Numerical study of CO2 effects on laminar non-premixed biogas flames employing a global kinetic mechanism and the Flamelet-Generated Manifold technique

Hoerlle, Cristian Alex; Zimmer, Leonardo; Pereira, Fernando M.

doi:10.1016/j.fuel.2017.04.049

Cited by 8 publications

(5 citation statements)

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“…The comparison between FCO 2 and CO 2 dilution reveals that both thermal and chemical effects of diluent addition decrease H mass fraction in all axial locations. In methane combustion system, four reactions have the most impacts on the flame characteristics because of their high rates [10]. The reaction numbers are similar to the sequence in GRI-Mech 2.11.…”

Section: Dilution Effectsmentioning

confidence: 55%

“…The reaction numbers are similar to the sequence in GRI-Mech 2.11. The reaction R99 is introduced as the main reaction responsible for the chemical effects of CO 2 dilution by several authors [4,6,8,10].…”

Section: Dilution Effectsmentioning

confidence: 99%

“…Glaborg and Bentzen [9] showed that in an oxy-fuel combustion system, the concentration of CO increases in the near burner regions. Hoerlle et al [10] evaluated the effects of CO 2 addition to the fuel stream for a co-flow flame configuration. Their results depicted that a decrease in flame length, temperature, and CO mass fraction increases the volume rate of the diluent.…”

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confidence: 99%

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A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Vakilipour

Tohidi

Al-Zaili

et al. 2019

Appl. Math. Mech.-Engl. Ed.

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The turbulent combustion flow modeling are performed to study the impacts of CO 2 addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame SM1. A flamelet approach along with three well-known turbulence models are utilized to model the turbulent combustion flow field. The k−ω SST shows the best agreement with the experimental fields compared to other methods. Then, the k−ω SST is employed to study the effects of CO 2 dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO 2 dilution, a fictitious species is replaced with the regular CO 2 in both fuel and oxidizer streams.The results indicate that the flame temperature is decreased when CO 2 is added to either fuel or oxidizer streams. The flame length reduction is observed at all levels of CO 2 dilution. The H radical concentration indicating the flame strength decreases following by the thermochemical effects of CO 2 dilution processes. In comparison with fictitious species dilution, chemical effects of CO 2 addition enhance CO mass fraction. The numerical simulations show that by increasing the

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Section: Dilution Effectsmentioning

confidence: 55%

Section: Dilution Effectsmentioning

confidence: 99%

mentioning

confidence: 99%

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A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Vakilipour

Tohidi

Al-Zaili

et al. 2019

Appl. Math. Mech.-Engl. Ed.

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“…A combustão é um processo complexo que ocorre através de reações químicas entre combustível e oxidante. A combustão pode ser com ou sem chamas, laminar ou turbulenta, lenta ou rápida, dependendo das condições usadas e como a mistura dos reagentes ocorre (De Bortoli, 2009;Hoerlle et al, 2017).…”

Section: Introductionunclassified

Simulação Numérica De Chamas Difusivas De Hidrogênio Através Das Equações de Navier-Stokes

Jesus

Quadros

Buske

2021

CeN

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A procura por novas fontes de combustíveis alternativos, para substituir o uso de combustíveis fósseis e diminuir a emissão de gases, tem aumentado nos últimos anos. O hidrogênio tem se tornado cada vez mais um combustível alternativo interessante, pois não produz gás de efeito estufa CO2 e oferece potencial de redução de poluentes NOX e pode aumentar a economia de combustível quando usado em misturas de hidrocarbonetos. Neste trabalho foi realizado a simulação numérica para chamas difusivas de hidrogênio no interior de uma câmara de combustão no formato retangular. Portanto, foram aplicadas as equações reativas de Navier-Stokes, fração de mistura para o fluxo e para a parte química o método Flamelet. Para a modelagem da turbulência, foram usados a técnica conhecida como simulação em grandes escalas (LES), e o método de diferenças finitas para discretizar as equações. Também foram realizadas simplificações e adimensionalizações nos termos das equações com a finalidade de diminuir a complexidade do problema. Os resultados numéricos obtidos foram comparados com dados encontrados na literatura, estão em concordância com estes.

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“…Investigation on syngas diffusion flames has been widely addressed in literature, with focus on the combustion of individual syngas components [4], hydrogen fuels [5] airstream dilution [6], the influence of primarily CO 2 dilution [7] or methane-air diffusion flames in a counter-flow setup [8]. In this study experiments and numerical simulation on laminar counter-flow diffusion flames are combined.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of Laminar One-Dimensional Counter-Flow Flames Using Product Gas From Pyrolysis and Gasification of Woody Biomass

Scharl¹,

Greenhalgh²,

Dieguez-Alonso³

et al. 2018

Eurasian Chem. Tech. J.

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Further advances in the utilization of biomass-based gaseous fuels in combustion systems require a deeper understanding of the combustion chemistry behind, as well as of the coupling of the chemistry with physical phenomena such as turbulence. The former is investigated in the present study combining both experiments with numerical simulations of different types of laminar non-premixed flames (sooting and non-sooting) in a counter-flow setup. The focus is put on synthetic gas mixtures, resembling, to different extents, typical compositions of the product gas obtained in biomass gasification consisting of CH4 (reference) and CH4 mixed with CO2, N2, O2, and/or H2, always. The oxidizer in all cases is air. A wide range of air-fuel ratios is considered. The influence of the product gas composition on the flame behaviour and flame structure with respect to the changes of the species profiles and peak temperatures with changing flow velocities is discussed. Laser-based spectroscopy techniques, in particular laser-induced Rayleigh scattering and laser-induced fluorescence (LIF), are applied as diagnostic tools. The former can provide an accurate understanding of temperature distributions, while the latter helps to identify the flame front through the tracking of intermediate species, such as CH2O (formaldehyde). Additionally, CH* chemiluminescence contributes to localize the flame front. Lastly, the influence of the N2-shroud flow velocities and diameters, as well as resulting buoyancy effects due to a raise in temperature, are taken into account. In correspondence to these experiments, the flames are numerically simulated by an in-house time-dependent implicit Fortran code.

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Numerical study of CO2 effects on laminar non-premixed biogas flames employing a global kinetic mechanism and the Flamelet-Generated Manifold technique

Cited by 8 publications

References 50 publications

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

Simulação Numérica De Chamas Difusivas De Hidrogênio Através Das Equações de Navier-Stokes

Numerical and Experimental Investigation of Laminar One-Dimensional Counter-Flow Flames Using Product Gas From Pyrolysis and Gasification of Woody Biomass

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