Combustion Instability Analysis of a Model Gas Turbine by Application of Dynamic Mode Decomposition

IF 0.7 Q4 ENGINEERING, MECHANICAL Journal of the Korean Society of Combustion Pub Date : 2019-03-31 DOI:10.15231/JKSC.2019.24.1.051
왕위엔강, J. Son, C. Sohn, Yoon Jisu, 배진현, Y. Yoon
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引用次数: 3

Abstract

Dynamic mode decomposition (DMD) technique is applied to analyze combustion instabilities in a model gas turbine combustor. The flame transfer function (FTF) obtained by the DMD method agrees with the experimental results qualitatively. However, FTF results show that the perturbation frequency with the largest gain is 100Hz, which contradicts the 1000Hz with the largest amplitude in the fast Fourier transform (FFT) results. In order to figure out this, gains and damping coefficients of all resonance frequencies are calculated by DMD technique. Results show the possibility that the model combustor has high-frequency instabilities as a results of coupling between flame and chamber responses. Another finding is that to obtain a pure FTF, the combustor must be removed to exclude coupling of chamber response with flame response.
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应用动态模态分解分析某型燃气轮机燃烧不稳定性
采用动态模态分解(DMD)技术对模型燃气轮机燃烧室的燃烧不稳定性进行了分析。用DMD方法得到的火焰传递函数(FTF)与实验结果定性吻合。然而,FTF结果表明,增益最大的扰动频率为100Hz,这与快速傅里叶变换(FFT)结果中最大振幅为1000Hz的结果相矛盾。为此,利用DMD技术计算了各谐振频率的增益和阻尼系数。结果表明,由于火焰和燃烧室响应之间的耦合,模型燃烧室可能存在高频不稳定性。另一个发现是,为了获得纯粹的FTF,必须移除燃烧室以排除燃烧室响应与火焰响应的耦合。
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50.00%
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