Unsteady simulation of tonal noise from isolated centrifugal fan

Unsteady simulation of tonal noise from isolated centrifugal fan
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孤立离心风机音调噪声的非定常模拟

DOI：
10.31224/osf.io/yx7rj
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发表时间：
2020
期刊：
--
影响因子：
--
通讯作者：
L. Davidson
L. Davidson
中科院分区：
--
文献类型：
--
作者：
M. Ottersten;H. Yao;L. Davidson

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本研究以一孤立离心式风扇为研究对象，利用RANS与URANS数值模拟，探讨其气动与声学特性。通过耦合URANS和Ffowcs威廉姆斯和霍金声学类比来预测噪声。RANS和URANS计算结果与实验数据吻合较好。预测了叶片通过频率处的噪声幅值。在围带和叶片后缘之间观察到回流，回流是降低风扇效率和增加噪音的原因。结果表明，回流与围带与进气道之间的差距有关。
In this study, an isolated centrifugal fan is investigated for the aerodynamic and acoustic performances usingRANS and URANS simulations. The noise is predicted by coupling the URANS and the Ffowcs Williams andHawkings acoustic analogy. The aerodynamic properties obtained from RANS and URANS are consistentwith the experimental data. The magnitudes of the tonal noise at the blade passing frequencies are wellpredicted. Recirculating flows, which are responsible for reducing the fan efficiency and increasing the noisegeneration, are observed between the shroud and the blade trailing edges. It is found that the recirculatingflows are associated with the gap between the shroud and the inlet duct.