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Influence of fuel plenum on thermoacoustic oscillations inside a swirl combustor

机译：燃料压力对旋流燃烧器内热声振荡的影响

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摘要

Large eddy simulation (LES) of a lean methane/air flame exhibiting self-excited thermoacoustic oscillations inside a swirl combustor is performed. The influence of fuel plenum on the combustor dynamics is studied. The velocity, temperature and mixture fraction statistics computed from the two LES cases are compared with the measurements. The results show good overall agreement for both cases with slight improvements by including the fuel plenum. In particular, the near-field mixing and flame lift-off height are captured more accurately. The dominant unstable Helmholtz frequency (approximate to 270 Hz) computed by including the plenum is closer to the measured value (approximate to 290 Hz) compared to that (approximate to 250 Hz) obtained without the plenum. Mode shape analysis shows that including the fuel plenum is necessary for obtaining the phase difference between the pressure oscillations in the combustion chamber and air plenum. It is also found that self-excited oscillations are amplified with an increase by 6% in the mean Rayleigh index and 50% in the gain of the flame transfer function due to the equivalence ratio fluctuations when the fuel plenum is included.
机译：进行贫甲烷/空气火焰的大型涡流模拟（LES），在旋流燃烧器内部表现出自激热声振荡。研究了燃料增压对燃烧器动力学的影响。将两种LES案例计算的速度，温度和混合物统计分数与测量进行比较。结果表明，通过包括燃料增压室，两种情况都表现出良好的改进。特别地，近场混合和火焰升降高度更准确地捕获。与包含不含增压室获得的（近似为250Hz）相比，通过包括增压室计算的主要不稳定的Helmholtz频率（近似到270Hz）更接近测量值（近似为290Hz）。模式形状分析表明，包括燃料增压室，用于获得燃烧室和空气增压室中的压力振荡之间的相位差。还发现，由于当包括燃料增压件时，平均瑞利指数在平均瑞利指数中增加了自激振荡，其平均瑞利指数中的平均瑞利指数增加了6％，并且由于当燃料增压室内的等效比波动而导致的火焰传递函数的增益。

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