Reduction of the aerodynamic tonal noise of a forward-curved centrifugal fan by modification of the volute tongue geometry

Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

“…After that, Ohta et al applied a hybrid-type noise control method to reduce the tonal noise of a BC centrifugal fan [18,19]. Recently, Velarde-Suárez et al reported that a modification of the volute tongue geometry was successfully applied to reduce the aerodynamic tonal noise of an FC multi-blade fan [20]. Increasing impeller-tongue clearance and inclining volute tongue are the widely used methods for centrifugal fan noise control.…”

A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans

“…With the development of society and people's awareness of environmental protection, the requirements for fans are becoming increasingly high, and noise problems have become the focus of research in recent years. Whether the noise of a car's engine, a power plant's wind turbine, a construction site's blower, or a home's exhaust fan, there is no doubt that fan noise has a major impact [10]. The negative effects of aerodynamic noise have become increasingly evident as the speed of working parts increases.…”

Experimental on the Performance of Centrifugal Fan with Limited Size by Changing the Openness Distribution

“…The experimental results show that the method using "constant mean velocity" is optimal in fan's performance. Sandra Velarde-suárez et al [4,5] studied the influent of the volute tongue geometry on the aeroacoustic behavior of a squirrel-cage fan. But, in the case of limited space, the existing design methods of volute casing cannot meet the demand of the performance of the fan.…”