Numerical study on the effect of the injection pressure on spray penetration length

Shervani-Tabar, Mohammad T.; Sheykhvazayefi, Meysam; Ghorbani, Morteza

doi:10.1016/j.apm.2013.03.002

Cited by 38 publications

(13 citation statements)

References 14 publications

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“…Moreover, the results showed that nozzles with small length-diameter ratios had a higher tendency to cavitate with a greater discharge coefficient. Numerical simulations have also been performed to determine the effect of the injection pressure in the injector on the spray penetration length [19]. The results presented in [19] showed that an injection pressure >120 MPa causes hydraulic flip and an increased injection pressure reduces the Sauter mean diameter (SMD).…”

Section: Introductionmentioning

confidence: 98%

“…Numerical simulations have also been performed to determine the effect of the injection pressure in the injector on the spray penetration length [19]. The results presented in [19] showed that an injection pressure >120 MPa causes hydraulic flip and an increased injection pressure reduces the Sauter mean diameter (SMD). Variation in the nozzle angle due to the injector body has been investigated in terms of cavitation, where the results suggested that the amount of injector fuel is reduced considerably when the angle is closer to the injector body axis [20,21].…”

Section: Introductionmentioning

confidence: 98%

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Numerical study of the effects of injector needle movement and the nozzle inclination angle on the internal fluid flow and spray structure of a group-hole nozzle layout

Taghavifar

Shervani-Tabar

Abbasalizadeh

2015

Applied Mathematical Modelling

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a b s t r a c tIn this study, we explored the spray behavior as a result of microscopic variations in the flow characteristics when the nozzle hole inclination angle was varied and the needle reciprocated. The volume fraction and viscosity contours were investigated at three needle modes of 0.01, 0.25, and 0.24 mm using three nozzle inclination angles of 10°, 15°, and 30°. We determined the relationship between the two key parameters of liquid viscosity (which developed in the sac-volume and nozzles) and volume vapor fraction in the injector with the spray characteristics and the equivalence ratio by considering different needle positions and inter-nozzle angles as objective variables. It was found that a lower included angle led to higher viscosity development in nozzles with low cavitation formation, whereas increasing the inclination angle increased the viscosity amplitude in the sac-volume section and decreased the viscosity in the nozzles, as well as yielding more cavitation formation along the nozzles. The lowest viscosity was obtained with an inclination angle of 15°, which may facilitate the primary breakup process during spray atomization. The highest spray dispersion was achieved with a nozzle angle of 15°, which was due mostly to higher cavitation and a lower spatial viscosity distribution. Comparisons of the model and experimental data demonstrated the validity of the predicted spray structures based on simulations in terms of penetration and the droplet diameter.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Numerical study of the effects of injector needle movement and the nozzle inclination angle on the internal fluid flow and spray structure of a group-hole nozzle layout

Taghavifar

Shervani-Tabar

Abbasalizadeh

2015

Applied Mathematical Modelling

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“…The atomization and fuel spray characteristics play a vital part in direct injection diesel engines especially for gas emissions and combustion efficiency [1]. In recent years, the fuel injection system shows development toward high injection pressure with a small hole injector in order to follow the requirements of Europe 6 and the regulations of low emissions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Nozzle Flow and Spray Characteristics from Different Nozzles Using Diesel and Biofuel Blends

et al. 2019

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In this paper, the discrete phase model (DPM) was introduced to study the fuel injector cavitations process and the macro spray characteristic of three different types of nozzle spray shape with diesel and hybrid biofuel blend for several injection pressures and backpressures. The three types of nozzle spray shapes used were circle, elliptical A type, and elliptical B type. The cavitations’ flows inside the injector nozzles were simulated with Computer Fluid Dynamics (CFD) simulations using the cavitations mixture approach. The effect of nozzle spray shape towards the spray characteristic of hybrid biofuel blends is analyzed and compared with the standard diesel. Furthermore, a verification and validation from both the experimental results and numerical results are also presented. The nozzle flow simulation results indicated that the fuel type did not affect the cavitation area vastly, but were more dependent on the nozzle spray shape. In addition, the spray width of the elliptical nozzle shape was higher as compared to the circular spray. Moreover, as the backpressure increased, the spray width downstream increased as well. The spray tip penetration for the elliptical nozzle shape was shorter than the circular nozzle shape due to circular nozzles having smaller nozzle widths and lesser spray cone angles. Thus, this resulted in smaller aerodynamic drag.

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“…Wang et al [8] established a spray model coupled with nozzle cavitating flow to discover the influence of diesel nozzle geometric parameters including the ratio of nozzle hole length to diameter, entrance curvature radius of nozzle hole and sac volume structure on spray characteristics, which were significant parameters for the structure optimization of the fuel system. Shervani-Tabar et al [9] studied the influences of injection pressure on the atomizing performances like the spray penetration, the Sauter mean diameter (SMD) and the evaporation of the fuel via numerical simulation. He pointed out the spray penetration and the spray atomization quality would improve with the increase in injection pressure, though SMD would decrease.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective parameters optimization design of self-excited oscillation pulsed atomizing nozzle

Wang

Sun

Chen

2019

J Braz. Soc. Mech. Sci. Eng.

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The self-excited oscillation pulsed atomizing nozzle can effectively and evenly spray the high-speed solid cone jet without any extra power. The primary atomization of the jet at the outlet of nozzle directly affects the final spray quality, and the turbulence and cavitation at the outlet of the atomizing nozzle are the other two main factors affecting the atomization. In this work, multi-objective optimization depending on nozzle parameters was established by using mathematical optimization techniques and computational fluid dynamics to improve the jet atomization quality at the outlet of the nozzle. The central composite design method and the response surface method were used to obtain the approximate mathematical model of the primary atomization quality of the jet at the outlet of nozzle. Finally, the non-dominated sorting genetic algorithm with elitist strategy (NSGA-II) and the grey theory were used in combination to optimize the nozzle parameters. Through combining with the NSGA-II and the grey theory, the nozzle parameters were optimized in order to obtain the best primary atomization at the outlet area of nozzle. The optimization results verified the nozzle design with multi-objective optimization method. The optimized values of the turbulent kinetic energy F 1 and the vapor volume fraction F 2 increased by 28.26% and 5.56%, respectively, and the corresponding nozzle parameters of the chamber diameter D, the lower nozzle diameter d 2 and the upper nozzle inlet pressure P in were, respectively, optimized to 28.056 mm, 5.472 mm and 3.999 Mpa.

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Numerical study on the effect of the injection pressure on spray penetration length

Cited by 38 publications

References 14 publications

Numerical study of the effects of injector needle movement and the nozzle inclination angle on the internal fluid flow and spray structure of a group-hole nozzle layout

Numerical study of the effects of injector needle movement and the nozzle inclination angle on the internal fluid flow and spray structure of a group-hole nozzle layout

Numerical Analysis of Nozzle Flow and Spray Characteristics from Different Nozzles Using Diesel and Biofuel Blends

Multi-objective parameters optimization design of self-excited oscillation pulsed atomizing nozzle

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