Fundamental Simulation of Aluminum Droplet Combustion

Washburn, Ephraim B.; Gross, Matthew L.; Smith, Sean; Balachandar, S.

doi:10.2514/6.2010-6677

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Paul E. DesJardin et al [23] developed a model for the ignition combustion of aluminum particles in an air atmosphere, which models the ignition process and combustion process of aluminum particles separately and considers the transition from kinetically controlled surface reaction combustion in the ignition phase to diffusion-controlled evaporation combustion in the combustion phase as the combustion process proceeds. Ephraim B. Washburn [24] added the transition mecha-nism from diffusion control to chemical reaction kinetic control to the model and explored the effects of environmental parameters such as gas pressure, components, and ambient temperature on the combustion behavior of aluminum particles, and found that the combustion mechanism of aluminum particles changed to surface reaction kinetic-controlled combustion when the diameter of aluminum particles was less than 10 µm.…”

Section: Introductionmentioning

confidence: 99%

Study on the Transformation of Combustion Mechanism and Ejection Phenomenon of Aluminum Particles in Methane Flame

Xi¹,

Li²,

Ma³

et al. 2023

Energies

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In solid propellants, the combustion of aluminum particles often occurs in a hydrocarbon combustion atmosphere. In order to study the combustion energy release process of aluminum particles during propellant combustion, we carried out a study of the combustion behavior of aluminum particles in the combustion atmosphere of hydrocarbon fuels and conducted experiments using a plane flame burner to observe the combustion process of aluminum particles in a methane plane flame combustion atmosphere. High-speed microscopy revealed a new special combustion phenomenon: ejection combustion with the release of internal components from a point on the particle at high speed, in addition to the already observed particle microexplosions. Both phenomena show faster-than-normal combustion with short combustion energy release times. The experiments also showed that the combustion behavior of aluminum particles changes with the combustion environment. As the ambient effective oxidizer mole fraction increases from 13% to 29%, the basic combustion behavior of aluminum particles changes from vapor evaporation combustion to multiphase surface combustion. In addition, the percentage of aluminum particles burned by ejection increases from 18.2% to 49.2%, which becomes the dominant mechanism in the special combustion phenomenon of aluminum particles. This paper argues that the multiphase surface combustion provides higher heating rates due to the heat production collected on the particles and the diffusion combustion in the air around the aluminum particles, compared with the evaporation combustion. Therefore, the rate of temperature rise within the particle is affected by the ambient oxidant concentration, leading to a transformation from microexplosion to ejection combustion. The effect of the temperature of the combustion environment on this phenomenon has also been investigated through experiments conducted under different conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the Transformation of Combustion Mechanism and Ejection Phenomenon of Aluminum Particles in Methane Flame

Xi¹,

Li²,

Ma³

et al. 2023

Energies

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“…Due to this, numerical analysis can be a helpful complement for experimental studies, which allows the replication of complicated conditions and a better understanding of physical aspects. Several numerical approaches to evaluate the aluminum combustion [10][11][12], and slurry fuel droplets [13] were developed for comprehension of these subjects and also potentially helping metal combustion studies. Furthermore, numerical studies focused on aerodynamic aspects [14,15] and droplet combustion even in the absence of particles [16,17] are also relevant for the scientific community.…”

Section: Introductionmentioning

confidence: 99%

The Addition of Particles to an Alternative Jet Fuel

Ferrão

Mendes

Moita

et al. 2022

Fuels

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The expansion of the research on nanoscale particles demonstrates several advantages in terms of stability and an increased surface area to volume ratio compared to micron-sized particles. Based on this, the present work explores the addition of aluminum particles in hydrotreated vegetable oil (HVO), an alternative jet fuel. To evaluate the influence of particle sizes, nano and micron particles (40 nm and 5 μm) in a particle concentration of 0.5 wt.% were stably suspended in HVO. This study evaluates droplet combustion with an initial diameter of 250 μm in a drop tube furnace under different furnace temperatures (600, 800, 1000 °C). A high magnification lens coupled with a high-speed camera provides qualitative and quantitative data regarding droplet size evolution and micro-explosions. Pure HVO and Jet A-1 were also tested for comparison purposes. The results reveal that the addition of aluminum particles enhances the alternative jet fuel combustion. Furthermore, decreasing the particle size and increasing the furnace temperature enhances the burning rate compared to the pure HVO. Pure HVO presents a burning rate nearly to 1.75 mm2/s until t/D02 = 0.35 s/mm2 at T = 1000 °C. When nanoparticles are added to HVO in a particle concentration of 0.5 wt.%, an improvement of 24% in burning rate is noticed. Conventional jet fuel and pure HVO do not present any disruptive burning phenomena. However, when aluminum particles were added to HVO, micro-explosions were detected at the end of droplet lifetime, regardless of the particle size.

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Numerical simulation of luminous flame around ignited aluminum particle near burning surface of composite propellant with changing pressure

Takahashi¹,

Shimada²

2015

51st AIAA/SAE/ASEE Joint Propulsion Conference

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Fundamental Simulation of Aluminum Droplet Combustion

Cited by 3 publications

References 10 publications

Study on the Transformation of Combustion Mechanism and Ejection Phenomenon of Aluminum Particles in Methane Flame

Study on the Transformation of Combustion Mechanism and Ejection Phenomenon of Aluminum Particles in Methane Flame

The Addition of Particles to an Alternative Jet Fuel

Numerical simulation of luminous flame around ignited aluminum particle near burning surface of composite propellant with changing pressure

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