A Lagrangian Model of Combustion in High-Speed Flows: Application to Scramjet Conditions

The present study is devoted to the computational modeling of non-premixed flames stabilization in high-velocity reactive flows where compressibility effects, turbulent mixing, and chemical kinetics processes are competing. The characterization of the unsteady features of such turbulent reactive flows is still a difficult task, from both experimental and numerical points of view, so that the evaluation of numerical models capabilities remains essentially performed through the comparisons of steady-state solutions with the corresponding experimental data. The Reynolds averaged Navier-Stokes (RANS) strategy still provides the most suitable framework to obtain such steady-state solutions for flows at a high Reynolds number, especially for design and optimization purposes. In turbulent non-premixed flames, the competition between molecular diffusion effects—namely, micromixing or scalar dissipation—and chemical kinetics must be taken into account. In the present work, a Lagrangian framework, able to represent...