| 陈志响,季振林,马庆镇,陈国强,孟祥旗,张超.非均匀流条件下穿孔管消声器传递损失计算方法与特性分析[J].声学技术,2022,41(5):705~710 |
| 非均匀流条件下穿孔管消声器传递损失计算方法与特性分析 |
| Transmission loss calculation and performance analysis of perforated-tube mufflers with non-uniform flow |
| 投稿时间：2021-03-10 修订日期：2021-05-28 |
| DOI：10.16300/j.cnki.1000-3630.2022.05.011 |
| 中文关键词: 声学 穿孔管消声器 流动效应 有限元法 传递损失 |
| 英文关键词: acoustics perforated tube muffler flow effect finite element model (FEM) transmission loss |
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| 中文摘要: |
| 实际应用中的消声器通常具有比较复杂的内部结构，其内部流体速度分布不均匀，而且消声器内部的回流管路和穿孔元件使得消声器内部的流体流动更加复杂，其消声性能不可避免地受到流体流动的影响。为了计算非均匀流条件下穿孔管消声器的传递损失，应用计算流体力学(Computational Fluid Dynamics, CFD)软件FLUENT计算消声器内部的流场，然后将流体属性通过网格映射的方式转移到LMS Virtual Lab声学有限元模型中，并且选用不同的穿孔阻抗模型计算消声器的传递损失，计算结果与实验测量结果进行了比较。文章对消声器内部流场的流动特征也做了仔细地分析，并研究了气体流速对消声器传递损失的影响，随着气体流速的增加，消声器的传递损失会增大，共振峰的峰值会减小。 |
| 英文摘要: |
| Mufflers in practical engineering applications often contain complex internal components and the internal flow field is distributed unevenly. In addition, the flow-reversing pipes and perforated elements in the muffler further complicate the flow patterns. Therefore, the effect of non-uniform flow on acoustic attenuation performance of mufflers should be carefully studied. In order to calculate the transmission loss (TL) of muffler, the computational fluid dynamics (CFD) software FLUENT is used to capture the inner flow field, and then the fluid property data are imported to the acoustic finite element model of LMS Virtual Lab. The different perforated impedance models are adopted to calculate TL, and the numerical results are compared with the results of previously published experimental measurements. The characteristics of the flow inside muffler are studied in detail. Furthermore, the effect of flow velocity on the acoustic attenuation performance of muffler is investigated. It is concluded that for the studied muffler, increasing flow velocity raises the TL and lowers the resonance peaks. |
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