Non-linear phenomena occurring during the start-up process of a travelling-wave looped-tube thermoacoustic engine
Non-linear phenomena occurring during the start-up process of a travelling-wave looped-tube thermoacoustic engine
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DOI：
10.1177/0957650912454793
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Abdulrahman S. Abduljalil;Zhibin Yu;A. Jaworski
中科院分区：
文献类型：
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作者：
Abdulrahman S. Abduljalil;Zhibin Yu;A. Jaworski
本文研究了环管热声发动机的非线性启动过程。该发动机使用空气作为工作气体，并且具有约111 Hz的基频。据观察，平均压力和输入热功率是控制发动机启动行为的两个关键参数。当这些变化时，观察到一系列非线性瞬态现象，其中包括“开-关”效应、“鱼骨状”振荡（即准周期压力振幅突发，随后是准稳态）以及正常的平滑启动过程。实验表明，“鱼骨状”爆发是一种新的压力幅值增长模式。通过一系列的实验详细研究了平均压力、输入热功率和回热器类型对这种准周期振幅脉冲的影响。据观察，压力振幅突发的持续时间取决于加热功率和平均压力的组合。实验结果表明，回热器内的声场和温度场之间存在很强的相互作用。据认为，这些可以导致报告的准周期不稳定的行为的发动机。
This article reports the investigation of non-linear start-up processes in a looped-tube thermoacoustic engine. The engine utilises air as working gas, and has the fundamental frequency of around 111 Hz. It is observed that the mean pressure and the input heat power are the two key parameters controlling the start-up behaviour of the engine. When these are varied, a range of non-linear transient phenomena are observed, which include the ‘on–off’ effect, ‘fishbone-like’ oscillations (i.e. the quasi-periodic pressure amplitude bursts followed by a quasi steady state), and the normal smooth start-up process. The experiments show that the ‘fishbone-like’ bursts are a new mode of pressure amplitude growth. A series of experiments have been conducted to investigate in detail the influence of mean pressure, input heat power and regenerator type on the occurrence of such quasi-periodic amplitude bursts. It is observed that the duration of the pressure amplitude bursts depends on the combination of the heating power and the mean pressure. The observations suggest that there are strong interactions between the acoustic and temperature fields within the regenerator. It is thought that these can lead to the reported quasi-periodic unsteady behaviour of the engine.