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Modelling of broadband noise radiated by an airfoil-application to an axial fan

机译:机翼应用到轴流风扇的宽带噪声辐射建模

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摘要

In this paper, a modelling of the broadband noise radiated by an axial subsonic fan is presented and validated. It is an extension of Amiet's model predicting the broadband noise generated by an isolated airfoil. Two sources are analysed, incident turbulence interaction noise and trailing edge noise. It shows the dominance of the leading edge noise. The broadband noise directivity for axial fans presents a main radiation lobe along the fan axis for both mechanisms. It was observed that the leading edge acoustic spectra feature is very sensitive to the turbulence length scale of the incident flow.
机译:本文提出并验证了轴向亚音速风扇辐射的宽带噪声的建模。它是Amiet模型的预测的扩展,该模型预测了孤立机翼产生的宽带噪声。分析了两种来源,即湍流相互作用噪声和后缘噪声。它显示了前沿噪声的优势。轴流风扇的宽带噪声方向性在这两种机制中均沿风扇轴呈现出主要的辐射波瓣。观察到,前沿声谱特征对入射流的湍流长度尺度非常敏感。

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