On the role of vortex-ring formation in influencing air-assisted spray characteristics of n-heptane

Wu, Hao; Zhang, Fujun; Zhang, Zhenyu; Guo, Zhibo; Zhang, Weizheng; Gao, Hongli

doi:10.1016/j.fuel.2020.117044

Cited by 27 publications

(6 citation statements)

References 66 publications

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“…In addition, discussions on the penetration and width of air-assisted spray in previous works are insufficient. Researchers generally believed that the difference between the mixture injection pressure and the ambient pressure is the main parameter that affects the spray penetration [27], and the air/fuel ratio affects the spray width [22]. In this work, after analyzing the experimental results of different test conditions, three key parameters that directly affect the penetration and width of air-assisted spray were determined, which helps people understand the atomization mechanism of AAFI systems.…”

Section: Comparative Studymentioning

confidence: 99%

“…Jin et al [21] found that the ambient gas density significantly influences the penetration and overall SMD of the air-assisted spray; the vortex ring shed from the injector outlet implies a strong coupling between the gas and liquid phases. Subsequently, Wu et al [22] studied the formation of vortex ring and its influences on air-assisted spray characteristics.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Comparative Studymentioning

confidence: 99%

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 operating principle of the air-assisted injection system as well as fluid supply method has been described in sufficient detail in our previous publications [40,41]. A brief summary of air-assisted injector is outlined here for completeness.…”

Section: Experimental Setup and Test Conditionsmentioning

confidence: 99%

On the evolution of n-octane atomization characteristics using an air-assisted intermittent spray method

Zhang

et al. 2022

Fuel Processing Technology

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“…In the meantime, intake pipe's resonance effect and continuous switching of the gas nozzle will strengthen the pressure oscillation which affects the precise amount of fuel injection and the atomization performance. 8,9 To maintain the relatively stable pressure, orifice plates are introduced to the AAFI. 10 Although orifice plates possess excellent pressure stabilizing performance, the relevance between the design of the orifice plates and the pressure stabilizing performance has yet to be researched thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of orifice plates in the air-assisted kerosene injection system applied in the wankel rotary engine

Cao

Liu

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Pressure stabilizing performance of orifice plates is analyzed by the method of simulation. To guarantee the high efficiency of analysis, an orthogonal table designation L9(34) is established. Range analysis is performed by using the method of orthogonal design. In the meantime, the results show that the number of horizontal plates is the main influence factor of pressure stabilizing performance. By analyzing flow characteristics, internal flow performance of pressure stabilizing cavity is demonstrated. Simultaneously, the mechanism of optimal pressure stabilizing performance is illustrated from both global and local perspectives. Increasing the number of horizontal plates reduces flow area of the cavity and brings extra throttling loss, thus improving the performance of pressure stabilizing. The final design of orifice plates can accurately control the amount of fuel injection which in turn guarantee the reliability of the air-assisted injection system.

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On the role of vortex-ring formation in influencing air-assisted spray characteristics of n-heptane

Cited by 27 publications

References 66 publications

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

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

On the evolution of n-octane atomization characteristics using an air-assisted intermittent spray method

Design and optimization of orifice plates in the air-assisted kerosene injection system applied in the wankel rotary engine

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