Advances by the Marie Curie project TANGO in                     thermoacoustics

Heckl, M.

doi:10.1177/1756827719830950

Cited by 3 publications

(4 citation statements)

References 55 publications

(188 reference statements)

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“…The analysis, prediction and control of thermoacoustic oscillations have been the subject of extensive research (Candel 2002; Dowling & Morgans 2005; Lieuwen & Yang 2005; Culick 2006; Sujith, Juniper & Schmid 2016; Poinsot 2017; Juniper & Sujith 2018; Heckl 2019; Polifke 2020; Schuller, Poinsot & Candel 2020). Most of the existing literature has focused on single combustors because these have simple geometries and well-defined boundary conditions while still being governed by the same physical mechanisms that are responsible for the thermoacoustic feedback loops described above.…”

Section: Introductionmentioning

confidence: 99%

“…Although considerable research exists on intra-combustor flame–acoustic interactions (Candel 2002; Dowling & Morgans 2005; Lieuwen & Yang 2005; Culick 2006; Sujith et al. 2016; Poinsot 2017; Juniper & Sujith 2018; Heckl 2019; Polifke 2020; Schuller et al. 2020), less is known about inter-combustor acoustic–acoustic interactions.…”

Section: Introductionmentioning

confidence: 99%

“…inter-combustor interactions) (Mongia et al 2003;Kaufmann et al 2008;Luque et al 2015;Farisco, Panek & Kok 2017;Bonciolini & Noiray 2019;Ghirardo et al 2019;von Saldern, Moeck & Orchini 2021a). Although considerable research exists on intra-combustor flame-acoustic interactions (Candel 2002;Dowling & Morgans 2005;Lieuwen & Yang 2005;Culick 2006;Sujith et al 2016;Poinsot 2017;Juniper & Sujith 2018;Heckl 2019;Polifke 2020;Schuller et al 2020), less is known about inter-combustor acoustic-acoustic interactions. In this experimental study, we take a complex systems approach to investigating both types of interactions, with a focus on how they give rise to collective dynamics in a self-excited thermoacoustic system consisting of four turbulent lean-premixed combustors coupled in a ring configuration.…”

Section: Introductionmentioning

confidence: 99%

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Synchronization and chimeras in a network of four ring-coupled thermoacoustic oscillators

et al. 2022

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We take a complex systems approach to investigating experimentally the collective dynamics of a network of four self-excited thermoacoustic oscillators coupled in a ring. Using synchronization metrics, we find a wide variety of emergent multi-scale behaviour, such as (i) a transition from intermittent frequency locking on a $\mathbb {T}^{3}$ quasiperiodic attractor to a breathing chimera, (ii) a two-cluster state of anti-phase synchronization on a periodic limit cycle, and (iii) a weak anti-phase chimera. We then compute the cross-transitivity from recurrence networks to identify the dominant direction of the coupling between the heat-release-rate ( $q^{\prime }_{\mathbb {X}}$ ) and pressure ( $p^{\prime }_{\mathbb {X}}$ ) fluctuations in each individual oscillator, as well as that between the pressure ( $p^{\prime }_{\mathbb {X}}$ and $p^{\prime }_{\mathbb {Y}}$ ) fluctuations in each pair of coupled oscillators. We find that networks of non-identical oscillators exhibit circumferentially biased $p^{\prime }_{\mathbb {X}}$ – $p^{\prime }_{\mathbb {Y}}$ coupling, leading to mode localization, whereas networks of identical oscillators exhibit globally symmetric $p^{\prime }_{\mathbb {X}}$ – $p^{\prime }_{\mathbb {Y}}$ coupling. In both types of networks, we find that the $p^{\prime }_{\mathbb {X}}$ – $q^{\prime }_{\mathbb {X}}$ coupling can be symmetric or asymmetric, but that the asymmetry is always such that $q^{\prime }_{\mathbb {X}}$ exerts a greater influence on $p^{\prime }_{\mathbb {X}}$ than vice versa. Finally, we show through a cluster analysis that the $p^{\prime }_{\mathbb {X}}$ – $p^{\prime }_{\mathbb {Y}}$ interactions play a more critical role than the $p^{\prime }_{\mathbb {X}}$ – $q^{\prime }_{\mathbb {X}}$ interactions in defining the collective dynamics of the system. As well as providing new insight into the interplay between the $p^\prime_{\mathbb{X}}\text{--}p^\prime_{\mathbb{Y}}$ and $p^\prime_{\mathbb{X}}\text{--}q^\prime_{\mathbb{X}}$ coupling, this study shows that even a small network of four ring-coupled thermoacoustic oscillators can exhibit a wide variety of collective dynamics. In particular, we present the first evidence of chimera states in a minimal network of coupled thermoacoustic oscillators, paving the way for the application of oscillation quenching strategies based on chimera control.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synchronization and chimeras in a network of four ring-coupled thermoacoustic oscillators

et al. 2022

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“…The second effect -the acoustic scattering at the tube row -is primarily due to the geometry and flow, and can be studied initially for a cold flow with no heat transfer present. In the absence of a mean flow, the acoustic waves are scattered by the tube rows in which viscous effects and thereby attenuation or damping is normally small at the low frequencies relevant to thermoacoustics [6,7]. On the other hand, in the presence of a mean flow, flow separation and vortex shedding can significantly enhance sound attenuation [8].…”

Section: Introductionmentioning

confidence: 99%

A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow

Surendran,

Na,

Boakes

et al. 2022

Preprint

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Heat exchanger tube rows can influence the thermoacoustic instability behaviour of combustion systems since they act as both acoustic scatterers and unsteady heat sinks. Therefore, with careful tuning of their thermoacoustic properties, heat exchangers have the potential to act as passive control devices. In this work, we focus on (only) the acoustic scattering behaviour of heat exchanger tubes. We present a comparison of existing acoustic models for tube rows and slits, models for the latter having the advantage of incorporating frequency dependence. We then propose a new model that enables the adaptation of slit models for tube rows. This model is validated against experiments and Linearised Navier Stokes Equations (LNSE) predictions for the transmission and reflection coefficients, including phase information. The model predictions show very good agreement with the experimental and numerical validations, especially for low frequencies (Strouhal number < 0.5, based on tube radius and excitation frequency), with mean differences less than 2% for the transmission coefficients (the reflection coefficient errors are somewhat larger since their magnitudes are very close to zero).

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A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow

Surendran

Wei

Boakes

et al. 2022

Journal of Sound and Vibration

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Advances by the Marie Curie project TANGO in thermoacoustics

Cited by 3 publications

References 55 publications

Synchronization and chimeras in a network of four ring-coupled thermoacoustic oscillators

Synchronization and chimeras in a network of four ring-coupled thermoacoustic oscillators

A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow

A low frequency model for the aeroacoustic scattering of cylindrical tube rows in cross-flow

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