NUMERICAL-SIMULATION OF MIXING FOR TURBULENT SLOT INJECTION

Flowfields are simulated that are induced by sonic jets injected into supersonic airstreams. Results on structure and mixing of such jets ar e presented. Several two-dimensional cases are treated using a low-Rey nolds-number q-omega turbulence model. The influence of some turbulenc e modeling corrections and of artificial dissipation are investigated for Bat plate test cases where nitrogen is injected transversely into the supersonic airstream. The results demonstrate the necessity to use modeling corrections and to reduce artificial viscosity in near-wall regions. The numerical code is also used to calculate a similar transv erse helium injection into a ducted airstream. In a further investigat ion hydrogen is injected axially into the mainstream. In this case mix ing is strongly influenced by turbulent diffusion. Pressure and specie s profiles are compared with experimental data.