Abstract
This research addresses a numerical analysis on the effects of flow compressibility on the characteristics of droplet dispersion, evaporation, and mixing of fuel and air according to the simulation of the spatially developing supersonic shear flows laden with evaporating n-decane droplets. A sixth-order hybrid WENO numerical scheme is employed for capturing the unsteady wave structures. The influence of inflow convective Mach number ( M c ), representing the high-speed flow compressibility, on the two-phase mixing is analyzed, in which M c is specified from 0.4 to 1.0. It is found that the shearing vortex is compressed spatially as M c increases, associated with the alternate distributions of compression and expansion regimes in the flow field. The flow compressibility changes not only the vortex structures but also the aerothermal parameters of the shear flows, and further influences the dispersion and evaporation of droplets. The two-phase mixing efficiency is observed to decrease as M c increases.
Highlights
Supersonic shear layer laden with dispersed fuel droplets is considered as the physical model for the supersonic c-based engine [1,2,3,4]
For the compressible shear layers, the flow compressibility is of importance for the flow dynamics, and the convective Mach number, Mc = ΔU/ða1 + a2Þ, characterizes the flow compressibility
The results showed that the growth rates of shear layer and mixing efficiency are reduced with the increase of Mc
Summary
Supersonic shear layer laden with dispersed fuel droplets is considered as the physical model for the supersonic c-based engine [1,2,3,4]. The unsteady entrainment due to the vortex dynamics promotes the fuel-oxidant mixing in supersonic shear flows. Brown and Roshko [5] first found that the unsteady vortices have coherent structures when they experimentally studied the incompressible shear layers. There are various sizes of flow structures in the shear layer. For the compressible shear layers, the flow compressibility is of importance for the flow dynamics, and the convective Mach number, Mc = ΔU/ða1 + a2Þ, characterizes the flow compressibility (where a1 and a2 are the sound velocity of two streams). There are parameters, such as density ratio of two shear flows, gradient of velocity and pressure, and heat release, which are found to have an effect on the dynamics of the shear layer
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