Control of thermoacoustic instability with a drum-like silencer
Control of thermoacoustic instability with a drum-like silencer
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用鼓状消音器控制热声不稳定性
DOI：
10.1016/j.jsv.2017.06.027
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发表时间：
2017
影响因子：
4.7
通讯作者：
Sun Xiaofeng
中科院分区：
文献类型：
--
作者：
Zhang Guangyu;Wang Xiaoyu;Li Lei;Jing Xiaodong;Sun Xiaofeng
本文提出了一种利用鼓形消声器控制热声不稳定性的新方法。结果表明，通过降低热声系统的频率，鼓形消声器可以抑制热声系统的不稳定性。纯反应式消声器是由柔性膜片和背腔组成的，通常被认为是一种在低频段有效工作而无气动损失的消声装置。在本研究中，消声器被开发在Rijke管，作为一种手段，降低系统的固有频率，从而改变系统的共振周期。本文采用传递单元法（TEM）来考虑声波与消声器柔性膜之间的相互作用。探讨了消声器各种可能的性能对热声系统增长率和谐振频率的影响。计算结果表明，对于消声器的某些特性，消声器的共振频率大大降低，非稳态放热与压力脉动之间的相位差增大。因此，不稳定性被抑制与一些耗散，不能控制其在原系统中的发作。因此，当阻尼较低但不为零时，利用该技术控制热声不稳定性是有效的。
Theoretical investigation is carried out by a novel method of controlling thermoacoustic instability with a drum-like silencer. It is shown that by decreasing the frequency of thermoacoustic system, the instability can be suppressed with the help of drum-like silencer. The purely reactive silencer, which is composed of a flexible membrane and a backing cavity, is usually known as a noise control device that works effectively in low frequency bandwidth without any aerodynamic loss. In present research, the silencer is exploited in a Rijke tube, as a means of decreasing the natural frequency of the system, and consequently changing the resonance period of the system. The “transfer element method” (TEM) is used to consider the interactions between the acoustic waves and the flexible membranes of the silencer. The effects of all possible properties of the silencer on the growth rate and resonance frequency of the thermoacoustic system are explored. According to the calculation results, it is found that for some properties of the silencer, the resonance frequencies are greatly decreased and then the phase difference between the unsteady heat release and the pressure fluctuation is increased. Consequently, the instability is suppressed with some dissipation that can not be able to control its onset in the original system. Therefore, when the damping is low, but not zero, it is effective to control thermoacoustic instability with this technique.