Abstract
The effects of diffuser outlet blockage using a damper ring on rotating stall in a vaneless radial diffuser were experimentally investigated. The main results are as follows. As the outlet area decreases, the flow rate of stall onset moves to the lower flow rate side. The suppression effect on rotating stall by restricting the outlet area is not caused by changing the mean time values in the diffuser such as static pressure ratio and flow angle distribution in the range of 1≤r/ri≤1.61. The magnitude of rotating stall under the restricted condition becomes weak with decreasing amplitude and the frequency of its fluctuation decreases under the outlet condition BR≥0.5.
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