Modelling of instabilities in turbulent swirling flames

Dinesh, K.K.J. Ranga; Jenkins, Karl W.; Kirkpatrick, M.P.; Malalasekera, Weeratunge

doi:10.1016/j.fuel.2009.06.024

Cited by 22 publications

(4 citation statements)

References 33 publications

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“…One is the conventional cubic or cylindrical domain (Kempf et al, 2008;Malalasekera et al, 2008Malalasekera et al, , 2007Ranga Dinesh and Kirkpatrick, 2009). The other domain is the conventional geometry with the inflow plane shifted upstream (Kempf et al, 2008;Ranga Dinesh et al, 2010;. Some groups have used the latter approach because of simulation experience with the corresponding bluff-body reacting case (Kempf et al, 2006).…”

Section: Grid System and Boundary Conditionsmentioning

confidence: 99%

Large-eddy simulations of the non-reactive flow in the Sydney swirl burner

Yang

Kær

2012

International Journal of Heat and Fluid Flow

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Section: Grid System and Boundary Conditionsmentioning

confidence: 99%

Large-eddy simulations of the non-reactive flow in the Sydney swirl burner

Yang

Kær

2012

International Journal of Heat and Fluid Flow

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“…In the present work, we focus on the Sydney swirl burner. − This burner has been investigated by many researchers to verify the turbulent model and combustion model, and study the flame characteristics. − Yang et al reported two types of large eddy simulation (LES) and Reynolds-averaged Navier–Stokes (RANS) models simulation results of SMH1 flames. They found that the Cvar number was a vital factor in affecting the local extinction phenomenon for the laminar flamelet model.…”

Section: Introductionmentioning

confidence: 99%

“…Kashir et al and Rohani et al showed the characteristics of the H 2 addition and different swirl numbers of SM1 flame by numerical methods. The instabilities of SM1 and SM2 flames were investigated by Ranga Dinesh et al…”

Section: Introductionmentioning

confidence: 99%

“…Kashir et al 26 and Rohani et al 27 showed the characteristics of the H 2 addition and different swirl numbers of SM1 flame by numerical methods. The instabilities of SM1 and SM2 flames were investigated by Ranga Dinesh et al 28 In this paper, the coaxial air microjet is added to the SM1 flame based on the Sydney burner. To analyze the combustion characteristics of microjet-assisted SM1 flame, the numerical models must be validated first.…”

Section: Introductionmentioning

confidence: 99%

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Combustion Characteristics of Bluff-Body Turbulent Swirling Flames with Coaxial Air Microjet

et al. 2017

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The interaction between the coaxial air microjet structure and the swirling flow is investigated numerically based on the nonpremixed bluff-body stabilized swirling SM1 flame. The effects of microjet velocity and swirl number on flame combustion characteristics are analyzed. The modified standard k–ε model and the realizable k–ε model are considered for the turbulent model using FLUENT software. The flamelet model is used with the GRI 2.11 detailed kinetic mechanism. In addition, the discrete ordinate model and the weighted-sum-of-gray-gases model are used together to deal with the radiative heat transfer in the combustion process. Results of the modified standard k–ε model are in better agreement with the experimental data than the realizable k–ε model. Results show that the inner flame generates due to the existence of a microjet configuration. High microjet velocity (such as 50 m/s) can reduce the soot formation and keep the inner flame high temperature region away from the microjet nozzle. The structure of the inner flame depends on the microjet velocity and is independent of the swirl number. Swirl number increases from 0.3 to 0.6, the primary peak temperature is enhanced by 48 K, and the peak soot volume fraction is increased by 49% along the axis centerline.

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