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首页> 外文期刊>Journal of Fluid Science and Technology >Quantitative flow imaging approach to flow-acoustic coupling in pipeline-cavity systems
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Quantitative flow imaging approach to flow-acoustic coupling in pipeline-cavity systems

机译：管道腔系统中流-声耦合的定量流成像方法

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This paper considers flow-induced pressure pulsations in engineering systems that involve a cavity mounted in a pipeline. These self-sustained oscillations pose substantial risk, as they can cause fatigue damage to the system and the associated acoustic pressure levels can be harmful to humans. This review focuses on experimental and semi-empirical methods of prediction of the acoustic response of pipeline-cavity systems, with specific emphasis on the description of the acoustic noise source and the interaction between the separated flow that exists in the vicinity of the cavity opening and three types of resonant acoustic modes that can be excited by the flow: longitudinal modes of the main pipeline, transverse modes of a side branch (deep cavity) and azimuthal modes of an axisymmetric cavity. Fundamental insight into the physical mechanism of excitation of the resonant acoustic modes provided by quantitative flow imaging is discussed. In particular, application of particle image velocimetry (PIV) for identifying and quantifying the features of the acoustic source is described for each type of the acoustic modes, along with the associated challenges and the limitations of applicability. Moreover, effects of the modifications of the system geometry on the acoustic response and the structure of the noise source are presented. The geometrical features considered in this paper include asymmetry of the main pipeline, splitter plates located in the vicinity of the opening of the cavity, and chamfers of the leading and the trailing edges of the cavity.
机译：本文考虑了工程系统中由流动引起的压力脉动，该工程系统涉及安装在管道中的空腔。这些自持的振荡会带来很大的风险，因为它们可能导致系统疲劳损坏，并且相关的声压级可能对人体有害。这篇综述着重于预测管道腔系统的声学响应的实验和半经验方法，特别着重于声学噪声源的描述以及存在于腔孔附近的分离流之间的相互作用。可以通过流动激发的三种共振声模：主管道的纵向模，侧支（深腔）的横向模和轴对称腔的方位模。讨论了由定量流成像提供的共振声模激发的物理机理的基本知识。特别是，针对每种类型的声学模式，以及相关的挑战和适用性局限性，描述了粒子图像测速（PIV）在识别和量化声源特征方面的应用。此外，还介绍了系统几何形状的修改对声学响应和噪声源结构的影响。本文考虑的几何特征包括主管道的不对称性，位于空腔开口附近的分隔板以及空腔前缘和后缘的倒角。

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