Numerical simulation of methane-air equivalence ratio effect on premixed low swirl stabilized flame

Ouali, Sofiane; Bentebbiche, Abdelhalim; Belmrabet, Toufik

doi:10.1007/s40430-014-0202-7

Cited by 6 publications

(5 citation statements)

References 25 publications

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“…Further, Dong et al [38] studied the unstable characteristics of centrifugal pump with strong swirling flows and found that, overall, the standard k-ε model performed better than the RNG k-ε model and k-ω turbulence model. Both Ouali et al [30] and Elorf et al [39] implemented the standard k-ε model in simulations of swirl stabilized flame and obtained satisfactory agreement with experimental data. Thus, given the better agreement with the design methodology and shorter calculation time, the standard k-ε model was adopted as the turbulent model for the following simulations.…”

Section: Models and Simulation Setupmentioning

confidence: 83%

“…For turbulent simulation, although large-eddy simulation (LES) is considered to be a promising analysis tool for design applications [34][35][36][37], it is computationally demanding for problems with high Reynolds number (Re > 140,000) [24], and the three-dimensional geometry of the swirl burner is another challenge. In contrast, RANS turbulent models, such as standard k-ε model [30,38,39], RNG k-ε model [40,41] and realizable k-ε model [24,42,43], have been widely implemented in swirling flow simulations. The standard k-ε model assumes that the flow is fully turbulent, and it is suitable to simulate turbulence with high Reynolds number.…”

Section: Models and Simulation Setupmentioning

confidence: 99%

“…The pollutant emission characteristics of a swirl burner have been studied extensively [7,13,[27][28][29][30]. Rao [7] experimentally investigated the influence of thermal load and excess air factor on the NO x concentration of a high-heat and swirling gas burner.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [29] demonstrated that the optimization of gas mixing system can significantly reduce the pollutant emission. Ouali et al [30] carried out simulations to analyze the effect of methane-air equivalence ratio on thermal NO formation. In addition, Zhao et al [25] used a random sampling method to evaluate mixedness through the samples, which was randomly extracted from the experimental database.…”

Section: Introductionmentioning

confidence: 99%

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Design optimization and CFD evaluation of a volute swirl burner with central gas supply

Jia

Tang

2020

J Braz. Soc. Mech. Sci. Eng.

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The reasonable design and optimization can be useful tools to solve issues in several industrial applications. Since it is timeconsuming and costly to do the experimental performance assessment using various equipments, computational fluid dynamics (CFD) with suitable models has been widely used due to the good agreement with experiments. This paper presented a universal design calculation method of a volute swirl burner with central gas supply. Then, CFD simulations with standard k-ε model, under non-reacting and reacting conditions, were carried out to verify the design feasibility. The mixedness of gas/air under non-reacting condition was evaluated from the perspective of normal distribution in statistics and checked by the designed excess air factor. A parametric study for various mixing section lengths and outlet diameters of the burner block was conducted to investigate their influence on the central recirculation zone and the temperature distribution. Simulation results show good agreement with empirical formula calculation. The gas and air have been mixed uniformly around the location that is 60 times of the gas orifice diameter. Additionally, an enlarged recirculation zone with increased recirculation strength can be formed with the increasing mixing length and block outlet diameter. In combustion simulation, the longer mixing length improves the flame stabilization but makes the combustion center move to the upstream of the burner due to the strengthened recirculation zone. The larger outlet diameter of the block stretches the flame and moves the high-temperature zone inside the flame to the downstream of the block wall.

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Section: Models and Simulation Setupmentioning

confidence: 83%

Section: Models and Simulation Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design optimization and CFD evaluation of a volute swirl burner with central gas supply

Jia

Tang

2020

J Braz. Soc. Mech. Sci. Eng.

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“…The flame front along with the mass fractions were predicted very well. Ouali et al [29] used a presumed β probability density function (PDF) to study the premixed combustion. They studied the swirl and equivalence ratio effects on the flame and the emissions.…”

Section: Premixed Combustionmentioning

confidence: 99%

Effects of Swirl Number and Central Rod on Flow in a Lean Premixed Swirl Combustor

Yellugari,

Villalva Gomez,

Gutmark

2023

Combustion Science and Technology

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Gas turbine combustors are used to extract chemical energy from the combustion of fuel in presence of an oxidizer to power turbines. Environmental concerns provide motivation to develop more efficient and less polluting gas turbine engines. To achieve good emission performance, lean burn combustors with low pollutant emissions have been developed. These combustors operate at fuel lean conditions and they can be classified into lean premixed and pre-vaporized (LPP) combustor, where the fuel and oxidizer are premixed and pre-vaporized to form a homogeneous mixture in a dedicated region, premixer, just before the fuel-oxidizer mixture enters the combustion chamber, and lean direct injection (LDI) combustor, where the fuel is directly injected into the flame zone without any premixing with oxidizer [1]. The premixing and pre-vaporizing reduce the residence time, the amount of time the gases are in the combustion chamber. The reduction in residence time reduces the NO x emissions, as the high NO x emissions are produced with a long residence time in the combustion chamber.The flow behavior of non-reacting and reacting flow in a lean premixed swirl combustor, adapted from KAUST experimental rig, has been studied using RANS in the commercial software, Ansys -Fluent. Turbulence is modeled using the two equation realizable k − model and the turbulence -chemistry interaction is modeled by a flamelet generated manifold (FGM) technique. At first, non-reacting flow was simulated in lean premixed swirl combustor. These simulation results were compared to the experiments done by Sabatino et al. [2] and LES work of Maestro et al. [3]. This non-reacting flow solution was used as an initial condition to the reacting flow for a faster convergence of the solution, with methane-air mixture at an equivalence ratio of 0.67. GRI 3.0 mechanism was used for modeling chemistry, which had 325 i I specially thank Dr. Urmila Ghia, for supporting me all the time. I would like to thank Ohio Supercomputer Center for letting me use the resources.I would like to thank my friends and people from work, for being patient, cooperative and supportive all these years in Cincinnati. All this could not be possible without my parents and my older brother. I so grateful to my parents and my brother for always believing in me.Their unconditional love and support always made me to dream big and achieve my dreams with ease. Finally, I am so thankful to my Master and Sir for their continuous blessings and guidance throughout my life . v

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Computational Fluid Dynamics of Co-axial Unconfined Isothermal Swirling Jets

Pattanashetti

Santhosh

2020

Lecture Notes in Mechanical Engineering

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Numerical simulation of methane-air equivalence ratio effect on premixed low swirl stabilized flame

Cited by 6 publications

References 25 publications

Design optimization and CFD evaluation of a volute swirl burner with central gas supply

Design optimization and CFD evaluation of a volute swirl burner with central gas supply

Effects of Swirl Number and Central Rod on Flow in a Lean Premixed Swirl Combustor

Computational Fluid Dynamics of Co-axial Unconfined Isothermal Swirling Jets

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