Abstract
The dual-fuel collision phenomenon is used to realize different concentrations and reactivity stratification in the dual direct injection technique. The present work developed a dual-fuel spray collision model in the computational framework of Eulerian-Lagrangian spray simulation by introducing an additional independent variable, the fuel fraction, to the droplet probability distribution function. This model was used to investigate the macroscopic and microscopic characteristics of n-butanol/biodiesel spray collision, for which experiments were also conducted for validation. Moreover, to investigate the influence of various fuel properties (fuel density, latent heat of evaporation, and vapor pressure) on the spray characteristics, a comprehensive parametric study was conducted. Results show that the simulation result shows a good agreement with the experiment data. As the n-butanol and biodiesel sprays collide, most droplets have a higher mass ratio of biodiesel. Larger SMD is linked to droplet coalescence. Among different fuel properties, the vapor pressure and latent heat of evaporation display a significant impact on the macroscopic characteristics (collision moment and liquid-phase penetration) and microscopic characteristics (droplet number percentage variation of different fuel fractions).
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