Numerical investigation on the spray characteristics of biodiesel with gas-assisted atomization injection

Liu, Rui; Zhong, Lingfeng; Li, Songhong; Li, Jing; Ji, Haocheng

doi:10.1016/j.fuel.2023.130178

Fuel

2024

DOI: 10.1016/j.fuel.2023.130178

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Numerical investigation on the spray characteristics of biodiesel with gas-assisted atomization injection

Rui Liu,

Lingfeng Zhong,

Songhong Li

et al.

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2024

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Cited by 2 publications

References 49 publications

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Breakup characteristics of a pulse jet issuing into a compressed gas environment under different injection conditions

Xie,

Lei,

Deng

et al. 2024

Physics of Fluids

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The dynamics of jet breakup undergo significant alteration due to the influence of a compressed gas environment. In the first injection stage of an air-assisted fuel injector (AAFI), fuel is introduced into such an environment. Therefore, studying the influence of injection conditions on the jet breakup characteristics has significant importance for AAFI spray. This study utilized a high-speed camera to record the jet breakup images in a compressed gas environment. Subsequently, these images were analyzed using MATLAB to get the spray penetration distance and fuel projection area (FPA). The research findings indicate that both fuel injection pressure (FIP) and fuel–gas pressure drop (ΔP) exert influence on jet breakup characteristics, with ΔP exhibiting more significant influence. Maintaining ΔP at 1 bar, when FIP increased from 4 to 7 bar, gas Weber number (Weg) increased by 87%. While maintaining gas pressure at 5 bar, as ΔP increased from 1 to 3 bar, Weg escalated by 194%. Additionally, jet breakup length under different injection conditions followed a pattern as summarized by Bonhoeffer et al. [“Impact of formulation properties and process parameters on the dispensing and depositioning of drug nanosuspensions using micro-valve technology,” J. Pharm. Sci. 106(4), 1102–1110 (2017)]. The jet surface disturbance was enhanced by the increase in both FIP and ΔP. The detachment of the droplets from main jet stream induced by ΔP resulted in an increase in jet flow width. Furthermore, the effect of ΔP on FPA was more significant compared to FIP. As ΔP rose from 1 to 3 bar, the time-averaged FPA and area-to-mass ratio (Raq) increased 245% and 207%, respectively.

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Breakup characteristics of a pulse jet issuing into a compressed gas environment under different injection conditions

Xie,

Lei,

Deng

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

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Droplet dynamics and spray mechanism of air-assisted intermittent atomization under different injection timings

Hui,

Wu,

Zhang

2024

Physics of Fluids

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The droplet dynamics and spray mechanism of air-assisted intermittent atomization were experimentally investigated, with a particular focus on the effect of injection timing (duration of fuel injection ranged from 1 to 10 ms, and the interval between fuel injection and air injection varied from −0.5 to 2 ms) on jet atomization. Droplet velocities, sizes, and arrival times at a selected location were obtained by applying a phase Doppler particle analyzer (PDPA) with the combination of high-speed photography for spray visualization. The results indicate that droplet dynamics and velocity distribution are substantially influenced by fuel injection duration. Specifically, two peaks in the droplet velocity distribution are identified when the fuel injection duration exceeded 6 ms. Reconstruction of the gas-phase velocity using tracer particles reveals that the gas-phase velocity and stability are similarly affected by the fuel injection duration, and the gas flow tends to be stable for fuel injection durations longer than 6 ms. Droplets in the two velocity peaks exhibit different dynamic characteristics. The phenomenon of two peaks in droplet velocity is attributed to fuel accumulation inside the air-assisted atomizer, with the analysis given in terms of spray concentration and fuel state in the atomizer. Fuel accumulation and twin-peak droplet velocity caused by extended fuel–air injection intervals are predicted and validated.

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Numerical investigation on the spray characteristics of biodiesel with gas-assisted atomization injection

Cited by 2 publications

References 49 publications

Breakup characteristics of a pulse jet issuing into a compressed gas environment under different injection conditions

Breakup characteristics of a pulse jet issuing into a compressed gas environment under different injection conditions

Droplet dynamics and spray mechanism of air-assisted intermittent atomization under different injection timings

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