Abstract
In order to clarify the mechanism of the occurrence of unstable characteristics of a high-specific-speed diagonal flow fan, detailed measurements of the internal flow fields ahead of and behind the rotor were performed using a hot wire probe. The behavior of the flow fields in the low flow range including rotating stall was mainly investigated and the characteristics of the rotating stall, namely, the rotational speed of the stall cell, the number of cells and the cell distribution were analized. The effects of tip clearance on the unstable characteristics and internal flow fields were also discussed based on the measured results.
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