Effect of syngas composition on high frequency combustion instability in a non-premixed turbulent combustor

Baraiya, Nikhil A.; Chakravarthy, Satyanarayanan R.

doi:10.1016/j.ijhydene.2019.01.115

Cited by 27 publications

(7 citation statements)

References 46 publications

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“…This increased wrinkling can result in increased flame area changes and thus enhanced combustion instabilities. These and other studies [5,[9][10][11][12][13][14] show that depending on combustor characteristics, hydrogen enrichment and fuel composition can have different effects on combustion instability. In an effort to further investigate the mechanisms that cause these variable results, recent studies have observed hydrogen enrichment effects on strain, flow field, and peak heat release locations.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dsupporting

confidence: 52%

“…Hydrogen enrichment has been shown to activate different instability mechanisms and alter the phase difference between heat release rate and combustor acoustics. Phase alteration can either inhibit [5,9,10] or enhance [11][12][13] combustion instabilities. For example, a study by Hong et al [9] showed that hydrogen addition to a propane flame reduced the phase coupling between pressure and heat release.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

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Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Strollo

Peluso

O’Connor

2021

Journal of Engineering for Gas Turbines and Power

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This paper examines the effects of steady-state and transient hydrogen enrichment on thermoacoustic instability in a model gas turbine combustor. Measurements of combustor chamber pressure fluctuations and CH* chemiluminescence imaging are used to characterize instability at a range of operating conditions. Steady-state tests show that both mixture heat rate and hydrogen content affect system stability. At a given heat rate, higher levels of hydrogen result in unstable combustion. As heat rate increases, instability occurs at lower concentrations of hydrogen in the fuel. Transient operation was tested in two directions - instability onset and decay - and two hydrogen-addition times - a short time of 1 millisecond and a longer time of 4 seconds. Results show that instability onset processes, through the transient addition of hydrogen, are highly repeatable regardless of the timescale of hydrogen addition. Certain instability decay processes are less repeatable, resulting in cases that do not fully transition from unstable to stable combustion despite similar changes in hydrogen fuel flow rate. Flame behavior before, during, and after the transient is characterized using high-speed CH* chemiluminescence imaging. Analysis of the high-speed images show changes in flame stabilization and dynamics during the onset and decay processes. The results of this study can have implications for systems that experience variations in fuel composition, particularly in light of growing interest in hydrogen as a renewable fuel.

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Section: Accepted Manuscript N O T C O P Y E D I T E Dsupporting

confidence: 52%

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Strollo

Peluso

O’Connor

2021

Journal of Engineering for Gas Turbines and Power

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“…Balasubramanian and Sujith 24 studied the combined effect of non‐normality and nonlinearity in combustion systems in triggering thermoacoustic instability mode in non‐premixed flames. The effect of burner geometry on thermoacoustic instability under different excitation frequencies has been studied by Zhou et al 105 Baraiya and Chakravarthy 106 studied thermoacoustic instability in three syngas compositions together with H 2 and H 2 /CH 4 mixtures in a non‐premixed combustor and reported different frequencies of instability with different mixtures and Reynolds numbers. Magri et al 107 showed that in regions of large heat release, hydrodynamics greatly impact the overall thermoacoustic stability.…”

Section: Thermoacoustic Instabilities In Oxyfuel Combustionmentioning

confidence: 99%

A review on combustion instabilities in energy generating devices utilizing oxyfuel combustion

Abubakar

Mokheimer

Kamal

2021

Intl J of Energy Research

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“…In this context, one of the alternatives is the use of synthesis gas (syngas), a product of biomass gasification. According to [2], syngas is mainly used due to its renewable condition and clean combustion, as opposed to burning coal, for example. This gas is primarily composed of hydrogen, carbon monoxide and nitrogen, with concentrations depending on the nature of its obtainment.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Soot Formation in Syngas Confined Flames on the Oec Using Lean Conditions and Acetylene Doping

Wilfinger¹,

Neves²,

Santos³

2021

Blucher Engineering Proceedings

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The combustion process will continue to be one of the main sources of energy for some time. However, this process causes environmental impacts with its use, which brings global problems such as the greenhouse effect and particulate emissions, such as soot. Therefore, studies are needed to make more sustainable and efficient combustion processes. With this in mind, the use of biomass gasification has been studied, resulting in a fuel known as syngas, composed largely of hydrogen and carbon monoxide, which, as it comes from biomass, has a reduced effect on emissions. Studies of combustion are also carried out in lean conditions that allow reduced emissions. In this context, the work aims to present the experimental study of the correlation between syngas use, the oxygen enhanced combustion (OEC) technique in lean conditions with acetylene doping, in a confined diffuse flame and its associated effects on soot formation. The laser light extinction technique was used to measure the concentration of soot. Soot concentration were evaluated in equivalence ratios of 0.7 and 1.0, 21 and 30% of volumetric oxygen content in the oxidant and acetylene doping of 5% (by volume). Analyzing the results in the condition of using OEC associated with lean conditions in syngas burning, it was noticed an increase in the soot concentration trend compared to the result without enrichment.

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Effect of syngas composition on high frequency combustion instability in a non-premixed turbulent combustor

Cited by 27 publications

References 46 publications

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

Effect of Hydrogen on Steady-State and Transient Combustion Instability Characteristics

A review on combustion instabilities in energy generating devices utilizing oxyfuel combustion

Evaluation of Soot Formation in Syngas Confined Flames on the Oec Using Lean Conditions and Acetylene Doping

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