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Investigation of the Effect of Surface Roughness on the Pulsating Flow in Combustion Chambers with LES

机译：LES燃烧室表面粗糙度对脉动流动影响的研究

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Self-excited oscillations often occur in combustion systems due to the combustioninstabilities. The high pressure oscillations can lead to higher emissions and structural damageof the chamber. In the last years intensive experimental investigations were performed at theUniversity of Karlsruhe to develop an analytical model for the Helmholtz resonator-type com-bustion systems [1]. In order to better understand the flow effects in the chamber and to localizethe dissipation, Large Eddy Simulations (LES) were carried out. Magagnato et al. [2] describethe investigation of a simplified combustion system where the LES were carried out exclusivelywith a hydraulic smooth wall. The comparison of the results with experimental data shows theimportant influence of the surface roughness in the resonator neck on the resonant characteris-tics of the system. In order to catch this effect with CFD as well, the modeling of surfaceroughness is needed. In this paper the Discrete Element Method has been implemented into ourresearch code and extended for LES. The simulation of the combustion chamber with rough-ness agrees well with the experimental results.
机译：由于燃烧系统，燃烧系统通常发生自激振荡。高压振荡可导致腔室的排放较高和结构受损。在过去几年中，在Karlsruhe的Ituniversity中进行了密集的实验调查，为Helmholtz谐振器型Com-Resoust系统进行了分析模型[1]。为了更好地了解腔室中的流动效果和局部化耗散，进行大型涡流模拟（LES）。 magagnato等人。 [2]描述对简化燃烧系统的研究，其中LES由液压光滑壁进行。实验数据结果的比较显示了谐振器颈部表面粗糙度对系统的共振特征性的影响。为了用CFD捕获这种效果，需要对表面的建模。在本文中，离散元素方法已实现为OurSearch代码并为LES扩展。用粗糙度的燃烧室模拟与实验结果很好。

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