クロスフローファンの騒音低減法の開発と内部流れの可視化

概要

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Cross flow fans have extensive industrial applications, from air conditioning and ventilation to agricultural sprayers, as well as a wide variety of heat transfer applications. This fan is a unique type of fan with an eccentric vortex inside impeller which produces high pressure coefficient. However, some problems are not yet solved completely about the effects of fan geometry on the performance. The position and the circulation of the vortex are affected by the casing configuration of the fan. The vortex behavior has a large effect on the fan performance and fan noise level. In this paper a method of noise reduction of cross flow fan is experimentally investigated. The method involves varying the geometry of the dividing tongue through slight alterations in position and⁄or the introduction of axial variations in the tongue geometry. The visualization studies undertaken to ascertain the mechanism of the observed noise reduction is accomplished.
日本実験力学会の論文