4.4 Article

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

Journal

FLOW TURBULENCE AND COMBUSTION
Volume 107, Issue 1, Pages 149-174

Publisher

SPRINGER
DOI: 10.1007/s10494-020-00231-0

Keywords

Large-Eddy simulation; Gasoline spray; Ultra-high injection pressure; Spray-induced turbulence; Air-entrainment

Funding

  1. Chalmers University of Technology - Swedish Energy Agency [2015-011324]

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The study analyzed the development of gasoline spray at ultra-high injection pressures using Large-Eddy simulation (LES). Results indicated that at high injection pressures, the mean droplet sizes of the spray were significantly reduced with very high velocities, while the spray-induced large-scale eddies and air entrainment rate increased with higher injection pressures.
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.

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