Abstract
The cross flow fan has an eccentrically located vortex inside impeller. The vortex behavior has a large effect on the fan performance and fan noise. Although investigations on the internal flow of cross flow fan have been performed by many researchers, quantitative relationship between the eccentrically located vortex and fan noise is not sufficiently made clear. In our previous study, we developed a noise reduction method of cross flow fan by using a step tongue and a skew tongue. Unfortunately, a detailed mechanism of fan noise reduction is not known yet. In this paper the flow pattern and the fan noise of cross flow fan are experimentally and numerically examined.
