MIXING AND COMBUSTION PHENOMENA IN SUPERSONIC FLOWS STUDIED BY CFD AND LASER DIAGNOSTICS

The fuel injection process perpendicular and axial to a supersonic pri mary air flow is investigated both experimentally and theoretically. T hese studies are related to the development of airbreathing propulsion concepts with supersonic combustion. Experiments are performed for a subscale mixing chamber where gaseous hydrogen is injected in front of a backward facing step. The experimental investigations include the m easurement of wall static pressure, schlieren photography to locate sh ock waves and Raman spectroscopy for the determination of hydrogen dis tributions. The experimental data are compared with numerical results. For solving the two-dimensional Navier-Stokes and species transport e quations an implicit LU-algorithm is used and chemistry is treated ful ly coupled with the fluid motion. For turbulence modeling a low-Reynol ds-number q-omega turbulence closure is employed.