Abstract
Velocity distributions near the outlet of a centrifugal compressor were measured by PIV for investigating the leakage flow changes by ring-type plasma actuators. The ring-type plasma actuator was attached on the casing's surface near the impeller tip. The rotating speed of the impeller was set at 500 rpm, 1,000 rpm, and 1,500 rpm. The peak-to-peak input voltage was set at 8kV, 10kV, and 11.7 kV, with a fixed frequency of 40 kHz. In all the rotating speeds, the velocity distributions with the plasma actuator off had a gradient that the velocity at the impeller tip side is lower than that at the impeller root side. Mitigation of the velocity gradient, which indicates the suppression of tip leakage flow, were found at the higher input voltage and lower rotating speed condition.
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