Simulation of flame speed enhancement of a hydrocarbon flame with a microwave field

Chen, Bang-Shiuh; Garner, Allen L.; Bane, Sally P.

doi:10.1016/j.combustflame.2019.06.002

Cited by 13 publications

(6 citation statements)

References 45 publications

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“…The simulations have been performed for one/two-dimensional co-flow flames, counterflow flames and premixed flames subject to DC/AC electric field. These simulations have confirmed the existence of the ion-driven winds, showing that the flame structure [32], flame stability [33] and [37] propagation speed can be modulated in the presence of an electric field.…”

Section: Introductionsupporting

confidence: 61%

“…Modelling approaches have also been developed to predict the combustion in the presence of an external electric field. Many studies have employed the framework of computational fluid dynamics (CFD) to account for the following effects: the electric intensity induced by the external electric field and the electrostatic field of ions, the electrostatic force exerting on the fluid, an additional drift velocity of ions and the ohmic heating [31][32][33][34][35][36][37]. The simulations have been performed for one/two-dimensional co-flow flames, counterflow flames and premixed flames subject to DC/AC electric field.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the electric field on soot formation in combustion: A coupled charged particle PBE-CFD framework

Liu

Luo

Rigopoulos

et al. 2022

Combustion and Flame

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Effects of the electric field on soot formation in combustion: A coupled charged particle PBE-CFD framework

Liu

Luo

Rigopoulos

et al. 2022

Combustion and Flame

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“…. ) [181][182][183]185,187,188]. The industrial systems that could benefit from PAC strategies are mainly gas turbines, aero-engines, flares, and burners.…”

Section: Plasma-assisted Combustionmentioning

confidence: 99%

Non-equilibrium plasma for ignition and combustion enhancement

2021

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This review is intended to give an overview of recent results on plasma-assisted ignition and combustion. The influence of electrical discharges on combustion processes is introduced, and the excited species and radicals present in large quantity in the plasma are detailed. A description of theoretical problems related to modeling plasma-assisted combustion is given, elucidating the role of excited states in enhancing the reaction rates. Then some experiments are reported, focused on fundamental aspects on the effects of high pressure discharges in improving the ignition of combustion. To conclude, some applications for plasma-assisted combustion and detonation are presented, activated by different kinds of discharges.

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“…The results show a potential increase of energy efficiency in combined systems from electric and fuel heating. In addition, the ohmic heating seems to increase the flame temperature, which seems to be the primary mechanism for increasing the burning velocity (Chen et al 2019). In addition, experiments were carried out with continuous microwave irradiation (Hong-Yuan and Yei-Chin 2017).…”

Section: Introductionmentioning

confidence: 99%

Effects of Microwaves on Burning Velocity, UV–VIS-Spectra, and Exhaust Gas Composition of Premixed Propane Flames

Eckart

Dasari²,

Collins³

et al. 2023

Flow Turbulence Combust

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Microwaves can interact with the flame’s combustion zone and increase the energy density. This induces changes to the combustion properties by influencing the radical formation and significantly expanding the flame thickness. It is possible to combust low calorific gas mixtures in a stable process without preheating or co-firing with microwave assistance. Furthermore, the hybrid heating of gaseous fuels and electrical energy offers a solution for the improved use of volatile energy sources and the further improvement of the efficiencies of thermal systems. Moreover, microwaves can be used to heat materials internally, and when coupled with external heating, contribute to a more homogeneous process. This can be particularly beneficial in the glass industry and metal processing. However, the literature on basic behaviour of this coupling such as dielectric properties for higher temperature is limited, which prevents a comprehensive evaluation of the application potential. Thus, investigations with a newly designed, externally cooled, and symmetric resonator were conducted. Furthermore, the optimized resonator was improved by installing ports for burner installation and filter elements for exhaust gas probing and optical access. An axisymmetric burner was designed to generate a steady conical laminar premixed flame, which is stabilized on the outlet of a contoured nozzle. Combustion regimes with propane/air were tested within a range of equivalence ratios from 0.9 to 1.5. Experiments were carried out with an initial temperature of 298 K under atmospheric pressure and with microwave inlet power with a range of 200 to 800 W. The optical techniques used in the current survey are based on flame contour detection using OH* chemiluminescence imaging. Additionally, spectrally resolved flame emission measurement techniques were used to monitor excited state species. Significantly increased production rates of OH*, C2*, and CH* radicals were measured when there was an increased microwave power. The amount of NOx and CO were increased by 20% and 55% respectively in the exhaust gas, which was determined experimentally using a probe method. Numerical simulations of the electromagnetic field and its influence on combustion were carried out to confirm these findings. This enhanced reactivity by 22%, resulted in higher burning velocity, and provided knowledge on the emission performance of the combustion process under microwave influence. The numerical electromagnetic simulations using FEKO produced results that are consistent with the experimental results.

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Simulation of flame speed enhancement of a hydrocarbon flame with a microwave field

Cited by 13 publications

References 45 publications

Effects of the electric field on soot formation in combustion: A coupled charged particle PBE-CFD framework

Effects of the electric field on soot formation in combustion: A coupled charged particle PBE-CFD framework

Non-equilibrium plasma for ignition and combustion enhancement

Effects of Microwaves on Burning Velocity, UV–VIS-Spectra, and Exhaust Gas Composition of Premixed Propane Flames

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