Study on the turbulence and chemistry interaction on high enthalpy compression-expansion corner
In recent years,hypersonic vehicles have attracted extensive attention,with the Mach number of the aircraft increasing,the gas may dissociate in the high-temperature environment after the leading shock,and then form the complex interaction among strong shock waves,turbulent pulsation and non-equilibrium chemical reactions.This work chose the flow condition after the leading shock of a cone in hypersonic flight,and performed direct numerical simulation of high enthalpy shock wave/turbulent boundary layer interaction.The mean component distribution,turbulent pulsation and component pulsation distribution in boundary layer under the strong interaction are studied,and the distribution of turbulence and chemical reaction interaction intensity under strong shock wave is obtained by turbulence-chemistry interaction coefficient.The results show that the high enthalpy flow has a small separation,the average temperature and density in the separation zone increase,the gas dissociation is intensified,and the average mass fraction of O and N components increases significantly compared with the incoming boundary layer.The mass fraction pulsation of O and N components in the interaction area is obviously enhanced,but it is slightly different from the distribution of turbulent kinetic energy.The region with the strongest Turbulence-Reaction Interaction is highly coincident with the region of turbulent kinetic energy maximum,while it is quite different from the region of maximum component average and pulsation.
hypersonicshock wave/boundary layer interactionturbulence-chemistry interactionnon-equilibrium chemical reactionsdirect numerical simulation
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