PIV측정에 의한 원심 임펠러의 깃 없는 디퓨저에서의 유동특성

The flow characteristics in vaneless diffuser with a backswept radial impeller have been experimentally investigated according to the variation of discharge flow rate. Particle image velocimety(PIV) system was applied to measure velocity fields with several operating conditions and on some diffuser horizontal planes. Pressure transducers were installed on hub wall of the diffuser in order to analyze the pressure fluctuations and their corresponding velocity fields. The results show that the location of main flow center moves near hub side to shroud side as the flow rate decreases.