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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Influence of duct parameters on the acoustic wave generation
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Influence of duct parameters on the acoustic wave generation

机译：管道参数对声波产生的影响

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Purpose - This paper aims to determine the influence of geometrical features of the channel on the acoustic wave generation in a ducted cavity. The analysis is focussed on the effects of the change in the entrance length upstream the cavity and the height. The study is supposed to investigate boundary layer and acoustic wave parameters, and an attempt will be made to determine the correlation between the geometrical dimension and those parameters. Design/methodology/approach - Analysis is conducted with the aim of a computational fluid dynamics (CFD) tool and selected results are validated with experimental investigations. The influence of grid resolution and time discretization is analysed. Four different entrance lengths and height are investigated. Qualitative and quantitative comparison between cases is presented. Findings - The investigations prove the small influence of the entrance length on acoustic wave generation, but channel height due to wave reflection and interference inside of the cavity has a significant impact on wave frequency and sound pressure level. Channel height has also impact on generation and shape of the vortex created in the cavity inlet. Originality/value - The paper extends the knowledge of phenomena taking place in the ducted cavities. Results obtained from these investigations will be useful in designing new cooling techniques and in noise reduction. The CFD analysis makes it possible to determine the correlations between channel dimensions and SPL function and frequency of sound waves.
机译：目的 - 本文旨在确定通道的几何特征对管道腔中声波产生的几何特征的影响。分析集中在腔上游的入口长度变化的影响和高度。该研究应该研究边界层和声波参数，并且将尝试确定几何维度与这些参数之间的相关性。设计/方法/方法 - 通过计算流体动力学（CFD）工具进行分析，并通过实验研究验证了所选结果。分析了网格分辨率和时间离散化的影响。调查了四个不同的入口长度和高度。提出了案件之间的定性和定量比较。结果 - 调查证明了入射长度对声波产生的少量影响，但由于波反射和腔内的干涉引起的通道高度对波频和声压级具有显着影响。通道高度也影响腔入口中产生的涡流的产生和形状。原创性/值 - 该论文扩展了在管道腔内发生的现象知识。从这些调查获得的结果将用于设计新的冷却技术和降噪。 CFD分析使得可以确定信道尺寸和SPL功能与声​​波频率之间的相关性。

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