Scattering and Generation of Acoustic Energy by a Premix Swirl Burner
Scattering and Generation of Acoustic Energy by a Premix Swirl Burner
复制标题
预混旋流燃烧器声能的散射和产生
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
W. Polifke
中科院分区：
文献类型：
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作者：
Alexander M. G. Gentemann;W. Polifke
详细研究了预混旋流燃烧器对声能的散射和产生。分析是根据燃烧器的散射矩阵进行的，由计算流体力学和系统辨识相结合，并辅之以简单的火焰频率响应分析模型和燃烧器传递矩阵。值得注意的是，在较窄的频率范围内，入射声波被非稳态热释放强烈放大，即产生声能。虽然计算和实验数据是针对一种特定的旋流燃烧器设计获得的，但进一步的分析表明，这种行为在许多燃烧器设计中应该是常见的。讨论了热声稳定性的后果以及燃烧器和燃烧器的设计策略。版权所有©2007，ASME
The scattering and generation of acoustic energy by a premix swirl burner is scrutinized. The analysis is formulated in terms of the scattering matrix of the burner, determined by a combination of computational fluid dynamics and system identification as well as experiment supplemented with simple analytical models for flame frequency response and burner transfer matrix. Remarkably, it is found that in a narrow range of frequencies, incoming acoustic waves are amplified strongly by the unsteady heat release, i.e. acoustic energy is generated. Although the computational and experimental data were obtained for one specific swirl burner design, further analysis suggests that such behavior should be common for many burner designs. Consequences for thermo-acoustic stability as well as burner and combustor design strategies are discussed.Copyright © 2007 by ASME