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Rotor-Stator Interaction in a Diffuser Pump

Arndt, N. and Acosta, A. J. and Brennen, C. E. and Caughey, T. K. (1989) Rotor-Stator Interaction in a Diffuser Pump. Journal of Turbomachinery, 111 (3). pp. 213-221. ISSN 0889-504X. http://resolver.caltech.edu/CaltechAUTHORS:ARNjt89

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Abstract

The interatction between impeller blades and diffuser vanes in a diffuser pump was investigated. Steady and unsteady pressure measurements were taken on the diffuser vanes, and the shroud wall of a vaned and a vaneless diffuser. Steady, unsteady, and ensemble-averaged unsteady data, as well as frequency spectra, are presented. The measurements were made for different flow coefficients, shaft speeds, and radial gaps between impeller blade trailing and diffuser vane leading edge (1.5 and 4.5 percent based on impeller discharge radius). The resulting lift on the vane, both steady and unsteady, was computed from the pressure measurements at midvane height. The magnitude of the fluctuating lift was found to be greater than the steady lift. The pressure fluctuations were larger on the suction side than on the pressure side attaining their maximum value, of the same order of magnitude as the total pressure rise across the pump, near the leading edge. Pressure fluctuations were also measured across the span of the vane, and those near the shroud were significantly smaller than those near the hub. The pressure fluctuations on the shroud wall itself were larger for the vaned diffuser than a vaneless diffuser. Lift, vane pressure, and shroud wall pressure fluctuations decreased strongly with increasing radial gap.


Item Type:Article
Additional Information:Contributed by the International Gas Turbine Institute and presented at the 33rd International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 5-9, 1988. Manuscript received by the International Gas Turbine Institute September 10, 1987. Paper No. 88-GT-55.
Record Number:CaltechAUTHORS:ARNjt89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ARNjt89
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34
Collection:CaltechAUTHORS
Deposited By: Christopher Brennen
Deposited On:27 Aug 2004
Last Modified:26 Dec 2012 08:38

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