Abstract
The pressure fluctuations and the radial fluid forces induced by rotor-stator interaction in a centrifugal pump were measured and their relations were investigated. Experiments were done for different diffuser vanes, flow rates, and rotating speeds. It was demonstrated that both the blade pressure fluctuations and the volute static pressures are non-uniform circumferentially (not axisymmetric) under off design operating conditions and that the two have a strong relation. At high flow rates, the interaction induced blade pressure fluctuations are large in areas where the volute static pressure is low. The propagating directions of the rotating pressure fluctuations, the whirling directions of the radial fluid forces acting on the impeller, and the dominant frequency components of both the fluctuations and the fluid forces are discussed. When measuring fluid forces in the rotating frame, other frequency components, in addition to those related to the products of the diffuser vane number and the rotating frequency, may occur due to the circumferential unevenness of the pressure fluctuations.
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