Rotating stalls in a centrifugal impeller/vaned diffuser system were studied experimentally. Experiments were carried out for various clearances between a 2-D impeller and 2-D vaned diffuser (a=20°: Z=18) to clarify the impeller and vaned diffuser interaction. The results showed that the interaction has large effects on rotating stalls of the impeller and/or the vaned diffuser. Various types of rotating stalls were observed: coupled rotating stall with smaller clearance, diffuser rotating stall with larger clearance, unstable diffuser rotating stall with intermediate clearance, and impeller rotating stall.
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Yoshida et al. (1990) studied this question.