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首页> 外文期刊>Journal of Sound and Vibration >Stabilization of acoustic modes using Helmholtz and Quarter-Wave resonators tuned at exceptional points
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Stabilization of acoustic modes using Helmholtz and Quarter-Wave resonators tuned at exceptional points

机译：使用Helmholtz和四分之一波谐振器进行隔音模式的稳定化

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摘要

Acoustic dampers are efficient and cost-effective means for suppressing thermoacoustic instabilities in combustion chambers. However, their design and the choice of their purging air mass flow is a challenging task, when one aims at ensuring thermoacoustic stability after their implementation. In the present experimental and theoretical study, Helmholtz (HH) and Quarter-Wave (QW) dampers are considered. A model for their acoustic impedance is derived and experimentally validated. In a second part, a thermoacoustic instability is mimicked by an electro-acoustic feedback loop in a rectangular cavity, to which the dampers are added. The length of the dampers can be adjusted, so that the system can be studied for tuned and detuned conditions. The stability of the coupled system is investigated experimentally and then analytically, which shows that for tuned dampers, the best stabilization is achieved at the exceptional point. The stabilization capabilities of HH and QW dampers are compared for given damper volume and purge mass flow. (C) 2018 Elsevier Ltd. All rights reserved.
机译：声阻尼器是抑制燃烧室中热声稳定性的高效且经济效益的方法。然而，它们的设计和吹扫空气质量流量的选择是一个具有挑战性的任务，当一个人的目标是确保其实施后的热声稳定性。在目前的实验和理论研究中，考虑了Helmholtz（HH）和四分之一波（QW）阻尼器。衍生和实验验证的声阻抗的模型。在第二部分中，热声不稳定性被矩形腔中的电声反馈回路模仿，矩形腔内加入阻尼器。可以调整阻尼器的长度，从而可以研究系统进行调谐和损坏的条件。实验研究了耦合系统的稳定性，然后分析地示出了用于调谐阻尼器，在特殊点实现最佳稳定性。比较HH和QW阻尼器的稳定能力，给出阻尼容积和吹扫质量流量。 （c）2018年elestvier有限公司保留所有权利。

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