Abstract
Controlling centrifugal fan noise by modifying the design of the fan is very appealing because the cost could be considerably lower than for an in-duct silencer. Pressure drop, fouling, and other problems frequently associated with silencers can also be avoided. Previous attempts at modifying an existing centrifugal fan to control noise have often met with limited success. To reduce the cost of controlling blade passage tones in the community, modification of the induced draft (ID) fans at a power plant was evaluated. Model testing was conducted for ten different designs of the cutoff bar for the centrifugal fan. The noise reductions and fan efficiencies varied widely for six of the ten cutoff bars tested. The best design gave better noise reductions than expected and higher efficiencies at usual settings of the variable inlet vanes. The best cutoff bar design was installed (full scale) on one of the ID fans and fields tested. The noise reductions on the full-scale fan tests were better than obtained for the scale model tests. Results of both the model and full-scale tests are presented, compared, and discussed.
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