Computational Study of Shock Driven Multiphase Mixing in Scramjet Conditions

摘要

Using a multiphase 3D LES approach simulations were conducted to study the fundamentals of multiphase turbulent mixing in a scramjet combustor. These simulations studied the effects of particle distribution, acceleration history, and particle lag effects. Heterogeneous, clumped, particle distributions, as are produced by fuel nozzles, were explored to determine the effect of particle distribution on multiphase scramjet mixing. The heterogeneity of the particle distributions is varied by examining different clump densities and distributions while maintaining a constant particle size distribution and mass ratio. Evaporation rates, particle lag distances, vapor mixing, and enstrophy, are reported from these simulations. Overall evaporation rates were found to be low, with vapor mixing largely driven by the amount of heterogeneity in the particle distribution. Of the distributions studied all produced a similar droplet evaporation rate with dense clumps found to produce a less isotropic flow field with higher enstrophy and vapor mixing.