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- W4309077993 abstract "We experimentally study the effect of rotational asymmetries in the flame response distribution on the thermoacoustic oscillations of four turbulent lean-premixed combustors coupled in a ring network. The asymmetries are created via different combinations of high-swirl (HS) and low-swirl (LS) nozzles. By analyzing the inter-combustor acoustic interactions in terms of discrete thermoacoustic modes, we find a variety of modal patterns: (i) global alternating push–pull modes emerge for most pair-wise asymmetric nozzle combinations, (ii) 2-can push–pull modes emerge for an alternating 2-fold symmetric nozzle combination, and (iii) strong mode localization and global push–push modes emerge when the HS nozzles outnumber the LS nozzles. Using a complex systems framework, we reinterpret these modal patterns as collective states, such as a weak breathing chimera, a weak anti-phase chimera, and in-phase/anti-phase synchronization. This study shows that changing the flame response distribution of a multi-combustor system, via changes in the nozzle swirl distribution, can induce a variety of modal patterns and collective states. This sets the stage for the potential use of rotational asymmetries in the passive control of thermoacoustic modes in can-annular combustion systems." @default.
- W4309077993 created "2022-11-21" @default.
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- W4309077993 date "2023-01-01" @default.
- W4309077993 modified "2023-10-14" @default.
- W4309077993 title "Effect of flame response asymmetries on the modal patterns and collective states of a can-annular lean-premixed combustion system" @default.
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- W4309077993 doi "https://doi.org/10.1016/j.proci.2022.08.095" @default.
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