A Study of Near-Field Entrainment in Gas Jets and Sprays Under Diesel Conditions

Abstract

This paper presents a computational study of entrainment characteristics in the near-field of gas jets under atmospheric and Diesel conditions and sprays under Diesel conditions. Computed flowfield information is used to estimate the rate of mass entrainment in the jet and derive the entrainment rate constant. The value of the entrainment rate constant is compared to experimental results in the literature. It is found that the computed values of the constant in the near-field are less than the values in the self-similar region of the jet with the values increasing monotonically from the orifice to the self-similar region. These results are consistent with experimental results. In the case of sprays, it is found that it is difficult to arrive at firm conclusions because the results are sensitive to several parameters that are not well known and to the numerics. The computed results for sprays are also discussed relative to measurements in sprays quoted in the literature. [S0098-2202(00)00802-6]

Estimation of a suitable Schmidt number range in diesel sprays at high injection pressure

“…Influences of a non-flat profile have been studied by Post et al [46]. They show that, if two sprays have different radial profile shapes but the mass and axial momentum fluxes have the same value, the influence of the profile shape is confined to the initial region.…”

Study of mass and momentum transfer in diesel sprays based on X-ray mass distribution measurements and on a theoretical derivation

“…Influences of a non-flat profile have been studied by Post et al (2000). They show that, if the mass and axial momentum fluxes are the same, the influence of the profile shape is confined to the initial region.…”

A Spherical Volume Interaction DDM Approach for Diesel Spray Modeling

“…This choice may cause an inadequate resolution of the flow structures. Moreover, even when the basic hypothesis are fulfilled, results show strong dependencies on the choice of the grid structure and on the mutual orientation of the spray trajectory with respect to the grid (Abani et al (2007) and Post et al (2000)). This makes hard to define a best practice that is independent of the used grid to discretize the physical domain.…”