<p>Gasoline direct injection (GDI) is a promising solution to increase engine thermal efficiency and reduce exhaust gas emissions. The GDI operation requires an understanding of fuel penetration and droplet size, which can be investigated numerically. In the numerical simulation, primary and secondary breakup phenomena are studied by the Kelvin-Helmholtz/Rayleigh-Taylor (KH-RT) wave breakup models. The models were initially developed for diesel fuel injection, and in the present work, its usage is extended for the GDI application combined with large-eddy simulation (LES). The simulation is conducted using the KIVA4 code.</p><p>&nbsp;&nbsp; Measured data of experimental spray penetration and Mie-scattering image comparisons are carried out under non-reactive conditions at an ambient temperature of 613K and a density of 4.84 kg/m3. Comparison with traditional Reynolds-Averaged Navier-Stokes (RANS) calculation is also simulated. Grid size effects in the simulation using the LES and RANS models are also investigated to find a reasonable cell size for future reactive gasoline spray/combustion study. The fuel spray penetration and droplet size are dependent on specific parameters. Parametric studies on the effects of adjustable constants of the KH-RT models, such as time constants, size constants, and breakup length constant, are discussed. Liquid penetrations from the RANS turbulence model are similar to that of the LES turbulence model's prediction. However, the RANS model is not able to capture the spray structure well.</p>

Numerical Study on the Adaptation of Diesel Wave Breakup Model for Large-Eddy Simulation of Non-Reactive Gasoline Spray

Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2021/volume/85109

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