Numerical simulation of high-speed turbulent reacting coaxial jet flow using a structured grid

Reacting flowfields are described by compressible turbulent Reynolds-averaged Navier-Stokes equations augmented with appropriate species continuity equations that provide for the convection, diffusion and production of each chemical species. The closure of the system of equations is achieved using a two-equation turbulence model. A single-step overall fast chemical reaction combustion model based on the eddy break-up concept is employed for the turbulence-chemistry interaction. A finite volume discretization is carried out in spatial coordinates to compute inviscid and viscous flux vectors. A multistage Runge-Kutta time-stepping scheme is used to obtain a steady state solution. The numerical algorithm is developed by taking into consideration the structured grid arrangement for a turbulent chemically reacting coaxial jet. The numerical scheme is shown to be computationally fast, easy to program and efficient. A supersonic diffusion flame is analysed and the results are compared with the available experimental data.