Abstract
Values of added mass of a vibrating centrifugal impeller were analyzed by using unsteady potential theory. Impeller operating in diffusers with one and two vanes was modeled and the fluid forces were calculated for vibrations in the x and y directions covering various frequencies. Results of fluid forces were converted to mass, damping, stiffness matrices by the Fourier integral and the method of least squares. Mean values of added mass of the impeller in the diffusers which were obtained from mass matrix were larger than those in vaneless diffuser and different for vibrations of x and y directions. It was clarified that the prediction of radial force as the sum the circulation induced lift on the orbiting impeller, and the centrifugal forces on the apparent mass of the impeller was available for the unsymmetrical boundary conditions.
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