Further experiments on the structure of a spray combustion flame

Onuma, Yoshiaki; Ogasawara, Masashi; Inoue, Toshihiko

doi:10.1016/s0082-0784(77)80352-4

Cited by 25 publications

(7 citation statements)

References 1 publication

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“…This implies that the droplets do not burn individually but that fuel vapor from the droplet concentrates and burns like a gas diffusion flame. Such behaviour has indeed been observed in heavy fuel sprays (Onuma et al, 1976).…”

Section: Gas Phase Heat and Mass Transfersupporting

confidence: 58%

A Mathematical Model for Heavy Fuel Droplet Vaporization and Pyrolysis in a High Temperature Inert Gas

Baert

1993

Combustion Science and Technology

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Section: Gas Phase Heat and Mass Transfersupporting

confidence: 58%

A Mathematical Model for Heavy Fuel Droplet Vaporization and Pyrolysis in a High Temperature Inert Gas

Baert

1993

Combustion Science and Technology

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“…This conclusion was also backed by similarities observed on the results obtained when propane (gaseous fuel) and kerosene were separately used through the same fuel nozzle. In a follow-up work Onuma et al(1977) used the same set-up and measured NO distribution in heavy oil and kerosene. Based on similar behavior in two flames they supported their earlier conclusions.…”

Section: Introductionmentioning

confidence: 99%

Spray Drop Size and Velocity Measurements in a Swirl-Stabilized Combustor

Chehroudi

Ghaffarpour

1991

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

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A pressure-swirl fuel nozzle generating a hollow-cone spray with nominal cone angle of 30 degrees is used in a swirl-stabilized combustor. The combustor is circular in cross section with swirl plate and fuel nozzle axes aligned and coinciding with the axis of the chamber. Kerosene is injected upward inside the chamber from the fuel nozzle. Separate swirl and dilution air flows are uniformly distributed into the chamber that pass through the honey comb flow straighteners and screens. Calculated swirl number of 1.5 is generated with the design swirl plate exit air velocity of 30 degrees with respect to the chamber axis. Effects of swirl and dilution air flow rates on the shape and stability of the flame are investigated. Stable and classical liquid fuel sheet disintegration zone exists close to the nozzle with no visible light followed by a luminous blue region and a mixed blue/yellow region that subsequently turns into yellow for most of the part in the flame. A Phase Doppler Particle Analyzer (PDPA) is used to measure drop size, mean and rms axial velocity for two cases of with and without combustion at six different axial locations from the nozzle. For the no-combustion case all air and fuel flow rates were kept at the same values as the combusting spray condition. Results for mean axial drop velocity profiles indicate widening of the spray due to combustion while the magnitudes of the peak velocities are slightly increased. No measurements inside the hollow-cone spray are possible due to burning of fuel droplets. Drop turbulence decreases due to combination of increase in gas kinematic viscosity and elimination of small drops at high temperatures. Sauter Mean Diameter (SMD) radial profiles at all axial locations increase with combustion due to preferential burning of small drops.

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“…This is attributed to the fact that the droplets vaporize rapidly in fuel-rich regions before reaching the flame front. Further studies performed between kerosene and heavy fuel oil, yielded very similar findings, suggesting that this behavior is not strongly dependent upon fuel volatility [14].…”

Section: Spray Flamesmentioning

confidence: 62%

“…Experimental evidence that external combustion occurs in spray flames is apparent in work carried out by Onuma and Ogasawara et-al. [13,14]. Combustion studies performed in a nonpremixed turbulent flame with propane and kerosene showed that almost no difference existed between the flame structure and species concentration profiles between the two fuels [13].…”

Section: Spray Flamesmentioning

confidence: 99%

Pyrolysis oil combustion characteristics and exhaust emissions in a swirl-stabilized flame

Wissmiller¹

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Further experiments on the structure of a spray combustion flame

Cited by 25 publications

References 1 publication

A Mathematical Model for Heavy Fuel Droplet Vaporization and Pyrolysis in a High Temperature Inert Gas

A Mathematical Model for Heavy Fuel Droplet Vaporization and Pyrolysis in a High Temperature Inert Gas

Spray Drop Size and Velocity Measurements in a Swirl-Stabilized Combustor

Pyrolysis oil combustion characteristics and exhaust emissions in a swirl-stabilized flame

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