補助舌部板法による翼通過周波数・多翼ファン騒音の低減化

概要

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In order to obtain high discharge pressure, of a multiblade fan assembled in a burner of a boiler for industrial use, a cut-off sheet has to be designed under a very narrow clearance. The fan is driven at high rotational speeds under the condition of heavy discharge load. Therefore, the levels of the blade passing frequency (BPF) and its harmonics are much higher than the level of the broad-band noise. In this paper, an additional method that utilizes an auxiliary cut-off sheet, that is, setting up a new partition wall at the cut-off point, is proposed to reduce the fan noise. By means of experimental analysis, the noise reduction mechanism and the effects of design conditions on the shape of the partition wall are established. As a result, the BPF noise and the broad-band noise are markedly decreased without degrading the discharge pressure performance.
1996-12-25