Numerical investigation on effects of fuel tube diameter and co-flow velocity in a methane/air non-premixed flame

Soloklou, Mohsen Nasiri; Golneshan, Ali Akbar

doi:10.1007/s00231-019-02805-9

Cited by 7 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Turbulence level also explains part of the differences observed between the simulations. Indeed, the lower efficiency of the micro-scale mixing between the gas and oxygen can explain the enlargement of the temperature profile at the expense of its sharpness in Case 2 [72,73]. Similar results were reported for other feedstocks combustion in different reactors [74][75][76].…”

Section: Axial Temperature Profilesupporting

confidence: 82%

A Numerical Study of Turbulent Combustion of a Lignocellulosic Gas Mixture in an Updraft Fixed Bed Reactor

et al. 2022

View full text Add to dashboard Cite

Lignocellulosic biomass is an established source of energy with various applications. Yet, its diversity renders the proper combustion of its thermochemical degradation vapors challenging. In this work, the combustion of syngas obtained from biomass thermochemical conversion was numerically investigated to limit pollutant emission. The Computational Fluid Dynamics (CFD) simulation was performed using the open-source OpenFOAM. The reactor was considered in an axisymmetric configuration. The gas mixture resulting from the pyro-gasification devolatilization was composed of seven species: CO, CO2, H2O, N2, O2, light, and heavy hydrocarbon, represented by methane (CH4) and benzene (C6H6), respectively. The evolutions of mass, momentum, energy, and species’ concentrations were tracked. The flow was modeled using the RANS formulation. For the chemistry, reduced kinetic schemes of three and four steps were tested. Moreover, the Eddy Dissipation Concept (EDC) model was used to account for the turbulence–chemistry interaction. The numerical prediction enabled us to describe the temperature and the species. Results show that all transported variables were closely dependent on the mass flow rate of the inflow gas, the primary and the secondary air injections. Finally, from a process perspective, the importance of the secondary air inlet to limit pollutants emissions can be concluded.

show abstract

Section: Axial Temperature Profilesupporting

confidence: 82%

A Numerical Study of Turbulent Combustion of a Lignocellulosic Gas Mixture in an Updraft Fixed Bed Reactor

et al. 2022

View full text Add to dashboard Cite

show abstract

“…For NO x reduction and to avoid safety risks related to the high hydrogen-air flame speed (up to 50 m/s) and low quenching diameters (up to 0.5 mm), required to ensure prevention of the flashback in case of the fully premixed burner concepts, several micro-mixers or micro-nozzle burner solutions were recently patented and results of their operation reported in the literature [1][2][3]. To optimize the flame stability and combustion properties of H 2 , a common approach is the modification of the burner or nozzle geometry [4][5][6]. In this regard, previous studies deal with the comparison of different combustion models using detailed chemistry and concluded that the reduced reaction mechanism method showed the best agreement with experiments in terms of capturing and mapping the typical flame structure [3,7].…”

Section: Introductionmentioning

confidence: 99%

Simulation of a Hydrogen-Air Diffusion Flame under Consideration of Component-Specific Diffusivities

2022

View full text Add to dashboard Cite

This work deals with the numerical investigation of a three-dimensional, laminar hydrogen-air diffusion flame in which a cylindrical fuel jet is surrounded by in-flowing air. To calculate the distribution of gas molecules, the model solves the species conservation equation for N-1 components, using infinity fast chemistry and irreversible chemical reaction. The consideration of the component-specific diffusion has a strong influence on the position of the high-temperature zone as well as on the concentration distribution of the individual gas molecules. The calculations of the developed model predict the radial and axial species and temperature distribution in the combustion chamber comparable to those from previous publications. Deviations due to a changed burner geometry and air supply narrow the flame structure by up to 50% and the high-temperature zones merge toward the central axis. Due to the reduced inflow velocity of the hydrogen, the high-temperature zones develop closer to the nozzle inlet of the combustion chamber. As the power increases, the length of the cold hydrogen jet increases. Furthermore, the results show that the axial profiles of temperature and mass fractions scale quantitatively with the power input by the fuel.

show abstract

Increasing the exergetic efficiency in combustion chambers of gas turbines by modelling thermal energy transfer using entropy generation based on gibbs equation PDF-based

Arabahmadi

Mohammadiun

et al. 2022

J Therm Anal Calorim

View full text Add to dashboard Cite

Numerical investigation on effects of fuel tube diameter and co-flow velocity in a methane/air non-premixed flame

Cited by 7 publications

References 31 publications

A Numerical Study of Turbulent Combustion of a Lignocellulosic Gas Mixture in an Updraft Fixed Bed Reactor

A Numerical Study of Turbulent Combustion of a Lignocellulosic Gas Mixture in an Updraft Fixed Bed Reactor

Simulation of a Hydrogen-Air Diffusion Flame under Consideration of Component-Specific Diffusivities

Increasing the exergetic efficiency in combustion chambers of gas turbines by modelling thermal energy transfer using entropy generation based on gibbs equation PDF-based

Contact Info

Product

Resources

About