An experimental comparison of the elliptical and circular nozzles spray and mixing characteristics under different injection pressures

Yu, Shengwei; Yin, Bifeng; Deng, Wang-Qiu; Jia, Huang; Ye, Ze; Xu, Bin; Xu, Huacheng

doi:10.1016/j.fuel.2018.09.118

Cited by 21 publications

(8 citation statements)

References 23 publications

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“…Additionally, very early injection times, the elliptical spray liquid-phase penetration was longer than the circular one. However, for quasi-stationary injection, the important finding is that the elliptical spray liquid-phase penetration is shorter than the circular one, indicating that the application of the elliptical hole nozzle is helpful for speeding up liquid core fragmentation due to the instability deformation of the asymmetric elliptical jet and the axis-switching phenomenon, as well as the axis-switching behaviors that were found in our previous work [10]. In order to analyze the influence of the injection parameters on the length of the stable spray liquid phase, Figure 5 shows the method used to obtain the stabilized value of the spray liquid-phase penetration.…”

Section: The Effects Of Injection Pressure On the Spray Liquid-phase ...mentioning

confidence: 63%

“…The optical configuration setup is shown in Figure 2a, including a camera connected with a spike filter and a Nd: YAG laser for the visualization of the spray liquid-phase. More details of the Nd: YAG laser system and spray image capture system can be found in previously published works [10,26]. The high bulk temperature is achieved by setting electrical resistors inside the bottom of the chamber, as shown in Figure 2b.…”

Section: Experimental Visualization Workmentioning

confidence: 99%

“…Yu et al [8][9][10] compared the spray characteristics of a diesel injector with circular and elliptical cross-section shapes under room temperature, the results showed that using an elliptical nozzle reduced the spray tip penetration, and the elliptical spray cone angle and the projection area were both higher than the circular spray, indicating that the application of the elliptical hole nozzle could greatly increase the air-fuel mixture quality. Ku et al [11] presented a study of the macro spray characteristics by using an elliptical hole injector and a conventional circular nozzle under non-evaporative conditions.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

Yin

Jia

et al. 2020

Energies

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Elliptical diesel nozzles affect the fuel–air mixing process, and thus combustion and exhaust emissions. Experiments were conducted to study biodiesel spray liquid-phase behaviors for elliptical and circular nozzles through the Mie-scattering method under evaporative conditions. Based on the measurements, the results show that the elliptical nozzle spray liquid-phase penetration is smaller than the circular one under steady-state conditions. The deformation and the axis-switching behaviors of the elliptical jet are helpful in accelerating the breakup of the liquid core. Moreover, the injection pressure has little impact on the penetration of the liquid-phase spray for either geometrical orifice. Additionally, increasing the ambient temperature can reduce the penetration of liquid-phase spray, because an increase in temperature increases the rate of evaporation. The differences in steady liquid-phase penetration between circular and elliptical sprays decrease as the ambient temperature increases. Additionally, increasing the backpressure can decrease the liquid-phase penetration. The differences in steady liquid-phase penetration between circular and elliptical nozzles are reduced with the increase in backpressure, probably due to the axis-switching and deformation behaviors of the elliptical jet being restrained under high-backpressure conditions. Finally, the application of an elliptical orifice is beneficial for decreasing the spray liquid-phase penetration, and thus avoiding the fuel impingement in small engine combustion chambers. The lower liquid-phase penetration for elliptical spray indicated higher fuel and air mixture quality, which is helpful for reducing the diesel engine exhaust soot emissions.

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Section: The Effects Of Injection Pressure On the Spray Liquid-phase ...mentioning

confidence: 63%

Section: Experimental Visualization Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

Yin

Jia

et al. 2020

Energies

Self Cite

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“…To improve the combustion efficiency of diesel engines, many researchers used elliptical nozzles to enhance spray characteristics and mixing quality. Yu [13] proved that the elliptical spray exhibited larger spray areas than the circular spray, which suggested that using an elliptical orifice was helpful to increase the mixture quality of fuel and air. Molina [14] has done some work about the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bubble Acoustic Characteristics of Elliptical Nozzles

Cong

Liu

2021

E3S Web Conf.

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Bubble acoustic signals were reported experimentally using five different nozzles with the same exit cross-sections. The bubble morphology was captured by a home-made experiment setup, which could synchronously obtain images of two perpendicular directions. Short-Time Fourier Transform and synchronization of video and audio were adopted to analyse the acoustic signal. Results demonstrated that the sound pressure of symmetrical bubble formation was higher than that of asymmetrical bubble formation, while the sound pressure of asymmetrical bubble formation was higher than that of the bubble with an unapparent necking fracture detached from the nozzle of the aspect ratio is 4:1. Furthermore, the last bubble of bubble chains would change the shape and decay rate of the acoustic signal due to the difference in the period of bubble formation. These studies can provide more effective information to predict the leaks from undersea gas pipelines, seabed methane reserves, and carbon capture and storage facilities.

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“…The influence of the nozzle holes geometry on spray penetration, spray cone angle, and spray volume was experimentally investigated [11][12][13]. The effect of the cross-section shape of nozzle orifice including round, elliptical, and triangular on the cone angle and fuel spray length was studied at injection pressures from 50 to 160 MPa, the pressure in a constant volume chamber of 1.0-3.0 MPa, and nitrogen gas temperature of 300 K [14][15][16][17]. High-speed video filming was carried out in two planes.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

et al. 2019

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Comparative experimental studies of fuel sprays evolution dynamics in a constant volume chamber were carried out with a view to reduce the uneven distribution of diesel fuel in the combustion chamber when the Common Rail injector is inclined. The fuel sprays was captured by a high-speed camera with simultaneous recording of control pulses of camera and injector on an oscilloscope. Two eight-hole diesel injectors were investigated: One injector with identical orifice diameter (nozzle 1) and another injector with four orifices of the same diameter as orifices of nozzle 1 and four orifices of enlarged diameters (nozzle 2). Both injectors were tested at rail pressure from 100 to 165 MPa and injector control pulse width of 1.5 ms. The dynamics of changes in the spray penetration length and spray cone angle were determined. It was found that sprays develop differently in nozzle 1 fuel. The difference in the length of fuel sprays is 10–15 mm. As for nozzle 2, the fuel sprays develop more evenly: The difference in length is no more than 3–5 mm. The difference of the measured fuel spray cone angles for nozzle 1 is 0.5°–1.5°, and for nozzle 2 is 3.0°–4.0°. It is concluded that the differential increase in the diameters of nozzle orifices, the axes of which are maximally deviated from the injector axis, makes it possible to reduce the uneven distribution of fuel in the combustion chamber and improve the combustion process and the diesel performance as a whole.

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An experimental comparison of the elliptical and circular nozzles spray and mixing characteristics under different injection pressures

Cited by 21 publications

References 23 publications

The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions

Experimental Study on Bubble Acoustic Characteristics of Elliptical Nozzles

Experimental Studies of Fuel Injection in a Diesel Engine with an Inclined Injector

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