An Analysis of Impeller and Volute Losses in Centrifugal Fans

The measured losses from tests on five centrifugal fan impellers of different blade angle, running at constant speed in a given volute, are analysed. Impeller and volute losses, expressed as a fraction of the dynamic exit pressure relative to impeller and volute respectively, are correlated with a diffusion factor over a wide volume flow range. The results are applied to other impellers and volutes.The low volume flow range of operation is also considered.