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Investigation study on the flow-induced noise by winglet and shroud shape of an axial flow fan at an outdoor unit of air conditioner
Journal of Mechanical Science and Technology ( IF 1.6 ) Pub Date : 2020-07-08 , DOI: 10.1007/s12206-020-0617-2
Tae-Gyun Lim , Jae Hyuk Jung , Wan-Ho Jeon , Won-Gu Joo , Gaku Minorikawa

Axial flow fans of outdoor units are equipped with specially shaped winglets and shroud for reduction of the flow-induced noise. In this study, the unsteady state flow field and the characteristics of the flow-induced noise according to the application of the sweptback tip winglets and 30 % covered shroud in an axial flow fan of an outdoor unit of air conditioner were experimentally and numerically analyzed. To analyze the unsteady flow field, large eddy simulation (LES) reflecting the geometry of complicated outdoor unit was performed; and the LES results were used by simplified Ffowcs Williams and Hawkings (FW-H) equation in order to calculate the noise numerically. As a result, asymmetric flow characteristics inside the outdoor unit by the mount and the shape of blade tip and shroud were found to cause inconsistent movement of the tip leakage vortex, which was revealed to change the characteristics of the flow-induced noise.



中文翻译:

空调室外机轴流风机小翼和罩形流动引起的噪声的研究

室外机的轴流风机配备有特殊形状的小翼和导流罩,以减少流动引起的噪声。在这项研究中,通过对后掠式翼梢小翼和30%覆盖的护罩在空调室外机轴流风机中的应用,进行了非稳态流场和流致噪声的特性的实验和数值分析。为了分析非恒定流场,进行了反映复杂室外机几何形状的大涡模拟(LES)。LES结果由简化的Ffowcs Williams和Hawkings(FW-H)方程使用,以便数值计算噪声。结果是,

更新日期:2020-07-08
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