Aeroacoustics of Pipe Systems with Closed Branches
Aeroacoustics of Pipe Systems with Closed Branches
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DOI：
10.1260/1475-472x.10.2-3.201
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发表时间：
2011-06
影响因子：
1
通讯作者：
D. Tonon;A. Hirschberg;J. Golliard;S. Ziada
中科院分区：
文献类型：
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作者：
D. Tonon;A. Hirschberg;J. Golliard;S. Ziada
本文研究了具有封闭支管的谐振管网中的流致脉动问题。在许多技术应用中观察到的这些脉动，已被确定为由沿沿着封闭分支的流动的不稳定性驱动的自持的航空声学振荡。流动引起的脉动的基本方面进行了讨论，特别注意的声源的描述。本文提出了一种预测自持振荡的单模模型，即“能量平衡”模型。该模型包括通过声源功率和声功率损失之间的平衡来评估系统的每个声学模式的振幅。这种预测方法的主要组成部分进行了讨论，这些是管网的声学行为的评价和声源和声损失的建模。为了讨论影响管网气动声学特性的参数，给出了几个显示自持振荡的管道系统的场和比例模型实例。最后，对一些防止自持振荡的措施进行了评述，并对今后的工作进行了展望。
Flow induced pulsations in resonant pipe networks with closed branches are considered in this review paper. These pulsations, observed in many technical applications, have been identified as self-sustained aeroacoustic oscillations driven by the instability of the flow along the closed branches. The fundamental aspects of the flow induced pulsations are discussed, with particular attention to the description of the sound sources. A single mode model for the prediction of the self-sustained oscillations is presented, the “energy balance”. This model consists of the evaluation of the amplitude of each acoustic mode of the system by means of a balance between the acoustic source power and the acoustic power losses. The main components of this prediction method are discussed; these are the evaluation of the acoustic behavior of a pipe network and the modeling of the sound sources and the acoustic losses. Several field and scale model examples of pipe systems displaying self-sustained oscillations are presented, in order to discuss the parameters influencing the aeroacoustic behavior of pipe networks. Finally some counter-measures for the prevention of self-sustained oscillations are reviewed and perspectives for future work are considered.