'}}, {'id': 'Acosta-A-J', 'name': {'family': 'Acosta', 'given': 'A. J.'}}, {'id': 'Caughey-T-K', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1992
The role played by fluid forces in determining the
rotordynamic stability of a centrifugal pump is gaining
increasing attention. The present research investigates
the contributions to the rotordynamic forces from the
discharge-to-suction leakage flows between the front
shroud of the rotating impeller and the stationary pump
casing. In particular, the dependency of the rotordynamic
characteristics of leakage flows on the swirl at the inlet to
the leakage path was examined . An inlet guide vane was
designed for the experiment so that swirl could be
introduced at the leakage flow inlet. The data demonstrates
substantial rotordynamic effects and a destabilizing
tangential force for small positive whirl ratios; this force
decreased with increasing flow rate. The effect of swirl on
the rotordynamic forces was found to be destabilizing.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/85v3n-bq611Model predictions and experimental results for the rotordynamic characteristics of leakage flows in centrifugal pumps
https://resolver.caltech.edu/CaltechAUTHORS:20111226-134646361
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'Adiel'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'Christopher E.'}}]}
Year: 1993
The role played by fluid forces in determining the rotordynamic
stability and characteristics of a centrifugal pump is gaining
increasing attention. The present research investigates the contributions
to the rotordynamic forces from the discharge-to-suction
leakage flows between the front shroud of the rotating impeller and
the stationary pump casing. An experiment was designed to measure
the rotordynamic shroud forces due to simulated leakage
flows for different parameters such as flowrate, shroud clearance,
face seal clearance, and eccentricity. The functional dependence
on the ratio of whirl frequency to rotating frequency (termed the
whirl ratio) is very similar to that measured in experiments and
similar to that predicted by the theoretical work of Childs [1].
Childs' bulk flow model yielded some unusual results including
peaks in the rotordynamic forces at particular positive whirl ratios,
a phenomenon which Childs tentatively described as a "resonance"
of the leakage flow. This unexpected phenomenon developed
at small positive whirl ratios when the inlet swirl velocity
ratio exceeds about 0.5. Childs points out that a typical swirl
velocity ratio at inlet (pump discharge) would be about 0.5 and
may not, therefore, be large enough for the resonance to be
manifest. To explore whether this effect occurs, an inlet guide vane
was constructed which introduced a known amount of swirl into
the flow upstream of the leakage flow inlet. A detailed comparison
of model predictions with the present experimental program is
presented. The experimental results showed no evidence of the
"resonances," even at much larger swirl inlet velocities than
explored by Childs.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/0bjzd-ecw25The Effect of Inlet Swirl on the Rotordynamic Shroud Forces in a Centrifugal Pump
https://resolver.caltech.edu/CaltechAUTHORS:GUIjegtp93
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'A.'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'C. E.'}}, {'id': 'Acosta-A-J', 'name': {'family': 'Acosta', 'given': 'A. J.'}}, {'id': 'Caughey-T-K', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1993
The role played by fluid forces in determining the rotordynamic stability of a centrifugal pump is gaining increasing attention. The present research investigates the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. In particular, the dependency of the rotordynamic characteristics of leakage flows on the swirl at the inlet to the leakage path was examined. An inlet guide vane was designed for the experiment so that swirl could be introduced at the leakage flow inlet. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl ratios: this force decreased with increasing flow rate. The effect of swirl on the rotordynamic forces was found to be destabilizing.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/qeykk-0dd18Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps
https://resolver.caltech.edu/CaltechAUTHORS:GUIjfme94
Authors: {'items': [{'id': 'Guinzburg-A', 'name': {'family': 'Guinzburg', 'given': 'A.'}}, {'id': 'Brennen-C-E', 'name': {'family': 'Brennen', 'given': 'C. E.'}}, {'id': 'Acosta-A-J', 'name': {'family': 'Acosta', 'given': 'A. J.'}}, {'id': 'Caughey-T-K', 'name': {'family': 'Caughey', 'given': 'T. K.'}}]}
Year: 1994
In recent years, increasing attention has been give to fluid-structure interaction problems in turbomachines. The present research focuses on just one such fluid-structure interaction problem, namely, the role played by fluid forces in determining the rotordynamic stability and characteristics of a centrifugal pump. The emphasis of this study is to investigate the contributions to the rotordynamic forces from the discharge-to-suction leakage flows between the front shroud of the rotating impeller and the stationary pump casing. An experiment was designed to measure the rotordynamic shroud forces due to simulated leakage flows for different parameters such as flow rate, shroud clearance, face-seal clearance and eccentricity. The data demonstrate substantial rotordynamic effects and a destabilizing tangential force for small positive whirl frequency ratios; this force decreased with increasing flow rate. The rotordynamic forces appear to be inversely proportional to the clearance and change significantly with the flow rate. Two sets of data taken at different eccentricities yielded quite similar nondimensional rotordynamic forces indicating that the experiments lie within the linear regime of eccentricity.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/dweye-m5w71