The influence of fuel properties on drop-size distribution and combustion in an oil spray

Rosa, Augusto; Sobiesiak, Andrzej; Brzustowski, T.A.

doi:10.1016/s0082-0784(88)80285-6

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Single droplet combustion might be more likely to occur at the edges of the flame where droplet momentum carries individual droplets into oxygen-rich regions. De La Rosa et al (1986) analyzed dropsize distributions in a non-burning spray for an air-blast atomizer using a Laser diffraction particle analyzer. Two oil fuels, No.…”

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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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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“…Rosa et al [5] studied experimentally the effect of oil fuel properties on droplet size distribution and spray combustion. Two oil fuels are atomized and burn at different temperatures, subsequently different viscosities.…”

Section: /17mentioning

confidence: 99%

Experimental Investigation on the Spray Combustion Produced by an External Mixing Air Assist Atomizer

Khodir

Asar

El-Behery

et al. 2017

International Conference on Aerospace Sciences and Aviation Tec

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The combustion of spray of liquid fuels has a significant importance in the industry field. This paper describes an experimental study to understand and analyze the flame structure of a light diesel fuel. A special design of an external mixing air assist atomizer is used for the atomization. The atomizer installed through burner tube. Combustion tests in a small scale laboratory furnace are carried out to select the optimum operating conditions for good combustion and low emissions. The emissions (CO and NOx), combustion efficiency, axial and radial inflame temperature profiles and the heat transfer distribution for the water jacket are measured at various operating conditions. Visual observation of free jet flames was taken over wide ranges of atomizing air pressure. It is found that increasing the atomizing air pressure with the same air to fuel ratio, leads to decreasing the amount of heat flux to the cooling water jacket, decreasing in the combustion efficiency and increasing in CO and NOx emissions. It is noticed that increasing in air to fuel ratio (A/F) at the same fuel flow rate leads to decreasing in CO and NOx emissions.

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“…Single droplet combustion might be more likely to occur at the edges of the flame where droplet momentum carries individual droplets into oxygen-rich regions. De La Rosa et al (1986) analyzed dropsize distributions in a non-burning spray from an air-blast atomizer using a Laser diffraction particle analyzer. Two oil fuels, No.2 and No.6, were used with the same atomization parameters.…”

Section: Introductionmentioning

confidence: 99%

Structure of a Hollow-Cone Spray With and Without Combustion

Chehroudi

Ghaffarpour

1992

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

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A hollow-cone spray with a nominal cone angle of 30 degrees from a pressure-swirl fuel atomizer was used in a swirl-stabilized combustor. The combustor is circular in cross section, with a swirl plate and fuel nozzle axis coinciding with the axes of the chamber. kerosene is injected upward inside the chamber from the fuel nozzle. Separate swirl and dilution air flows are distributed into the chamber that pass through honeycomb flow straighteners and screens. A 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. A Phase Doppler Particle Analyzer (PDPA) is used to measure drop size, mean and rms values of axial drop velocity, fuel volume flux, drop velocity and size distributions, and size-classified drop velocity profiles for two cases of with and without combustion and 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, with slight increase in the magnitudes of the peak drop velocities due to combustion. Root mean square (RMS) values of drop velocity fluctuations decrease due to a 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. Fuel volume flux profiles indicate negligible drop vaporization and/or burning up to a distance of 25mm from the nozzle. Velocity number distributions at different radial points for without combustion at an axial distance of 55mm from the atomizer are symmetric in shape only close to the peak of the mean drop velocity and show a bimodal shape around the maximum mean drop axial velocity gradient. Corresponding number distributions for the combustion case are fairly symmetric and quite different in behavior at all radial positions. Size-classified drop velocity profiles are also plotted and discussed.

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The influence of fuel properties on drop-size distribution and combustion in an oil spray

Cited by 4 publications

References 7 publications

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

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

Experimental Investigation on the Spray Combustion Produced by an External Mixing Air Assist Atomizer

Structure of a Hollow-Cone Spray With and Without Combustion

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