Abstract
The rotating stall of centrifugal compressors which often causes low frequency shaft vibration in high pressure compressors is experimentally examined. Pressure fluctuations of low specific speed centrifugal compressors with a vaneless diffuser are measured by pressure transducers. Rotating stall is caused by a vaneless diffuser. The critical inlet flow angle for rotating stall depends not only on diffuser width ratio b/r2 but also contraction ratio b/b2. An empirical prediction formula of critical flow angle for stall based on the Senoo method is derived.
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