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On the Generation Mechanism of High Level Sound Generated in a Boiler and Heat Exchanger

机译：锅炉与换热器中高声产生的机理研究

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Boilers and heat exchangers are widely used in various plants such as power and chemical plants. However, unexpected high level sounds are generated when these plants are operated and it becomes a serious problem. This kind of problem is called acoustic resonance. In addition, it has been considered that resonance generates when the frequency of the vortex shedding behind the tube bank coincides with the natural frequency of the duct system. However, it has also been thought of as a self-sustained tone. In general, the self-excited phenomenon arises when the exciting energy becomes greater than the dissipating energy. In this paper, in order to clarify the mechanism of the self-sustained tone experimentally, we tried to find the origin of the instability by changing the number of tube rows and acoustic damping. As a result, it was found that the self-sustained tone generates when the number of tube rows increases and the acoustic damping decreases.
机译：锅炉和热交换器广泛用于各种工厂，例如发电厂和化工厂。然而，当操作这些设备时，会产生意想不到的高音，这成为一个严重的问题。这种问题称为声共振。另外，已经考虑到，当在管束后面脱落的涡流的频率与管道系统的固有频率一致时，会产生共振。但是，它也被认为是一种自我维持的语气。通常，当激发能量变得大于耗散能量时，就会出现自激现象。在本文中，为了通过实验阐明自持音的机理，我们试图通过改变管排数和声阻尼来找到失稳的根源。结果发现，当管排数增加而声阻尼减小时，产生自持音。

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