The Effect of Volute Tongue and Passage Configuration On The Performance of Centrifugal Fan

摘要

The performance and flow stability of centrifugal fans is influenced considerably by the design of the volute passage and tongue at the re-circulation port. In this study the performance of a fan in conjunction with four alternative volute designs has been investigated. The alternative volutes include a modified passage design and the application of a rounded tongue leading edge at the re-circulation port. The effect of these volute configurations on the fan and volute performance was examined by the precise measurement of flow at volute inlet and near the volute tongue. From the test results it was found that the modified volute designs led to an improvement in fan performance, however the onset of flow instability occurred at increased flow rates.