1718 A Similarity of Rotordynamic Fluid Forces : Impeller/Diffuser Rotating Stall and Rotating Cavitation

Abstract

Rotordynamic fluid forces coupled with flow instabilities (i.e., impeller/diffuser rotating stall and rotating cavitation) in turbomachines were examined. Variations of fluid forces arisen from the rotating instabilities have the similar characteristics in rotating stall and cavitation. The phase of the fluid force vector changes by π around the natural frequency of flow instabilities.