40002771511application/pdfExperiments were conducted to make clear the unsteady flow in a centrifugal fan operating in the state of rotating stall. The flow in the suction duct and the vaneless diffuser was measured. Interesting flow patterns, especially reverse flow from the vaneless diffuser to the suction duct, were made clear. Furthermore experiments were carried out with a fan from which the vaneless diffuser was removed. Rotating stall was observed in the fun without the vaneless diffuser
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