The effect of hydrogen enrichment, flame-flame interaction, confinement, and asymmetry on the acoustic response of a model can combustor

To maximise power density practical gas turbine combustion systems have several injectors which can lead to complex interactions between flames. However, our knowledge about the effect of flame-flame on flame response, essential element predict stability a combustor, is still limited. The present study investigates hydrogen enrichment, interaction, confinement, and asymmetries linear non-linear acoustic response three premixed flames in simple combustor. A parametric characterised by transfer function (FTF), performed for swirling non-swirling Flame-flame were achieved changing injector spacing level enrichment from 10 50%. It was found that latter had most significant response. Asymmetry effects investigated one using different bluff-body alter both shape flow field. global showed asymmetric cases be reconstructed superposition two symmetric where all bluff-bodies are same. Overall, (FTF) increasing more pronounced than spacing. Increasing results compact minimises interactions. More increase cut-off frequency self-excited modes at higher frequencies. Finally, measuring describing (FDF) close mode combustor spacings levels enrichment. shown leads saturation amplitude whereas has comparably smaller effect.