Abstract
The noise emitted by the impeller is mainly produced through the pressure fluctuations of impeller and cut-off surface. In this study, it is attempted to minimize the high tonal sound generated by impeller– surface interaction of a backward-curved centrifugal fan. Firstly, the aero-acoustic performance of the two impellers with flat and curved shroud plates is compared inside the fan with the original cut-off. Secondly, the effects of using an open-cell metal foam (OCMF) on the cut-off for both mentioned impellers is examined. From the experimental investigations, it is shown that the impeller with curved shroud plate reduces RMS pressure around 11.7 dB compared to the flat shroud plate. Moreover, employing the OCMF layer (20ppi) on the surface of the cut-off can reduce the RMS pressure around 10.5 dB without significantly reducing outlet flow rate. In general, the modifications are reduced the fan noise by up to 13.7 dB at maximum RPM.
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