Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner
Impact of Swirl Fluctuations on the Flame Response of a Perfectly Premixed Swirl Burner
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DOI：
10.1115/gt2009-60100
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Thomas Komarek;W. Polifke
中科院分区：
文献类型：
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作者：
Thomas Komarek;W. Polifke
燃烧不稳定性是燃烧技术中的一个长期已知的问题。声学和湍流旋流火焰之间的复杂相互作用尚未完全理解，使得很难可靠地预测新的燃烧系统的稳定性。例如，必须更详细地研究漩涡数波动对火焰放热的影响。本文研究了一种可调旋流器轴向位置的全预混旋流稳定燃烧器。在实验中，旋流发生器的位置有很大的影响，动态火焰响应，虽然它并不影响的时间平均分布的热释放显着。这种现象进一步研究，使用计算流体动力学结合系统识别。涡流数的波动，其传播到火焰的产生，以及它们对动态火焰响应的影响进行了研究。建立了一个基于对流时滞的简单模型，与实验结果吻合良好。
Combustion instabilities represent a long known problem in combustion technology. The complex interactions between acoustics and turbulent swirling flames are not fully understood yet, making it very difficult to reliably predict the stability of new combustion systems. For example, the effects of fluctuations of swirl number on the heat release of the flame have to be investigated in more detail. In this paper a perfectly premixed, swirl stabilized burner with variable axial position of the swirl generator is investigated. In experiments, the position of the swirl generator has a strong impact on the dynamic flame response, although it does not influence the time-averaged distribution of the heat release significantly. This phenomenon is further investigated, using computational fluid dynamics combined with system identification. The generation of fluctuations of swirl number, their propagation to the flame, and their effect on the dynamic flame response are examined. A simple model based on convective time lags is developed, showing good agreement with experiments.Copyright © 2009 by ASME