The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation
- Other:
- Cooper, P.
Abstract
An experiment in forced vibration was conducted to study the fluid-induced rotordynamic force on an impeller whirling along a trajectory eccentric to its undeflected position. The prescribed whirl trajectory of the rotor is a circular orbit of a fixed radius. The force measured is a combination of a steady radial force due to volute asymmetries and an unsteady force due to the eccentric motion of the rotor. These measurements have been conducted over a full range of whirl/impeller speed ratios at different flow coefficients for various turbomachines. A destabilizing force was observed over a region of positive whirl ratio. The range of flow conditions examined for a centrifugal impeller in a spiral volute has been enlarged to include cavitation. Compared to the non-cavitating condition, cavitation corresponding to a head loss of three percent did not have a significant effect upon the unsteady force.
Additional Information
The authors are indebted to the NASA George Marshall Space Flight Center, for continued sponsorship of this research under contract NAS8-33108. One of the authors (R. Franz) would like to thank the Shell Foundation for providing a fellowship that supported his graduate studies.Attached Files
Published - FRA096.pdf
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Additional details
- Eprint ID
- 210
- Resolver ID
- CaltechAUTHORS:FRAasmespm89
- NASA
- NAS8-33108
- Shell Foundation
- Created
-
2004-12-10Created from EPrint's datestamp field
- Updated
-
2019-10-02Created from EPrint's last_modified field
- Series Name
- Fluids Engineering Division
- Series Volume or Issue Number
- 81