Thermoacoustic instabilities constitute a major branch of combustion instabilities that are undesirable for combustion systems designed to work steadily. Such instabilities are a result of a strong coupling between the system acoustics and fluctuating heat generation. The acoustic fluctuations modulate the heat release and this in turn produces acoustic waves. A thermoacoustically unstable system may exhibit pressure fluctuations with an amplitude in the order of audible sound (in e.g. heating appliances) up to operating pressure levels (in e.g. rocket engines). These pressure fluctuations limit the operating range of the system or even cause structural damage and thus should be avoided or controlled.

中文翻译：

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Rijke燃烧器的固有热声模式及其与声模式的相互作用

热声不稳定性构成燃烧不稳定性的主要分支，这对于设计为稳定工作的燃烧系统是不希望的。这种不稳定性是系统声学与波动的热量产生强烈耦合的结果。声波起伏调节热量的释放，进而产生声波。热声不稳定的系统可能会出现压力波动，其幅度可听见的声音（例如，在加热设备中）达到工作压力水平（例如，火箭发动机）。这些压力波动会限制系统的工作范围，甚至会导致结构损坏，因此应避免或控制。