Spray Characterization of Gasoline Direct Injection Sprays Under Fuel Injection Pressures up to 150 MPa with Different Nozzle Geometries

Yamaguchi, Akichika; Koopmans, Lucien; Helmantel, Arjan; Karr̈holm, F. Peng; Dahlander, Petter

doi:10.4271/2019-01-0063

Cited by 28 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, injection rate measurements and the phase doppler interferometry measurements were performed to obtain fuel mass flow rates and droplet size distributions at individual injection pressures, respectively. More details about the measurement configuration can be found in Yamaguchi et al (2019), Wadekar et al (2019).…”

Section: Particle Image Velocimetry Set-upmentioning

confidence: 99%

Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

Wadekar

Yamaguchi

Oevermann

2020

Flow Turbulence Combust

View full text Add to dashboard Cite

The development of gasoline spray at ultra-high injection pressures was analyzed using Large-Eddy simulation (LES). Two different nozzle hole geometries, divergent and convergent shape, were considered to inject the fuel at injection pressures ranging from 200 to 1500 bar inside a constant volume spray chamber maintained at atmospheric conditions. The discrete droplet phase was treated using a Lagrangian formulation together with the standard spray sub-models. The numerical results were calibrated by reproducing experimentally observed liquid penetration length and efforts were made to understand the influence of ultra-high injection pressures on the spray development. The calibrated model was then used to investigate the impact of ultra-high injection pressures on mean droplet size and droplet size distribution. In addition, the spray-induced large-scale eddies and entrainment rate were evaluated at different ultra-high injection pressures. Overall, simulation results showed a good agreement with available measurement data. At ultra-high injection pressures mean droplet sizes were significantly reduced and comprised very high velocities. Integral length scales of spray-induced turbulence and air entrainment rate into the spray were larger at higher injection pressure compared to lower ones. Graphic abstract

show abstract

Section: Particle Image Velocimetry Set-upmentioning

confidence: 99%

Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

Wadekar

Yamaguchi

Oevermann

2020

Flow Turbulence Combust

View full text Add to dashboard Cite

show abstract

“…Normally, increasing rail pressure and decreasing fuel temperature would result in increased liquid penetration, leading to more liquid area present in the viewing window. 21–23 Neither of these hold for the DI propane tests conducted in this study, which is likely due to the different operating regime propane is subject to relative to that of conventional fuels. Liquid propane is always visible at 4.5 MPa, although there is no obvious monotonic decrease in the mean liquid spray area with temperature.…”

Section: Resultsmentioning

confidence: 77%

Flash vaporization of propane in an optically accessible, directly injected engine

Lacey

Aditiya

Poursadegh

et al. 2019

International Journal of Engine Research

View full text Add to dashboard Cite

This article presents an experimental and thermodynamic analysis of the direct injection of propane in an optically accessible variant of a downsized production engine. Propane is used as a surrogate for liquefied petroleum gas and is tested at several fuel rail conditions. Imaging of the sprays’ structure is conducted using planar laser Mie scattering. A number of seemingly counter-intuitive trends relating to rail pressure and temperature are observed from the experiments, and thermodynamic investigation is conducted to explain these trends. It is concluded that flash-boiling induced vaporization external to the injector nozzle is largely responsible for the observed behavior, and a new quantity is proposed to describe the severity of this phenomenon.

show abstract

“…According to previous scientific studies, fuel injection at high pressure levels (up to 1500 bar) enhances both fuel evaporation and in-cylinder turbulence giving, at the end, a more stable combustion [8]. The injection pressure affects the breakup dynamics and droplet dimensions, as shown by Yamaguchi in an in-depth investigation on spray evolution [9]. In another work, spray penetration and breakup time of high-pressure sprays were related to literature correlations for diesel injections [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Numerical CFD Assessment of a Thermodynamic Breakup Model for Superheated Sprays with Injection Pressure up to 700 Bar

Duronio

Vita

Montanaro³

et al. 2023

Fluids

View full text Add to dashboard Cite

Among the most relevant fields of research recently investigated for improving the performance of gasoline direct injection (GDI) engines, there are ultrahigh injection pressures and the flash-boiling phenomenon. Both perform relevant roles in improving the air/fuel mixing process, reducing tailpipe emissions and implementing new combustion methods. When a high-temperature fuel is released into an environment with a pressure lower than the fuel’s saturation pressure, flash boiling occurs. Due to complex two-phase flow dynamics and quick droplet vaporization, flash boiling can significantly modify spray formation. Specifically, if properly controlled, flash boiling produces important benefits for the fuel–air mixture formation, the combustion quality and, in general, for overall engine operation. Flash boiling was broadly investigated for classical injection pressure, but few works concern ultrahigh injection pressure. Here, the investigation of the spray produced by a multihole injector was performed using both experimental imaging techniques and CFD simulations aiming to highlight the combined impact of the injection pressure and the flash boiling occurrence on the spray morphology. The shadowgraph method was employed to observe the spray experimentally. The information gathered allows for assessing the performances of an Eulerian–Lagrangian algorithm purposely developed. Breakup and evaporation models, appropriate for flashing sprays, were implemented in a CFD (Computational Fluid Dynamics) code. The experimental results and the CFD simulations demonstrate a good agreement, demonstrating that through adoption of a flash-boiling breakup model, it is possible to reproduce non-evaporating and superheated sprays while changing few simulation parameters. Finally, the results also show the significance of injection pressure in preventing spray collapse.

show abstract

Spray Characterization of Gasoline Direct Injection Sprays Under Fuel Injection Pressures up to 150 MPa with Different Nozzle Geometries

Cited by 28 publications

References 21 publications

Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

Flash vaporization of propane in an optically accessible, directly injected engine

Experimental Investigation and Numerical CFD Assessment of a Thermodynamic Breakup Model for Superheated Sprays with Injection Pressure up to 700 Bar

Contact Info

Product

Resources

About