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Flow instabilities in transonic compressors include rotating stall and surge. Air Injection control has been demonstrated to be an effective strategy for actively suppressing rotating stall and surge. In industrial applications such as aero-engines, the implementation of air injection control schemes is constrained by factors such as the "cost" in terms of efficiency lost and availability...
This paper treats the flow instabilities in a mixed flow pump with a vaned diffuser. Test pump has a positive slope of a head-flow performance curve at 65% flow rate of BEP (Best Efficiency Point) because of a rotating stall. Dynamic Particle Image Velocimetry (PIV) and pressure fluctuation measurements are used for investigating the propagation mechanism of a rotating stall. It was found that unstable...
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