Thermoacoustic Limit Cycle Predictions of a Pressurised Longitudinal Industrial Gas Turbine Combustor
Thermoacoustic Limit Cycle Predictions of a Pressurised Longitudinal Industrial Gas Turbine Combustor
复制标题
加压纵向工业燃气轮机燃烧室的热声极限循环预测
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
J. Rogerson
中科院分区：
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作者：
Yu Xia;D. Laera;A. Morgans;W. Jones;J. Rogerson
本文介绍了工业燃气涡轮机燃烧室热声极限环的数值预测。该案例对应于配备有全尺寸西门子SGT-100燃烧器的实验高压试验台，该燃烧器在3巴和6巴的两个平均压力水平下运行。火焰传递函数（FTF）表征的全球非定常响应的火焰速度扰动得到的不可压缩大涡模拟（LES）的装置的操作压力。线性稳定性分析，然后进行耦合的FTFs与基于波的低阶热声网络求解器。所有的热声模式预测在3巴的压力是稳定的，而在6巴的模式被发现是不稳定的频率为231赫兹，这与实验一致。将大涡模拟预测的火焰描述函数（FDF）与低阶热声网络求解器相结合，进行了弱非线性稳定性分析。利用与209 Hz极限环相对应的频率、振型和速度幅值计算了燃烧室内的绝对压力脉动幅值。发现数值重建的振幅与测量的动态相当接近。
This article presents numerical prediction of a thermoacoustic limit cycle in an industrial gas turbine combustor. The case corresponds to an experimental high pressure test rig equipped with the full-scale Siemens SGT-100 combustor operated at two mean pressure levels of 3 bar and 6 bar. The Flame Transfer Function (FTF) characterising the global unsteady response of the flame to velocity perturbations is obtained for both operating pressures by means of incompressible Large Eddy Simulations (LES). A linear stability analysis is then performed by coupling the FTFs with a wave-based low order thermoacoustic network solver. All the thermoacoustic modes predicted at 3 bar pressure are stable; whereas one of the modes at 6 bar is found to be unstable at a frequency of 231 Hz, which agrees with the experiments. A weakly nonlinear stability analysis is carried out by combining the Flame Describing Function (FDF) predicted by LES with the low order thermoacoustic network solver. The frequency, mode shape and velocity amplitude corresponding to the predicted limit cycle at 209 Hz are used to compute the absolute pressure fluctuation amplitude in the combustor. The numerically reconstructed amplitude is found to be reasonably close to the measured dynamics.