This paper presents the physical measurements and analysis of data pertaining to rotating stall observed during testing at the GE fan test facility located at Rensselaer Polytechnic Institute. Although never detected in actual GE applications, the rotating stall was encountered while testing fan cooling blade prototypes used in electrical generators. The effects of this phenomenon on the flow rate and pressure rise across the fan are considered, along with the frequency content of the adjacent flows on either side of the fan. Further, the effects of the addition of flow constrictions before and after the fan on the behavior of the rotating stall are investigated.

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