Abstract
Flulid forces on a rotating centrifugal impeller in whirling motion were studied experimentally. A two-dimensional impeller installed in a parallel-waved vaneless diffuser was forced to circular orbital motion with various positive and negative angular speeds. The results showed that the fluid forces exert a damping effect on the rotor at most operationg conditions, but become excitatory when the impeller operates at partial discharge and rotates far faster than the whirl speed. The test result was compared with theoretical one and quantitative agreement was obtained especially in positive whirl. Fluid forces were also expressed in terms of mass, damping and stiffness matrices.
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