Numerical simulation of flow-field for shock induced axisymmetric fluidic vectoring nozzle

A sub-scaled numerical simulation employing RNG k-ε model was conducted to determine the internal flow-field structure of a shock induced axisymmetric fluidic vectoring nozzle with a slot in its divergent section, when the nozzle pressure ratio (NPR) was 3-10, and the flow flux ratio of the secondary flow injection to the primary flow (W_s/W_p) was 2.5%-20%. The results from comparison of computational and experimental data indicate that, the relative tolerance of wall static distribution is less than 10.1%. The flow-field structure is very complicated for the secondary flow injection. The flow structure is characterized in that, a pair of opposite revolving separated vortex exists in the divergent section and a large recirculation region locates between the secondary flow injection and the outlet. The flow field structure changes with NPR and W_s/W_p.