Visualization Measurement and Numerical Analysis of Internal Flow in Cross-Flow Fan

Abstract

Measurements of the internal flow velocity distributions in a cross-flow fan were made by particle-tracking velocimetry (PTV). The flow paths (pathlines) were photographed using a digital camera and analyzed using a computer program developed by Tsurusaki and Urata (1989) in order to obtain the velocity distributions. From the velocity distributions, the vorticity distributions were calculated and the vorticity supply and diffusion in the eccentric vortex region was discussed based on an axisymmetric vortex model. A numerical simulation was carried out using a random walk model. The work done by the impeller was also discussed based on the measured velocity distributions.