Prediction of Aerodynamic Noise for Centrifugal Fan of Air-Conditioner by Tetra-Prism Grids

Volume 3B: Fluid Applications and Systems Pub Date : 2019-07-28 DOI:10.1115/ajkfluids2019-4638

T. Iwase, D. Sato, H. Obara, Y. Yamade, C. Kato

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引用次数: 1

Abstract

We calculated fan performance and aerodynamic noise in the centrifugal fan of air conditioner by large eddy simulation (LES). In this study, we investigated simulation technology employing tetra-prism grids for practical usefulness. Tetraprism grids are easier to generate than hexahedral grids. We employed the numerical simulation code FrontFlow/blue (FFB) throughout the LES. First, we proposed a design method for tetra-prism grids. The design method featured a predicted boundary layer thickness that was the same as the thickness of a prism layer. Next, we compared calculated results for the 13 million grids, 107 million grids and 860 million grids to investigate the grid number influence on fan performance and aerodynamic noise. We confirmed that calculated results for larger number of grids was more accurate than smaller number of grids. We also confirmed that calculated results simulated streaks well and the number of streaks increased in the order of the increasing number of the grids. The proper simulating of the streaks therefore contributed to getting better calculated results. As a result, we confirmed that using the tetra-prism grids was practical in the actual development of fans.

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四棱柱网格法预测空调离心风机气动噪声

采用大涡模拟的方法对空调离心风机的风扇性能和气动噪声进行了计算。在这项研究中，我们研究了采用四棱柱网格的模拟技术的实用性。四面体网格比六面体网格更容易生成。我们在整个LES中使用了数值模拟代码FrontFlow/blue (FFB)。首先，提出了一种四棱柱网格的设计方法。该设计方法的特点是预测边界层厚度与棱镜层厚度相同。接下来，我们比较了1300万格、1.07亿格和8.6亿格的计算结果，研究了格数对风扇性能和气动噪声的影响。我们证实了较大网格数的计算结果比较小网格数的计算结果更准确。我们也证实了计算结果很好地模拟了条纹，条纹的数量按网格数量的增加顺序增加。因此，对条纹进行适当的模拟有助于得到较好的计算结果。因此，我们确认在风扇的实际开发中使用四棱柱网格是可行的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Volume 3B: Fluid Applications and Systems

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