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Computational Study of Shock-Driven Multiphase Mixing in Scramjet Conditions

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Using a multiphase 3D large-eddy simulation 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. Heterogeneous, clumped, particle distributions, as produced by fuel injector nozzles, were explored to determine the effect of particle distribution on multiphase mixing in a scramjet engine environment. 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, new-vapor production rates were found to be low, with vapor mixing being largely driven by the heterogeneity of the particle distribution. The primary finding of this work is that more heterogeneous distributions of particles produce greater mixing of the particle vapor. This enhanced mixing results from particle lag and a greater deposition of enstrophy by gradients in particle mass fraction.