Large eddy simulation of forced ignition of an annular bluff-body burner

Subramanian, Venkatesh; Domingo, Pascale; Vervisch, Luc

doi:10.1016/j.combustflame.2009.09.014

Cited by 73 publications

(41 citation statements)

References 72 publications

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“…They also suggest that to be able to capture ignition transients properly with LES, the combustion model must include local quenching. This seems to be included in some efforts [6][7][8], but further validation is necessary and the present data can be used for that purpose.…”

Section: Ignition Probabilitymentioning

confidence: 99%

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Simulations and experiments on the ignition probability in turbulent premixed bluff-body flames

Sitte

Bach

Kariuki

et al. 2016

Combustion Theory and Modelling

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The ignition characteristics of a premixed bluff-body burner under lean conditions were investigated experimentally and numerically with a physical model focusing on ignition probability. Visualisation of the flame with a 5 kHz OH* chemiluminescence camera confirmed that successful ignitions were those associated with the movement of the kernel upstream, consistent with previous work on non-premixed systems. Performing many separate ignition trials at the same spark position and flow conditions resulted in a quantification of the ignition probability P ign , which was found to decrease with increasing distance downstream of the bluff body and a decrease in equivalence ratio. Flows corresponding to flames close to the blow-off limit could not be ignited, although such flames were stable if reached from a richer already ignited condition. A detailed comparison with the local Karlovitz number and the mean velocity showed that regions of high P ign are associated with low Ka and negative bulk velocity (i.e. towards the bluff body), although a direct correlation was not possible. A modelling effort that takes convection and localised flame quenching into account by tracking stochastic virtual flame particles, previously validated for non-premixed and spray ignition, was used to estimate the ignition probability. The applicability of this approach to premixed flows was first evaluated by investigating the model's flame propagation mechanism in a uniform turbulence field, which showed that the model reproduces the bending behaviour of the S T -versus-u curve. Then ignition simulations of the bluff-body burner were carried out. The ignition probability map was computed and it was found that the model reproduces all main trends found in the experimental study.

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Section: Ignition Probabilitymentioning

confidence: 99%

“…Large eddy simulations (LESs) have been shown to be a powerful tool for the simulation of spark ignition events [4][5][6][7][8][9][10][11]. However, due to the probabilistic nature of turbulent flows, repetitive simulations are required to assess the ignition characteristics including the ignition probability P ign numerically [1].…”

Section: Introductionmentioning

confidence: 99%

Simulations and experiments on the ignition probability in turbulent premixed bluff-body flames

Sitte

Bach

Kariuki

et al. 2016

Combustion Theory and Modelling

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“…18. Failed ignition sequence as observed in time by LES [310] of the experimentally diagnosed configuration of [314] shown on Fig. 17.…”

Section: Leadership-class Les Modeling and Predictionsmentioning

confidence: 99%

“…An example of forced ignition studied experimentally by [314], Fig. 17, and computed with LES by [310] one observes two distinct transient predictions: a failed one, Fig. 18, and a successful ignition, Fig.…”

Section: Transient Operating Conditionsmentioning

confidence: 99%

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Gicquel

Staffelbach

Poinsot

2012

Progress in Energy and Combustion Science

391

183

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“…Spark ignition has also been studied experimentally for non-premixed flames in various geometries (Ahmed et al, 2007a(Ahmed et al, , 2007bAhmed and Mastorakos, 2006 and through Large Eddy Simulation (LES) (Bulat et al, 2013;Jones and Prasad, 2011;Jones et al, 2012;Lacaze et al, 2009;Subramanian et al, 2010;Triantafyllidis et al, 2009). Moreover, low-order ignition models providing lower computational cost have been developed in order to provide easier prediction of the ignition behavior in non-premixed and spray single burners (Eyssartier et al, 2013;Neophytou et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Stochastic Behavior of Light-Round in Annular Non-Premixed Combustors

Machover

Mastorakos

2017

Combustion Science and Technology

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The ignition behavior of a non-premixed multiple-burner annular combustion chamber was investigated numerically, focusing on the stochasticity and average speed of the light-round mechanism ensuring flame propagation from burner to burner that have been observed experimentally. During the propagation sequence, the flame expansion process is tracked by a previously developed stochastic low-order ignition model adapted to full combustor ignition. A stochastic model based on the probability that a flame fragment coming from an ignited burner leads to successful ignition of the next un-ignited one is developed in order to explain and quantify the global ignition behavior of the combustor. The stochastic behavior of the rig, highlighted through the experimentally observed variability of the burner-to-burner propagation times during the ignition sequence, was clarified and quantified. The lean light-round ignition limiting conditions and the mean light-round speed measured experimentally are explained and reasonably accurately predicted, demonstrating the validity of the use of the probabilistic model together with the low-order ignition model for the combustor considered. The results presented in this paper can be used to predict the ignition envelope of annular gas turbines combustors at the design stage.ARTICLE HISTORY

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Large eddy simulation of forced ignition of an annular bluff-body burner

Cited by 73 publications

References 72 publications

Simulations and experiments on the ignition probability in turbulent premixed bluff-body flames

Simulations and experiments on the ignition probability in turbulent premixed bluff-body flames

Large Eddy Simulations of gaseous flames in gas turbine combustion chambers

Numerical Investigation of the Stochastic Behavior of Light-Round in Annular Non-Premixed Combustors

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