1011 The Noise Generating Mechanism of a Wing Profile Centrifugal Blower : The measurement of turbulent flow around the blade

Abstract

In this study, we investigated the relationship between the turbulent flows around and fluid noise from the blade of a centrifugal blower by the visualization experiment using smoke and PIV analysis. The visualization on the different cross-sections in axial direction of the impeller found that in the cross-section near the main plate of the impeller, the flow around a blade mainly flows to the radial direction, whereas in the middle cross-section between the main plate and side plate, the flow following the trailing edge of the blade occurs and the flow generates the vortices and the turbulence which causes the fluid noise.