Comparison of Combustion Models for Lifted Hydrogen Flames within RANS Framework

Benim, Ali Cemal; Pfeiffelmann, Björn

doi:10.3390/en13010152

Cited by 9 publications

(10 citation statements)

References 54 publications

(65 reference statements)

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“…Hence, simulations of combustion of a complex fuel under gas turbine conditions are very demanding and time consuming, even on a super-computer. An attractive alternative that requires significantly less computational power is to solve the Reynolds Averaged Navier-Stokes (RANS) equations combined with a suitable combustion model (Benim and Pfeiffelmann 2019). This method does not resolve all the fine details that a LES simulation does, neither is it capable of predicting all of the phenomena that a LES simulation can capture, e.g.…”

Section: Tablementioning

confidence: 99%

On the Flame Shape in a Premixed Swirl Stabilised Burner and its Dependence on the Laminar Flame Speed

Papafilippou

Chishty

Gebart

2021

Flow Turbulence Combust

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Gas turbines for power generation are optimised to run with fossil fuels but as a response to tighter pollutant regulations and to enable the use of renewable fuels there is a great interest in improving fuel flexibility. One interesting renewable fuel is syngas from biomass gasification but its properties vary depending on the feedstock and gasification principle, and are significantly different from conventional fuels. This paper aims to give an overview of the differences in combustion behaviour by comparing numerical solutions with methane and several different synthesis gas compositions. The TECFLAM swirl burner geometry, which is designed to be representative of common gas turbine burners, was selected for comparison. The advantage with this geometry is that detailed experimental measurements with methane are publicly available. A two-stage approach was employed with development and validation of an advanced CFD model against experimental data for methane combustion followed by simulations with four syngas mixtures. The validated model was used to compare the flame shape and other characteristics of the flow between methane, 40% hydrogen enriched methane and four typical syngas compositions. It was found that the syngas cases experience lower swirl intensity due to high axial velocities that weakens the inner recirculation zone. Moreover, the higher laminar flame speed of the syngas cases has a strong effect on the flame front shape by bending it away from the axial direction, by making it shorter and by increasing the curvature of the flame front. A hypothesis that the flame shape and position is primarily governed by the laminar flame speed is supported by the almost identical flame shapes for bark powder syngas and 40% hydrogen enriched methane. These gas mixtures have almost identical laminar flame speeds for the relevant equivalence ratios but the heating value of the syngas is more than a factor of 3 smaller than that of the hydrogen enriched methane. The syngas compositions used are representative of practical gasification processes and biomass feedstocks. The demonstrated strong correlation between laminar flame speed and flame shape could be used as a rule of thumb to quickly judge whether the flame might come in contact with the structure or in other ways be detrimental to the function of the combustion system.

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Section: Tablementioning

confidence: 99%

On the Flame Shape in a Premixed Swirl Stabilised Burner and its Dependence on the Laminar Flame Speed

Papafilippou

Chishty

Gebart

2021

Flow Turbulence Combust

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“…In the paper, the turbulent flows were described with account of recommendations in [26][27][28], and the standard k-ε model [29][30][31] turbulence model was used.…”

Section: Methodsmentioning

confidence: 99%

Numerical Simulation of the Process of Combustion of a Stoichiometric Hydrogen-Oxygen Mixture in a Steam Generator

Авраменко

2021

Fr. Ukr. J. Chem.

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Numerical methods are used to study the process of combustion of a stoichiometric hydrogen-oxygen mixture. The mathematical models were validated using experimental data. The combustion process is modelled in the three-dimensional unsteady formulation. With account of the recommendations of other authors, the turbulent flows are described in the paper using the standard k-ε turbulence model. The Eddy Dissipation Model (EDM) is used to describe the process of combustion of the hydrogen-oxygen mixture. The description of the complex heat transfer between the gas, flame and walls in the paper accounts for radiant heat transfer by using the P1 model. The paper deals with combustion processes in a burner and a model steam generator. Numerical methods were used to evaluate the effect of inlet flow turbulisation, and the flow rate and the method of feeding extra water to the combustion chamber on the process of combustion of the stoichiometric hydrogen-oxygen mixture. The influence of the design and operating mode factors on the alteration of the flame-steam interface and on the flame extinguishing conditions were studied. The results obtained can be used in future in designing equipment that uses hydrogen as a fuel to increase nuclear power plant (NPP) manoeuvrability.

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“…In the present study, experimental data from Sautet et al [15] and Wu et al [16] were taken as a basis for non-reacting and reacting flows respectively. Benim et al [17] referred to the same experimental setups within their 2D study, a schematic drawing of which is shown in Fig. 1.…”

Section: Experimental Reference Casesmentioning

confidence: 99%

“…Although not optimized for hydrogen chemistry, GRI-Mech 3.0 can be considered partially validated for the stoichiometric combustion of hydrogen and air. Further increasing the variety of mechanisms covered by the recent 2D simulations from Benim et al [17], besides GRI-Mech 3.0 the mechanism by Jachimowski [22] was included in the present study. It features a comparably broad temperature range as for Li and Ó Conaire, whereas equivalence ratio and pressure are more limited.…”

Section: Chemical Reaction Mechanismsmentioning

confidence: 99%

A Numerical Study on Hydrogen Jet Flame Combustion in MILD Conditions

Planke

Farisco

Grimm

et al. 2023

AIAA SCITECH 2023 Forum

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A large degree of dilution and high temperatures are what characterizes MILD (Moderate or Intense Low oxygen Dilution) combustion. This regime is commonly prevailing in FLOX ® systems, where hot gases are recirculated in order to stabilize the combustion process. Current technical developments in the fight against climate change require combustion systems to run with high calorific and at the same time clean fuels, like hydrogen in particular. However, certain difficulties arise in the design process of energy conversion systems with the use of hydrogen. Especially in modeling and simulation, the choice of chemical reaction mechanisms and combustion models is critical. Therefore, in the present study, a jet flame test case is thoroughly investigated, mimicking a combustion situation that is present in FLOX ® based burners. Several reaction schemes and models are tested and results are validated with a large experimental data set. This study features an elaborate investigation of reaction schemes usable in combustor design phases and assesses their applicability in the leaner combustion regime to provide guidance for the design of hydrogen-based combustion systems for energy and aviation applications.

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Comparison of Combustion Models for Lifted Hydrogen Flames within RANS Framework

Cited by 9 publications

References 54 publications

On the Flame Shape in a Premixed Swirl Stabilised Burner and its Dependence on the Laminar Flame Speed

On the Flame Shape in a Premixed Swirl Stabilised Burner and its Dependence on the Laminar Flame Speed

Numerical Simulation of the Process of Combustion of a Stoichiometric Hydrogen-Oxygen Mixture in a Steam Generator

A Numerical Study on Hydrogen Jet Flame Combustion in MILD Conditions

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