Noise reduction in cavity flow by addition of porous media

Noise reduction in cavity flow by addition of porous media
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通过添加多孔介质降低腔内流动的噪音

DOI:
10.1007/s10409-021-09043-c
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发表时间:
2022-01
影响因子:
3.5
通讯作者:
Cui Shuai
Cui Shuai
中科院分区:
工程技术2区
文献类型:
--
作者:
Guo Ruqian;Chen Xiaopeng;Wan Zhenhua;Hu Haibao;Cui Shuai

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开放腔体上流动的自持振荡和声辐射在自然和工业中具有重要意义。利用二维空间中的格子玻尔兹曼方法对腔体中填充多孔介质的影响进行了数值研究。结果表明,多孔补片的结果取决于补片的位置和原始流动模式,即剪切层(SL)和尾流模式(WM)。对于SL流,多孔补片要么阻尼涡流,要么抑制二次涡流的产生后者的影响使 SL 不稳定。因此,辐射声随着补片位于后缘而减小,而随着多孔补片位于地板上而增加。对于 WM 中的流动,当多孔补片设置在地板上或前墙后面时,会发现从 WM 到 SL 模式的转变。在这种情况下,由于多孔补片的存在,大范围的再循环流被显着阻挡,因此,WM 流动不持续。研究表明,流场中多孔介质的聚集只有在小心谨慎的情况下才能降低辐射声级。
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 patch is set either on the floor or behind the leading wall.In the cases,the recirculating flow on large scale is blocked significantly due to the porous patch,therefore,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.
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