Effect of CO2 and N2 dilution on laminar premixed MTHF/air flames: Experiments and kinetic studies

Sahu, Amrit Bikram; Wang, Chongming; Jiang, Changzhao; Xu, Hongming; Ma, Xiao; Xu, Cangsu; Bao, Xiuchao

doi:10.1016/j.fuel.2019.115659

Cited by 16 publications

(10 citation statements)

References 56 publications

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“…This suggests that when adding DMF to iso-octane, thermal diffusion instability tends to develop. Furthermore, the initial pressure had a negligible effect on the density ratio (Figure 9), while the flame thickness tended to decrease with increasing initial pressure (Wu et al, 2011) (Sahu et al, 2019). This is because of the smaller degree of Zeldovich number's variation (Ze) with the pressure compared with the flame thickness (Egolfopoulos et al, 2014).…”

Section: Flame Instabilitiesmentioning

confidence: 96%

Laminar Flame Characteristics of 2,5-Dimethylfuran (DMF) Biofuel: A Comparative Review with Ethanol and Gasoline

Hoang

Nguyen

Truong

et al. 2021

Int. J. Renew. Energy Dev.

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Since the early years of the 21st century, the whole world has faced two very urgent problems: the depletion of fossil energy sources and climate change due to environmental pollution. Among the solutions sought, 2,5-Dimethylfuran (DMF) emerged as a promising solution. DMF is a 2nd generation biofuel capable of mass production from biomass. There have been many studies confirming that DMF is a potential alternative fuel for traditional fuels (gasoline and diesel) in internal combustion engines, contributing to solving the problem of energy security and environmental pollution. However, in order to apply DMF in practice, more comprehensive studies are needed. Not out of the above trend, this paper analyzes and discusses in detail the characteristics of DMF's combustible laminar flame and its instability under different initial conditions. The evaluation results show that the flame characteristics of DMF are similar to those of gasoline, although the burning rate of DMF is much higher than that of gasoline. This shows that DMF can become a potential alternative fuel in internal combustion engines.

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Section: Flame Instabilitiesmentioning

confidence: 96%

Laminar Flame Characteristics of 2,5-Dimethylfuran (DMF) Biofuel: A Comparative Review with Ethanol and Gasoline

Hoang

Nguyen

Truong

et al. 2021

Int. J. Renew. Energy Dev.

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“…In terms of experiments, researches on CO 2 dilution can be found in papers 25–32 . Lee et al 25 compared the dilution effects of N 2 , CO 2 , and steam on the combustion performance of H 2 ‐CO flame.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the combustion efficiency is good in most of the tested cases. Sahu et al 32 carried out experimental and numerical research to investigate the effect of N 2 and CO 2 dilution on premixed MTHF/ air flames characteristics. They found CO 2 has a more significant influence on flame speed reduction than N 2 .…”

Section: Introductionmentioning

confidence: 99%

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Suppression of thermoacoustic instability and NOx emissions of unsteady swirl premixed flame with upstream microjets

Zhou

2022

Asia-Pacific J Chem Eng

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Passive control methods are widely used in unsteady combustion systems due to their robustness and convenience. This paper used the upstream microjets method for the first time to control thermoacoustic instability and pollutant NOx emissions in unsteady swirl premixed flame. Three variables of CO 2 microjets flow rate, upstream microjets distance, and microjets number are investigated. Results demonstrate the upstream microjets distance plays a significant role in restraining the thermoacoustic instability and NOx emissions. The smaller the upstream microjets distance, the more completely the thermoacoustic instability is suppressed while the NOx emissions are the opposite, which means a compromise choice needs to be made between them. The damping ratio of pressure amplitude in the chamber can reach the maximum of 81.3%, and the damping ratio of CH* intensity can reach the maximum of 80.2%. Besides, the frequency of pressure and CH* will transit to a lower mode. NOx emissions can realize a maximum reduction of 12.2 ppm. Meanwhile, the flame mode switches from an enlarged Mode-A flame to a shrunk Mode-B flame, and the flame length shows a maximum reduction of 14 mm at the largest upstream distance. However, the specific control mechanism under upstream microjets still needs further study to clarify. This research proved the feasibility of suppressing combustion instability and NOx emissions with upstream microjets in unsteady swirl premixed flame, promoting its practical application in gas turbine systems.flame mode, NO x emissions, thermoacoustic instability, unsteady swirl premixed flame, upstream microjets | INTRODUCTIONAs a complex multidisciplinary problem, combustion instability was first proposed by scholar Rayleigh. 1 When combustion instability occurs, it is often accompanied by periodic large pressure oscillations. 2,3 The power engines in gas turbines, industrial furnaces, and rockets will face the threat of damage or even failure.To prevent the occurrence of combustion instability, researchers often implement control strategies from the two necessary factors of combustion instability, namely, acoustic oscillations and heat release oscillations. For

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“…These gases make the chemical reaction rate drop significantly and combustion process out of the normal flame-let regime more easily [4][5][6][7][8][9][10][11]. Recently, many studies about the effect of dilution on the characteristics of combustion have been performed, such as turbulent burning velocity, flame stability, flame structure, and pollution emission [2,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

et al. 2020

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Diluting the combustion mixtures is one of the advanced approaches to reduce the NOx emission of methane/air premixed turbulent flame, especially with high diluents to create a distributed reaction zone and mild combustion, which can lower the temperature of reaction zone and reduce the formation of NOx. The effect of N2/CO2 dilution on the combustion characteristics of methane/air premixed turbulent flame with different dilution ratio and different exit Reynolds number was conducted by OH-PLIF and CH2O-PLIF. Results show that the increase of dilution ratio can sharply reduce the concentration of OH and CH2O, and postpone the burning of fuel. Compared with the ultra-lean combustion, the dilution weakens the combustion more obviously. For different dilution gases, the concentration of OH in the combustion zone varies greatly, while the concentration of CH2O in the unburned zone is less affected by different dilution gas. The CO2 dilution has a more significant effect on OH concentration than N2 with the given dilution ratio, but a similar effect on the concentration of CH2O in the preheat zone of flame. However, dilution does not have much influence on the flame structure with the given turbulent intensity.

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Effect of CO2 and N2 dilution on laminar premixed MTHF/air flames: Experiments and kinetic studies

Cited by 16 publications

References 56 publications

Laminar Flame Characteristics of 2,5-Dimethylfuran (DMF) Biofuel: A Comparative Review with Ethanol and Gasoline

Laminar Flame Characteristics of 2,5-Dimethylfuran (DMF) Biofuel: A Comparative Review with Ethanol and Gasoline

Suppression of thermoacoustic instability and NOx emissions of unsteady swirl premixed flame with upstream microjets

Investigation of Dilution Effect on CH4/Air Premixed Turbulent Flame Using OH and CH2O Planar Laser-Induced Fluorescence

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