Fundamental spray characteristics of air-assisted injection system using aviation kerosene

Wu, Hao; Zhang, Fujun; Zhang, Zhenyu

doi:10.1016/j.fuel.2020.119420

Cited by 55 publications

(20 citation statements)

References 37 publications

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“…It can be found that the St of the tracer droplets does not exceed 0.1 for all GLR cases. Therefore, it can be confirmed that the tracking accuracy error of adopting droplets with diameter of 0-5 μm to characterize the local airflow velocity is less than 1% [13,14]. Moreover, this method also verifies the feasibility of using tiny droplets to characterize local air velocity, whereby the local airflow velocity can be calculated by…”

Section: Resultsmentioning

confidence: 72%

“…In addition, droplet size plays an important role in governing the two-phase flow and the dynamics of the droplets themselves. The distribution characteristics of droplet size can generally be defined as monodisperse and polydisperse [13]. A monodisperse distribution is one in which droplet sizes are mostly close to a single size level and such spray is usually described as quite uniform.…”

Section: Resultsmentioning

confidence: 99%

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Atomization and Droplet Dynamics Analysis of Air-assisted Spray under Different Gas-liquid Ratios

Zhang

Wei

et al. 2021

ICLASS

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The principal objective of the present work is to experimentally investigate the droplet behavior of air-assisted spray. Simultaneous measurements of droplet sizes and velocities were made by phase-Doppler particle analyzer with particular emphasis on droplet size distribution, gas-droplet interactions and droplet collision. The experimental results show that air-assisted spray is composed of bulk of tiny droplets entrained by high-speed air flow. The calculated Stokes numbers of selected tracer droplets with diameter less than 5 μm show that these droplets follow the air flow faithfully and thus can be used to estimate the local air flow velocity. The Reynolds number of local gas phase was found to be larger than the order of 10 4 . The analysis of the disintegration of discrete droplets indicates that the sampled droplets basically will not undergo shear breakup, but there is a possibility of turbulent breakup

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Atomization and Droplet Dynamics Analysis of Air-assisted Spray under Different Gas-liquid Ratios

Zhang

Wei

et al. 2021

ICLASS

Self Cite

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“…In previous works, most of scholars studied the air-assisted spray characteristics under low fuel injection pressures (below 0.8 MPa) due to the high atomization quality of the AAFI system under this pressure level [25,26]. They found that as the fuel injection pressure increases from 0.6 MPa to 0.8 MPa, the spray penetration and penetration growth rate both increase significantly.…”

Section: Comparative Studymentioning

confidence: 99%

“…Hu et al [23] compared the air-assisted spray characteristics of gasoline and kerosene under different test conditions to find considerable differences between the two in spray penetration, spray angle, droplet size, and velocity. Gao et al [24] and Wu et al [25] investigated the flash boiling phenomenon of air-assisted gasoline and kerosene spray, respectively. They found that a decrease in ambient pressure or an increase in fuel temperature may induce flash boiling of air-assisted spray, and the flash boiling greatly promotes atomization by increasing droplet spreading and reducing droplet size.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effects of Injection Parameters on the Air-Assisted Diesel Spray Characteristics

Zhao

2022

International Journal of Aerospace Engineering

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The air-assisted fuel injection (AAFI) system may be installed in the spark ignition aviation piston engine for the atomization of heavy fuels. However, studies on the effects of injection parameters on the spray characteristics are insufficient, which affects the improvement of AAFI engine performance. In this study, air-assisted diesel spray characteristics are investigated experimentally using a high-speed backlit imaging technique. The effects of main air-assisted injection control parameters such as fuel injection pressure, fuel temperature, and fuel injection duration on the spray characteristics are examined. The results show that spray shape changes from “spindle” to “cone” with an increase in fuel injection pressure. As the fuel injection pressure increases to 1.0 MPa, both the spray penetration and spray width increase significantly. “Protrusions” appear on the spray edge at high fuel temperatures. When the fuel temperature drops to 268 K, the spray penetration and spray width increase slightly. The spray shrinks significantly in both the axial and radial directions with an increase in fuel injection duration. Key parameters that directly affect air-assisted spray characteristics include the difference between the fuel-air mixture injection pressure and the ambient pressure, the density of fuel-air mixture in the air-assisted injector premixed chamber, and the kinetic energy density of the fuel. The former two parameters affect the spray penetration while the latter affects the spray width. The study is beneficial for the design of AAFI engines.

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“…The topic has been a widely studied problem, also thanks to a large number of other industrial applications. Knowledge of the laws of liquid jet behavior is important for spraying substances in the preparation of the coatings [ 9 ], for inkjet printers [ 10 , 11 ], diesel injection equipment [ 12 ], for fuel injection into rocket engines [ 13 ], to produce nonwovens, and other applications [ 14 , 15 ]. Due to the large number of possible applications, the parameters of the liquid jet (flow rate, nature of the flow—laminar, transient, turbulent, etc.)…”

Section: Introductionmentioning

confidence: 99%

A Short Note about the Impact Action of a Water Jet Stabilized by a Coaxial Air Stream in the Air and Underwater

2021

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A new original method, applying a coaxial protective airflow, was tested aiming to improve the pure water jet efficiency in surface layer removal or medium hard materials cutting or blasting. The dual action of the air flow is expected: the air co-flowing the water jet with approximately the same velocity should prevent the central jet from breaking up into tiny droplets in the near field, and simultaneously, it should support jet decomposition into big parts with enough destructive potential in the far-field. A brief survey of the relevant literature dealing with the water jet instability is presented, introducing four recognized breakup regimes. An original cutting head designed to generate a waterjet surrounded by protective coaxial air flow is introduced. The submitted device is supposed to operate within the first wind-induced regime. Two types of experiments, consisting of blasting limestone bricks placed either in the air or underwater, were realized. The depths of kerfs produced with different water pressures and air overpressures were evaluated. While no substantial positive effect was recognized in the air performance, the submerged blasting of the same material under similar conditions appeared to be promising.

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Fundamental spray characteristics of air-assisted injection system using aviation kerosene

Cited by 55 publications

References 37 publications

Atomization and Droplet Dynamics Analysis of Air-assisted Spray under Different Gas-liquid Ratios

Atomization and Droplet Dynamics Analysis of Air-assisted Spray under Different Gas-liquid Ratios

Experimental Investigation on the Effects of Injection Parameters on the Air-Assisted Diesel Spray Characteristics

A Short Note about the Impact Action of a Water Jet Stabilized by a Coaxial Air Stream in the Air and Underwater

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