The detailed flame structure of highly stretched turbulent premixed methane-air flames

Chen, Yung-Cheng; Peters, N.; Schneemann, G.A.; Wruck, Norbert M.; Renz, Ulrich; Mansour, Mohy S.

doi:10.1016/s0010-2180(96)00070-3

Cited by 201 publications

(204 citation statements)

References 14 publications

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“…In this work, the three piloted turbulent premixed Bunsen flames studied by Chen et al [54] are investigated. The most stretched flame, denoted F1, is located at the borderline to the well stirred reactor regime while the less stretched F3 flame is located in the thin reaction zone regime, close to the borderline of the flamelet regime [54].…”

Section: Test Casementioning

confidence: 99%

“…The most stretched flame, denoted F1, is located at the borderline to the well stirred reactor regime while the less stretched F3 flame is located in the thin reaction zone regime, close to the borderline of the flamelet regime [54]. This set of flames has been widely studied in the literature, and RANS simulations of all F1-F3 flames have been reported [24,25,[55][56][57][58][59][60], however to the authors' knowledge only three LES simulations have been reported [11,31,82] and mostly on the lower Reynolds number flame F3.…”

Section: Test Casementioning

confidence: 99%

“…The three flames are generated with the same burner. Table 1 presents the mean nozzle exit velocities, the corresponding Reynolds numbers, and the centreline turbulent kinetic energy values, as provided by experimental measurements [54]. The burner design is shown schematically in Figure 1.…”

Section: Test Casementioning

confidence: 99%

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Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Dodoulas

Navarro‐Martinez

2013

Flow Turbulence Combust

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Abstract. In the present study a Large Eddy Simulation and Filtered Density Function model is applied to three premixed piloted turbulent methane flames at different Reynolds Numbers using the Eulerian stochastic fields approach. The model is able to reproduce the flame structure and flow characteristics with a low number of fields (between 4 and 16 fields). The results show a good agreement with experimental data with the same closures employed in non-premixed combustion without any adjustment for combustion regime. The effect of heat release on the flow field is captured correctly. A wide range of sensitivity studies is carried out, including the number of fields, the chemical mechanism, differential diffusion effects and micro-mixing closures. The present work shows that premixed combustion (at least in the conditions under study) can be modelled using LES-PDF methods.. Finally, the ability of the model to predict flame quenching is studied. The model can accurate capture the conditions at which combustion is not sustainable and large pockets of extinction appear.

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Section: Test Casementioning

confidence: 99%

Section: Test Casementioning

confidence: 99%

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Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Dodoulas

Navarro‐Martinez

2013

Flow Turbulence Combust

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“…The distributed flames of [6][7][8] are confined by periodic lateral boundary conditions, which means there is a pool of hot fluid that is mixed with the fuel by fullydeveloped turbulence. The Bunsen flames of [9][10][11][12] and the single vortex-flame interactions of [13,14] that extinguish at high Karlovitz number, all experience large-scale global mean stretch, which is the likely explanation for the difference in behavior.…”

Section: Introductionmentioning

confidence: 99%

Lewis number effects in distributed flames

Aspden

Day

Bell

2011

Proceedings of the Combustion Institute

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Recent computational studies have simulated a mode of distributed premixed combustion where turbulent mixing plays a significant role in the transport of mass and heat near the reaction zone. Under these conditions, molecular transport processes play a correspondingly smaller role. A consequence of burning in this regime is that a change in the gas mixture composition can occur within the flame zone, which modifies the burning rate. The composition depends on the Lewis number (ratio of molecular heat to mass diffusivity), and so the response to the transition to distributed burning will be different for fuels with different Lewis numbers. In this paper, we examine the role of Lewis number on flames in the distributed burning regime. We use high-resolution three-dimensional flame simulations with detailed transport models to explore the turbulent combustion of a range of fuels, specifically lean premixed hydrogen, methane and propane mixtures. The response of the burning rate is found to be more pronounced in hydrogen than in the other fuels.

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“…Many others [11][12][13][14][15][16][17][18] have used this flame configuration. Many of these studies involved temperature and velocity measurements [11][12][13][14]16].…”

Section: Axisymmetric Premixed Turbulent Flamesmentioning

confidence: 99%