Abstract
In recent years, Particle Image Velocimetry (PIV) is being recognized as one of the effective flow measurement methods to investigate the flow field in detail. On the other hand, a performance prediction at off-design point as well as design point using computational fluid dynamics (CFD) also comes to be possible with the advance of the computer technology. In this report, the internal flow field in a mixed-flow pump at the performance instability point was investigated using PIV and comparing with the CFD result. As a result, the recirculation flow that reached to the trailing edge around the suction side of impeller blades was observed.
