Book Section records
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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 13:39:55 +0000Measurements 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.edu/records/vffkf-r3c21Model 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.edu/records/0bjzd-ecw25