Measurements of no in turbulent non-premixed flames stabilized on a bluff body

Dally, B.; Masri, Assaad R.; Fiechtner, Gregory J.; Fletcher, David F.

doi:10.1016/s0082-0784(96)80045-2

Cited by 32 publications

(23 citation statements)

References 10 publications

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“…The Sydney bluff-body burner have been investigated and/or used for validation purposes in several recent studies (e.g., Dally et al [59][60][61][62][63][64] and Turpin and Troyes 65 ). The geometry of the bluff-body burner is shown in Figure 10.…”

Section: Numerical Results For Bluff-body Burnermentioning

confidence: 99%

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Gaoand

Groth

2008

46th AIAA Aerospace Sciences Meeting and Exhibit

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A parallel adaptive mesh refinement (AMR) algorithm is described for predicting turbulent non-premixed gaseous combusting flows in three space dimensions. The Favreaveraged Navier-Stokes equations governing a reactive mixture of thermally perfect gases, the two transport equations of the k-ω turbulence model, and the time-averaged species transport equations, are all solved using a fully coupled finite-volume formulation on bodyfitted multi-block hexahedral mesh. The numerical algorithm adopts a cell-centred upwind finite-volume discretization procedure and uses limited solution reconstruction, approximate Riemann solver based flux functions to determine the inviscid (hyperbolic) flux at cell interfaces. The viscous (elliptic) components of the cell face flux are evaluated by employing a hybrid average gradient-diamond path approach. For the treatment of near-wall turbulence, both low-Reynolds-number and wall-function formulations of the k-ω model are used, with a procedure for automatically switching from one to the other, depending on mesh resolution. A flexible block-based hierarchical octree data structure is used to maintain the connectivity of the solution blocks in the multi-block mesh and facilitate automatic solution-directed mesh adaptation according to physics-based refinement criteria. This AMR approach allows for anisotropic mesh refinement and the block-based data structure readily permits efficient and scalable implementations of the algorithm on multi-processor architectures. Numerical results for turbulent non-premixed methane-air diffusion flames are described to demonstrate the validity and potential of the parallel AMR approach for predicting complex combusting flows.

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Section: Numerical Results For Bluff-body Burnermentioning

confidence: 99%

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Gaoand

Groth

2008

46th AIAA Aerospace Sciences Meeting and Exhibit

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“…The HM2 bluff body stabilised diffusion flame investigated experimentally by Masri and co-workers [9][10][11][12]14] has a fuel jet velocity corresponding to around 75% of the blow-off velocity and the effects of local extinction are more prominent when compared to flame HM1. The outer diameter of the bluff body is D B = 50 mm and the central fuel jet has a diameter D jet = 3.6 mm.…”

Section: Case Configurationmentioning

confidence: 99%

“…Comprehensive experimental investigations of several bluff-body stabilised flames have been performed by Masri and co-workers [9][10][11][12]. In the current work, one of the H 2 /CH 4 (1:1) axisymmetric bluff body stabilised flames is studied computationally using the hybrid finite volume/transported PDF approach of Kuan and Lindstedt [8].…”

Section: Introductionmentioning

confidence: 99%

Transported PDF Modelling of a High Velocity Bluff-Body Stabilised Flame (HM2) Using Detailed Chemistry

Gkagkas

Lindstedt

Kuan

2008

Flow Turbulence Combust

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A transported probability density function (PDF) approach closed at the joint scalar level was used to model a bluff body stabilised turbulent diffusion flame (HM2) investigated experimentally by Masri and co-workers. The current effort extends a previous study of HM1 (Re = 15,800) to a flame with a higher degree of local extinction (Re = 23,900). The impact of an algebraic model that accounts for local Damköhler number effects on the time-scale ratio of scalar to mechanical turbulence is also evaluated along with the impact of improved thermochemistry. The computations have been performed using a hybrid Monte Carlo/finite volume algorithm and a systematically reduced H/C/N/O mechanism featuring 300 reactions, 20 solved and 28 steady-state species. The joint scalar PDF equations were solved using moving particles in a Lagrangian framework and the velocity field was closed at the second moment level. The redistribution terms were modelled using the Generalized Langevin model of Haworth and Pope. Results show that scalar fields are reproduced with encouraging accuracy and that the revised time scale model improves agreement with experimental data. A high sensitivity to the NO chemistry was observed and encouraging agreement was obtained for the first two moments following adoption of updated reaction rates proposed in an earlier study.

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“…The N 2 O route is unimportant at low pressures, [10] and even at high pressures the maximum contribution was reported to be slightly over 11 per cent for a CH 4 /air counter ow diffusion ame [21]. The relative contribution from different pathways depends on fuel type, temperature, pressure and residence time [13]. The high NO levels that occur in practical systems can only be reduced by reducing the thermal NO formation.…”

Section: Flamelet-based No Modellingmentioning

confidence: 99%

Modelling of a bluff body stabilized CH₄/H₂ flame based on a laminar flamelet model with emphasis on NO prediction

Hossain

Malalasekera

2003

Proceedings of the Institution of Mechanical Engineers, Part A:

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• This is an article from the journal, Proceedings of the Institution of Me- Abstract: A laminar amelet model prediction of a bluff body stabilized CH 4 /H 2 ame is reported. The predicted results of temperature and major and minor species as well as NO are compared against the Raman/ Rayleigh/LIF data available from the University of Sydney. The effect of differential diffusion is also studied. The calculation shows that temperature and concentration of major and minor species are better predicted by the unity Lewis number amelet. It is also shown that the current steady state amelet approach has dif culties in predicting experimental NO levels.

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Measurements of no in turbulent non-premixed flames stabilized on a bluff body

Cited by 32 publications

References 10 publications

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Transported PDF Modelling of a High Velocity Bluff-Body Stabilised Flame (HM2) Using Detailed Chemistry

Modelling of a bluff body stabilized CH₄/H₂ flame based on a laminar flamelet model with emphasis on NO prediction

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Measurements of no in turbulent non-premixed flames stabilized on a bluff body

Cited by 32 publications

References 10 publications

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Parallel Adaptive Mesh Refinement Scheme for Three-Dimensional Turbulent Non-Premixed Combustion

Transported PDF Modelling of a High Velocity Bluff-Body Stabilised Flame (HM2) Using Detailed Chemistry

Modelling of a bluff body stabilized CH4/H2 flame based on a laminar flamelet model with emphasis on NO prediction

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Modelling of a bluff body stabilized CH₄/H₂ flame based on a laminar flamelet model with emphasis on NO prediction