Effect of Lube Oil Film Thickness on Spray/Wall Impingement with Diesel, M20 and E20 Fuels

Ge, Ming; Liang, Xingyu; Yu, Hanzhengnan; Wang, Yuesen; Zhang, Hongsheng

doi:10.4271/2017-01-0847

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…In the traditional research related to fuel injection and atomization, spray and atomization quality is improved by increasing the injection pressure and reducing the diameter of the nozzle hole [2,3]. However, when blindly increasing the injection pressure, the penetration of the long spray tip is prone to adverse effects such as wall impingement and lubricating oil dilution [4,5]. Therefore, people have tried to use orifices with new structures, having different cross-section shapes, in order to improve the fuel atomization quality.…”

Section: Introductionmentioning

confidence: 99%

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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