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Excitation of thermoacoustic oscillations by small premixed flames

机译：小型预混火焰激发热声振荡

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摘要

Experiments have been carried out in which very small lean premixed flames closely representative of those formed by modern multiport domestic gas burners have been subjected to controlled acoustic perturbation. PLIF from CH has been used to visualise the flame response and the heat-release-rate fluctuations have been evaluated directly from the flame images. It is shown that small laminar flames can amplify the effects of acoustic velocity fluctuations by mechanisms that do not involve resonant heat loss to the burner and that the fluctuations in flame-front area are not adequately characterised by a Strouhal number alone. The measured transfer function is compared with the predictions of various analytical formulations and a new model of the flame oscillation is proposed which applies specifically to situations in which the design of the burner renders the flame base immobile.
机译：已经进行了实验，其中非常细小的贫油预混火焰已经过受控的声扰动，该预混火焰紧密地代表了现代多端口家用燃气燃烧器形成的火焰。来自CH的PLIF已用于可视化火焰响应，并且直接根据火焰图像评估了放热率波动。结果表明，较小的层流火焰可以通过不涉及燃烧器共振热损失的机制来放大声速波动的影响，并且仅通过斯托洛哈尔数不能充分表征火焰前沿区域的波动。将测得的传递函数与各种分析公式的预测值进行比较，并提出了一种新的火焰振荡模型，该模型特别适用于燃烧器设计使火焰底座无法移动的情况。

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