Noise reduction in cavity flow by addition of porous media

投稿的翻译标题: 基于多孔介质填充的空腔流动降噪

Ruqian Guo, Xiaopeng Chen, Zhenhua Wan, Haibao Hu, Shuai Cui

科研成果: 期刊稿件文章同行评审

8 引用 (Scopus)

摘要

Self-sustained oscillation and the sound radiation of flow over an open cavity is of great importance in nature and industry. Influences of filled porous media in the cavity are investigated numerically by using a lattice Boltzmann method in two-dimensional space. It is shown that the outcomes of the porous patch depend on the location of the patch and the original flow mode, namely shear layer (SL) and wake mode (WM). For SL flow, the porous patch either damps the vortical flow or suppresses the generation of the secondary vortex sheet on the wall. The later effect destabilizes the SL. Consequently, the radiated sound is reduced as the patch is on the trailing edge, and increased with porous patch on the floor, respectively. For flow in WM, a transition from WM to SL mode is found when the porous ctherefore, the WM flow is not sustained. On the other hand, the porous patch on the trailing edge slightly weakens the sound due to dissipation. The study shows that assembling of porous media in the flow field decreases the radiated sound level only if it is done carefully.

投稿的翻译标题基于多孔介质填充的空腔流动降噪
源语言英语
文章编号321358
期刊Acta Mechanica Sinica/Lixue Xuebao
38
2
DOI
出版状态已出版 - 2月 2022

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