This paper reports an experimental investigation of the rotordynamic fluid force and moment on a centrifugal impeller with three types of wear-ring seals; i.e., a face seal and two types of toothed seals. The impeller is equipped with a vaneless diffuser. Rotordynamic fluid forces and moments on the impeller in whirling motion were measured directly by using four-axis force sensor. Unsteady pressures were measured at several locations in the diffuser. It was found that, (1) at low flow rate, the fluid force and fluid force moment become maximum at a certain whirling speed caused by a coupling between the whirl motion and vaneless diffuser rotating stall and (2) the seal geometry with axial seal affects the direction of the coupled fluid force relative to the direction of eccentricity through the change in the unsteady leakage flow due to the whirl.
Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division December 18, 2001; revised manuscript received April 9, 2003. Associate Editor: B. Schiavello.
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Yoshida, Y., Tsujimoto, Y., Morimoto, G., Nishida, H., and Morii, S. (October 7, 2003). "Effects of Seal Geometry on Dynamic Impeller Fluid Forces and Moments." ASME. J. Fluids Eng. September 2003; 125(5): 786–795. https://doi.org/10.1115/1.1598988
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