An efficient PDF calculation of flame temperature and major species in turbulent non-premixed flames

Amani, E.; Nobari, M.R.H.

doi:10.1016/j.apm.2009.10.032

Cited by 12 publications

(2 citation statements)

References 43 publications

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“…For the simulation of hydrocarbon fuel combustion, several models are available that can be combined with the high-temperature reaction schemes. More sophisticated models are available to achieve that purpose, such as the turbulent flame speed closure combustion model (TFSCM), eddy dissipation (ED) model, probability density function (PDF), and eddy breakup (EBU) model . Venuturumilli and Chen performed a CFD analysis of axisymmetric laminar diffusion (non-premixed) methane flames using a four-step reduced mechanism and its starting mechanism.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of One Air-Fired and Two Oxy-Fuel Combustion Cases of Propane in a 100 kW Furnace

Al-Abbas

Naser

2012

Energy Fuels

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A computational fluid dynamics (CFD) modeling study has been carried out. The study involved gaseous fuel combustion with associated chemical reactions, radiative heat transfer, and turbulence. The three different combustion environments that were adopted experimentally in a 100 kW drop-tube firing unit were examined. One air-fired and two oxy-fuelfired cases [21 vol % O 2 for one combustion case (OF21) and 27 vol % O 2 for the other combustion case (OF27)] were investigated. A swirl injection system was used to achieve the flame stability of the turbulent non-premixed combustible gases. A modified eddy breakup (EBU) model was used with appropriate empirical coefficients for propane combustion reactions. The irreversible single-step and reversible multi-step reaction mechanisms were considered. The overall agreement of the CFD results with the available measured data was reasonable. The data compared were the temperature distributions and the species concentrations (CO 2 , CO, and O 2 ) at the most intensive combustion locations in the furnace. The luminous appearance and temperature levels of the OF27 flame were relatively close to the reference (air-fired) flame. This was due to a reduced volumetric flow rate and an increase in the O 2 concentration in the gas mixture. The carbon dioxide concentrations for both oxyfuel-fired scenarios were around 8 times higher than that of the air-fired combustion case. The results obtained with the multistep chemistry mechanism showed improved agreement, particularly in the flame zone. The concentration of CO was lower in the OF21 case. The unburnt fuel in the air-fired and OF27 cases was less than that of the OF21 case because of the low oxygen concentration used in the latter combustion case. This study can provide a basis for the future investigation of combustion characteristics in a large-scale furnace under oxy-fuel-firing conditions.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of One Air-Fired and Two Oxy-Fuel Combustion Cases of Propane in a 100 kW Furnace

Al-Abbas

Naser

2012

Energy Fuels

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“…The numerical calcu lations of flame temperature and species concentrations in methane/air non-premixed flames using the standard k-ε model for modeling the flow field and a probability density function (PDF) for the scalar fields was performed by Amani and Nobari [ 15]. Simu lation was also done by Reynolds Average Naveir Stockes Equations (RANS).…”

Section: Department Of Mechanical Power Engineering Faculty Ofmentioning

confidence: 99%

Flow Field and Combustion Characteristics of Natural Gas inside a Gas Turbine Combustor

Abdel-Rahman

Shaaban

Shehata

et al. 2013

Port-Said Engineering Research Journal

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The present work is numerical simulat ion results from the modeling of a non-premixed natural gas flame performed in a co mbustor model. CFD studies using FLUENT code were carried out for d ifferent air swirl numbers and inlet thermal load with constant A/F. The isothermal flo w field was simulated using (SST) k-ω turbulence model and the reacting flow was simulated by the non-premixed combustion model with the P-1 radiation model available in the computational fluid dynamics package Fluent 6.3. The model geometry was created and meshing arrangement was generated using Gamb it pre-processing software. The domain of the model was based on the dimension of the combustor and burners. The case studied is a cylindrical enclosure of 0.1 m radius and 1.0 m length. Two reactant streams emerge fro m two separate coaxial jets producing a swirling diffusion flame. The natural gas is issued axially into the combustor fro m the annulus area between the swirler outer diameter and the burner hub diameter whereas the combustion air is introduced through an annular swirler having uniform swirl vanes. The results show a reasonable agreement of the measured and the calculated reverse flow zone sizes using the shear stress transport (SST) k-ω model. The boundary of the reverse flo w zone for weak air swirl nu mber of 0.5 is formed co mpletely inside the co mbustor with closed loop, while for air swirl numbers of 0.87 and 1.5 the boundaries fill the co mbustor and its size increased as the air swirl nu mber increased. Increasing the air swirl number, the high temperature regions size, the flame length, and the CO 2 and CO concentrations decreased while the O 2 concentration increased. Increasing the thermal load, the high temperature reg ions size, the flame length, CO 2 and CO concentrations increased, while the O 2 concentration decreased.

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Combustion and Radiation Modeling of Non-premixed Turbulent DLR-A Flame

Kumar,

Bansal

2024

Lecture Notes in Mechanical Engineering

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An efficient PDF calculation of flame temperature and major species in turbulent non-premixed flames

Cited by 12 publications

References 43 publications

Numerical Study of One Air-Fired and Two Oxy-Fuel Combustion Cases of Propane in a 100 kW Furnace

Numerical Study of One Air-Fired and Two Oxy-Fuel Combustion Cases of Propane in a 100 kW Furnace

Flow Field and Combustion Characteristics of Natural Gas inside a Gas Turbine Combustor

Combustion and Radiation Modeling of Non-premixed Turbulent DLR-A Flame

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