Flow Visualization around Axial Flow Fan Blades

Abstract

In this paper, we established a method of flow visualization around the wing of an axial fiow fan by use of a drum camera, which could measure the velocity distribution around the wing by overlapping the measurement results of the time-line and the stream-line obtained from the spark trace and the smoke wire respectively. In addition, we applied this method to two types of fans, which have different performances, in order to correlate the flow around the wing with the wing element efficiency. We also quantified the effect of tip vortex on the total fan noise.