Soot formation, spray characteristics, and structure of jet spray flames under high pressure

Nakamura, Mariko; Nishioka, Daichi; Hayashi, Jun; Akamatsu, Fumiteru

doi:10.1016/j.combustflame.2010.12.033

Cited by 25 publications

(9 citation statements)

References 18 publications

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“…Despite challenging conditions, laser diagnostic techniques have been used to study high pressure kerosene combustion [30][31][32]. Since preheat and dilution have been shown to alter the heat release characteristics [2,3,6,12], it is essential to investigate the effect of hot product dilution on heat release rate profiles and therefore explore possibilities of experimental markers used to map them.…”

Section: Introductionmentioning

confidence: 99%

Simulations of laminar non-premixed flames of kerosene with hot combustion products as oxidiser

Sidey

Giusti

Mastorakos

2016

Combustion Theory and Modelling

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The effects of hot combustion product dilution in a pressurised kerosene-burning system at gas turbine conditions were investigated with laminar counterflow flame simulations. Hot combustion products from a lean (φ = 0.6) premixed flame were used as an oxidiser with kerosene surrogate as fuel in a non-premixed counterflow flame at 5, 7, 9 and 11 bar. Kerosene-hot product flames, referred to as 'MILD', exhibit a flame structure similar to that of kerosene-air flames, referred to as 'conventional', at low strain rates. The Heat Release Rate (HRR) of both conventional and MILD flames reflects the pyrolysis of the primary and intermediate fuels on the rich side of the reaction zone. Positive HRR and OH regions in mixture fraction space are of similar width to conventional kerosene flames, suggesting that MILD flames are thin fronts. MILD flames do not exhibit typical extinction behaviour, but gradually transition to a mixing solution at very high rates of strain (above A = 160, 000 s −1 for all pressures). This is in agreement with literature that suggests heavily preheated and diluted flames have a monotonic S-shaped curve. Despite these differences in comparison with kerosene-air flames, MILD flames follow typical trends as a function of both strain and pressure. Further still, the peak locations of the overlap of OH and CH 2 O mass fractions in comparison with the peak HRR indicate that the pixel-by-pixel product of OH-and CH 2 O-PLIF signals is a valid experimental marker for non-premixed kerosene MILD and conventional flames.

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Section: Introductionmentioning

confidence: 99%

Simulations of laminar non-premixed flames of kerosene with hot combustion products as oxidiser

Sidey

Giusti

Mastorakos

2016

Combustion Theory and Modelling

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“…However, the mechanism of spray combustion has not been fully understood yet. In particular, the effects of ambient pressure on the spray combustion behavior have not been well clarified yet mainly because the combustion conditions and the acquired properties are extremely limited due to the difficulty of the measurements (e.g., [23][24][25]).…”

Section: Introductionmentioning

confidence: 99%

Effects of ambient pressure, gas temperature and combustion reaction on droplet evaporation

Kitano

Nishio

Kurose

et al. 2014

Combustion and Flame

119

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The effects of ambient pressure, initial gas temperature and combustion reaction on the evaporation of a single fuel droplet and multiple fuel droplets are investigated by means of three-dimensional numerical simulation. The ambient pressure, initial gas temperature and droplets' mass loading ratio, M L, are varied in the ranges of 0.1-2.0 MPa, 1000-2000 K and 0.027-0.36, respectively, under the condition with or without combustion reaction. The results show that both for the conditions with and without combustion reac

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“…However, since spray combustion is a complex phenomenon in which the dispersion of liquid fuel droplets, their evaporation, and the chemical reaction of the fuel vapor with the oxidizer take place interactively at the same time, the underlying physics governing these processes has not been well understood. In particular, effect of ambient pressure on the spray combustion behavior has not been well clarified yet mainly because combustion conditions and acquired properties are extremely limited due to the difficulty of the measurements [1,2,3,4].…”

Section: Introductionmentioning

confidence: 99%

1101 Effect of ambient pressure on spray jet flame structure

Kitano¹,

Takafumi²,

Kurose³

et al. 2013

ICJWSF

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Effect of ambient pressure on spray jet flame behavior is studied. Three-dimensional large-eddy simulation (LES) is applied to spray jet flames at ambient pressures of 0.1, 0.5 and 1.0 MPa. Jet-A is used as liquid fuel, and the evaporating droplets' motions are tracked by a Lagrangian method. As turbulent combustion model, a flamelet/progress-variable approach which considers 274 chemical species and 1537 elementary reactions is used. The results show that as the ambient pressure increases, increase in gas temperature and evaporation of droplets become remarkable in the upstream region.

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Soot formation, spray characteristics, and structure of jet spray flames under high pressure

Cited by 25 publications

References 18 publications

Simulations of laminar non-premixed flames of kerosene with hot combustion products as oxidiser

Simulations of laminar non-premixed flames of kerosene with hot combustion products as oxidiser

Effects of ambient pressure, gas temperature and combustion reaction on droplet evaporation

1101 Effect of ambient pressure on spray jet flame structure

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