Abstract
In recently constructed electric power plants, the forced draft fan (FDF), induced draft fan (IDF) and boost up fan (BUF) centrifugal fans and duct-systems have become larger in capacity and limited in space every year. As a centrifugal fan is enlarged, the diameter of the impeller is enlarged and its rotating speed is lowered. Therefore, there is an increasing tendency to generate a low frequency noise.5 In the case of an IDF or BUF, the rotating stall of the centrifugal fan frequently causes low frequency noise, since the inlet flow is often throttled during operation. If the hydrodynamic and acoustical characteristics are insufficient, a strong flow-induced vibration with low frequency noise is generated in the fan-duct system, and not only are problems caused in terms of structural strength, but also physical and physiological problems are induced due to low frequency noise.
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