Study of the gases’ temperature influence on gas–particle dynamics in a supersonic mixing layer

The supersonic particle-laden turbulent mixing layer is considered a promising method to enhance supersonic combustion in scramjet engine design. The injection of particles into the mixing flow is one way to improve fuel-oxidizer mixing and enhance the energy density of the fuel. In this paper, we continue our numerical study of the high-speed hydrogen and air mixing layer with solid particles using the Eulerian–Lagrangian approach. The quasi two-dimensional Navier–Stokes equations with the third-order essentially nonoscillatory (ENO) scheme are carried out. Ordinary differential equations of particles are solved with the explicit second-order Euler method. The basic purpose is to study the influence of gas temperatures on the flow and particle behavior. The result of particles heating around formed vortices in a mixing layer is presented for two options of the variation of temperatures at the entrance. In the first one, the upper hydrogen flow temperature is taken to be the same, while the temperature of the bottom airflow is changed. And, in the second case, on the contrary, the upper hydrogen flow temperature is varied. It is revealed that a decrease in the temperature in the vortex core due to the rapid turnover of a high-speed flow leads to a significant discrepancy in the distribution of maximum and minimum temperatures between the vortex core and its braid. This is what causes the wave-like shape of the particle temperatures in the mixing layer. In addition, particles are moved in the high-temperature airflow (on the periphery of the mixture layer) and are heated up very quickly.