Abstract
Internal flow in multi-blade centrifugal fan has been investigated with stereo-PIV measurement. A time mean flow structure in scroll casing has been reconstructed by traversing the interrogation section at several measuring locations. The sectional data to reconstruct three dimensional flow fields was acquired with the same spatial resolution as that of in-plane velocity. With these data, the fan efficiency and noise generation were discussed by comparing the stream-wise and cross sectional flows. Additionally, a passing flow between the blades has been observed with single PIV technique. The fluctuation in the passing flow shows the significant difference according to the fan driving modes.
