LIQUID FUEL FLAMELESS COMBUSTION RANS SIMULATION

摘要

The numerical simulation of flameless combustion with liquid fuels is presented. Computations follow a RANS approach for turbulence modeling with a global reaction mechanism and the eddy dissipation concept for the combustion. Several approaches were tested for defining spray boundary conditions. A phenomenolog-ical analysis of the two-phase mixing and heat transfer that follow the injection enabled us to derive the spray boundary conditions that would eventually lead to our main goal; the simulation of flameless combustion. Computation results are compared to experimental measurements. First the isothermal mean velocity field computation is validated using LDA measurements. Then, temperature and CO_2 radial-profiles at different axial positions and CO andNO_x concentration levels at the outlet are compared to experimental data. The effect of spray initial conditions, inlet temperature, mixture properties and chemistry are analyzed.