Theoretical Study of Fluid Forces on a Centrifugal Impeller Rotating and Whirling in a Volute

Creators: Tsujimoto, Y.; Acosta, A. J.; Brennen, C. E.

Abstract

Fluid forces on a rotating and whirling centrifugal impeller in a volute are analyzed with the assumption of a two-dimensional rotational, inviscid flow. For simplicity, the flow is assumed to be perfectly guided by the impeller vanes. The theory predicts the tangential and the radial force on the whirling impeller as functions of impeller geometry, volute spacing, and whirl ratio. A good qualitative agreement with experiment is found.

Additional Information

between the forces on the 3-D and 2-D impellers in the volute is on a Centrifugal Impeller Rotating and Whirling in a Volute Fluid forces on a rotating and whirling centrifugal impeller in a volute are analyzed with the assumption of a two-dimensional rotational, inviscid flow. For simplicity, theflow is assumed to be perfectly guided by the impeller vanes. The theory predicts the tangential and the radial force orfthe whirling impeller as functions of impeller geometry, volute spacing, and whirl ratio. A good qualitative agreement with experiment is found. Contributed by the Technical Committee on Vibration and Sound for publication in the Journal of Vibration, Acoustics, Stress, and Reliability in Design. Manuscript received July 30, 1986. The authors are grateful for the support by the National Aeronautics and Space Administration under Contract NAS8-33108. One of the authors (Y.T.) would like to thank also Yamada Science Foundation for their financial support for his stay at Caltech. His acknowledgments are also to Professor K. Imaichi and Dr. O. Furuya for their continued encouragement, to Mr. M. Hirao for his support in numerical calculations, and to the people in Caltech for their warm hospitality and friendships.

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