Large Eddy Simulation of a Bluff Body Stabilised Premixed Flame Using Flamelets

Massey, James C.; Langella, Ivan; Swaminathan, Nedunchezhian

doi:10.1007/s10494-018-9948-9

Cited by 16 publications

(6 citation statements)

References 41 publications

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“…It is also worth mentioning that SGS variance transport has been adopted in several LES simulations Langella et al , 2018Massey et al 2018;Chen et al 2019a;b, 2020;Massey et al 2019) in the past for atmospheric flames, and these simulations successfully used several model expressions considered in this analysis (e.g. Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…This SDR based reaction rate closure was also previously successfully implemented in LES albeit for atmospheric premixed turbulent combustion (Ma et al 2014a;Butz et al 2015) and the SDR closure given by Eqs. 16i and 16ii has been used in several previous LES studies (Ma et al 2014a;Butz et al 2015;Langella et al 2018;Massey et al 2018;Chen et al 2019aChen et al , b, 2020Massey et al 2019) for atmospheric premixed combustion. The current analysis justifies the choices of the model expressions given by Eqs.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the Closures of Sub-grid Scale Variance of Reaction Progress Variable for Turbulent Bunsen Burner Flames at Different Pressure Levels

Keil

Chakraborty

Klein

2020

Flow Turbulence Combust

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The statistical behaviour and modelling of the sub-grid variance of reaction progress variable have been analysed based on a priori analysis of direct numerical simulation (DNS) data of turbulent premixed Bunsen burner flames at different pressure levels. An algebraic expression for sub-grid variance, which can be derived based on a presumed bi-modal subgrid distribution of reaction progress variable with impulses at unburned reactants and fully burned products, has been found to be inadequate for the purpose of prediction of sub-grid variance even for the flames in the wrinkled flamelets/corrugated flamelets regime. Moreover, an algebraic model, which is often used for modelling sub-grid variance of passive scalars, has been found to significantly overpredict the sub-grid variance of reaction progress variable for all the cases considered here. The modelling of the unclosed terms of the sub-grid variance transport equation has been analysed in detail. Suitable model expressions have been identified for the sub-grid flux of variance, reaction rate contribution and scalar dissipation rate based on a priori analysis of DNS data. It has been found that the alternation of pressure does not have any significant impact on the closures of sub-grid flux of variance but a model parameter for the Favre-filtered scalar dissipation rate needs to be modified to account for the variation of pressure.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Analysis of the Closures of Sub-grid Scale Variance of Reaction Progress Variable for Turbulent Bunsen Burner Flames at Different Pressure Levels

Keil

Chakraborty

Klein

2020

Flow Turbulence Combust

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“…The SGS parameters Da Δ , C 3 , C 4 , and K c are described in detail by Dunstan et al (2013). This model has been successfully used in many previous studies (Chen et al, 2017(Chen et al, , 2019Langella et al, 2018Langella et al, , 2016Massey et al, 2018). The laminar flame speed s 0 L , thermal thickness δ 0 L and the heat release parameter τ, shown in Equation 8, depend on the local mixture fraction (Ruan et al, 2014).…”

Section: Governing Equationsmentioning

confidence: 99%

Lean Flame Root Dynamics in a Gas Turbine Model Combustor

Massey

Chen

Swaminathan

2019

Combustion Science and Technology

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A swirl-stabilised flame close to blow-off conditions in a gas turbine model combustor is investigated using large eddy simulation. The subgrid combustion is modelled using a presumed probability density function approach along with flamelets. Good comparisons between the computed and measured statistics are observed. This allows for a detailed investigation of the flame behaviour. Two distinct stages are noted for the flame behaviour. The flame has a steady and stable flame root anchored near the entrance to the burner, yielding a "V" shaped flame in Stage 1, and a transient lift-off event is observed in Stage 2. These two stages switch from one to the other, giving the unstable flame behaviour, as observed in the experimental studies. Further analysis of the simulations shows that large-scale scalar mixing plays a prominent role in the stabilisation of the flame and the entrainment of inflammable mixtures near the flame root location initiates the lift-off event.

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“…The present data on flame location as a function of operating condition and approach to global blow-off, on FSD, and the width of CH 2 O regions can be useful for modelling studies. Typical efforts for turbulent premixed flames include pre-tabulated approaches [11,63,64] and on-line solution of the chemical structures [65][66][67][68]. Both approaches could benefit from the present experimental data.…”

Section: Discussionmentioning

confidence: 99%