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首页> 外文期刊>Journal of aerospace engineering >Dynamic Mode Decomposition of Turbulent Combustion Process in DLR Scramjet Combustor
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Dynamic Mode Decomposition of Turbulent Combustion Process in DLR Scramjet Combustor

机译：DLR超燃喷射燃烧器湍流燃烧过程的动态模式分解

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Large eddy simulations (LES) are employed to investigate instabilities in the combustion process of a model scramjet combustor at the German Aerospace Center (DLR). Dynamic mode decomposition (DMD) is applied to analyze the numerical results. The DMD spectrum of the hydroxyl (OH) field is analyzed, and primary peaks are observed at 6375, 9763, 12063, and 15745 Hz, corresponding to S-t = 0.0524, 0.0802, 0.099, and 0.129, respectively. The DMD mode corresponding to S-t = 0.099 exhibits antisymmetric patterns in the wake of the strut, with the DMD mode corresponding to S-t = 0.129 displaying similar structures. The DMD spectrum of the hydroperoxyl (HO2) field is also investigated. Antisymmetric patterns initiating from both trailing edges of the strut are also extracted at nearly the same Strouhal numbers. DMD analyses are also performed on the pressure and velocity fields. The dominant frequencies in the pressure field are lower than those of the OH and HO2 fields, indicating that the dominant pressure oscillation is unlikely to couple with the strongest unsteadiness in the OH and HO2 fields. The streamwise component of the velocity DMD mode attributed to the same Strouhal number exhibits an antisymmetric pattern similar to the most unstable OH DMD modes. Wake instability is believed to be the main cause of the dominant oscillations in the OH field. Moreover, the unsteady characteristics of the HO2 field are also related to the wake instability. (C) 2017 American Society of Civil Engineers.
机译：大涡流模拟（LES）用于研究德国航空航天中心（DLR）的超燃冲压发动机燃烧室燃烧过程中的不稳定性。使用动态模式分解（DMD）来分析数值结果。分析了羟基（OH）场的DMD光谱，并在6375、9763、12063和15745 Hz处观察到一个主要峰，分别对应于S-t = 0.0524、0.0802、0.099和0.129。对应于S-t = 0.099的DMD模式在支撑杆尾部表现出反对称模式，而对应于S-t = 0.129的DMD模式显示相似的结构。还研究了氢过氧基（HO2）场的DMD光谱。从支柱的两个后缘开始的反对称图案也以几乎相同的Strouhal数提取。还对压力和速度场进行DMD分析。压力场中的主导频率低于OH和HO2场，这表明主导压力振荡不太可能与OH和HO2场中最强的不稳定联系在一起。归因于相同的Strouhal数的速度DMD模式的流向分量显示出与最不稳定的OH DMD模式相似的反对称模式。尾波不稳定性被认为是OH场中主要振荡的主要原因。此外，HO2场的不稳定特性也与尾流不稳定性有关。 （C）2017年美国土木工程师学会。

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