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The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation

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Title The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation
 
Creator Franz, R.
Acosta, A. J.
Brennen, C. E.
Caughey, T. K.
 
Subject Caltech Library Services
 
Description An experiment in forced vabration was conducted to study the fluid-induced rotordynamic force on an impeller whirling along a trajectory eccentric to its undeflected position in the presence of cavitation. 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 without cavitation 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. However, a lesser degree of cavitation at the design point increased the destabilizing force for a particular set of whirl ratios.
 
Date 1990-09
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://authors.library.caltech.edu/100/1/FRA103.pdf
Franz, R. and Acosta, A. J. and Brennen, C. E. and Caughey, T. K. (1990) The Rotordynamic Forces on a Centrifugal Pump Impeller in the Presence of Cavitation. Journal of Fluids Engineering, 112 (3). pp. 264-271. ISSN 0098-2202. http://resolver.caltech.edu/CaltechAUTHORS:FRAjfe90 <http://resolver.caltech.edu/CaltechAUTHORS:FRAjfe90>
 
Relation http://resolver.caltech.edu/CaltechAUTHORS:FRAjfe90
http://authors.library.caltech.edu/100/